Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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The Economics of Biofuel Policies. Impacts on Price Volatility in Grain and Oilseed Markets
Gorter, H. de; Drabik, D. - \ 2015
New York (USA) : Palgrave Macmillan (Palgrave studies in agricultural economics and food policy ) - ISBN 9781137414847
agrarische economie - milieubeleid - biobrandstoffen - bio-energie - biomassa - energie - voedselprijzen - basisproducten - ethanolproductie - suikerriet - vluchtigheid - landbouwprijzen - agricultural economics - environmental policy - biofuels - bioenergy - biomass - energy - food prices - commodities - ethanol production - sugarcane - volatility - agricultural prices
The global food crises of 2008 and 2010 and the increased price volatility revolve around biofuels policies and their interaction with each other, farm policies and between countries. The Economics of Biofuel Policies focuses on the role of biofuel policies in creating turmoil in the world grains and oilseed markets since 2006. This book puts together theory and empirical evidence of how biofuel policies created a link between crop (food grains and oilseeds) and biofuel (ethanol and biodiesel) prices. This combined with biofuel policies role in affecting the link between biofuels and energy (gasoline, diesel and crude oil) prices will form the basis to show how alternative US, EU, and Brazilian biofuel policies have immense impacts on the level and volatility of food grain and oilseed prices.
Pretreatment of lignocellulose for biotechnological production of lactic acid
Harmsen, P.F.H. ; Lips, S.J.J. ; Bakker, R.R.C. - \ 2013
Wageningen UR FBR (Rapport / Wageningen UR Food & Biobased Research 1384, public version) - ISBN 9789461736079 - 104
voorbehandeling - biomassaconversie - lignocellulose - melkzuur - bioproceskunde - technologie - suikerriet - kosten - kostenanalyse - biobased economy - pretreatment - biomass conversion - lactic acid - bioprocess engineering - technology - sugarcane - costs - cost analysis
The breakdown of biomass in pretreatment facilitates enzymatic hydrolysis by disrupting cell wall structures, driving lignin into solution or modification of the lignin structure, and reducing cellulose crystallinity and chain length, while preventing hydrolysis of cellulose. In an ideal situation the pretreatment leads to high yields of fermentable sugars with a limited formation of degradation products that inhibit enzymatic hydrolysis and fermentation to lactic acid, while remaining cost effective. This review deals with these challenges by providing information on available pretreatment technologies in general (chapter 3), and more specific on pretreatment of the model feedstock sugarcane bagasse (chapter 4). Techno economic studies are described in chapter 5 with the NREL study from 2011 as benchmark. This review starts with characteristics of lignocellulosic biomass in relation to compostion and formation of inhibitors.
Islands of dairy in a sea of sugarcane: the future of family dairy farming in Brazil
Monteiro Novo, A.L. - \ 2012
University. Promotor(en): Ken Giller, co-promotor(en): Maja Slingerland; Kees Jansen. - S.l. : s.n. - ISBN 9789461733696 - 141
bedrijfssystemen - suikerriet - melkveehouderij - kleine landbouwbedrijven - intensivering - brazilië - sao paulo - farming systems - sugarcane - dairy farming - small farms - intensification - brazil

The future of family farming is a matter of debate, especially because of the far-reaching economic and political changes that are occurring. One vision is that family farms will disappear because they are less efficient than large-scale industrial farming enterprises. Others foresee that they will survive, due to their ability to resist external forces and adapt their internal processes. The recent increase in worldwide demand for biofuels is changing economic and social relationships in many rural areas by creating potentially competing claims on natural resources. The huge Brazilian sugarcane industry, one of the most efficient in the world, has expanded enormously, replacing pastures. This thesis studies the (differential) impact that the increasing area of sugarcane has had on family dairy farmers in São Paulo state and the various drivers at different levels that influence land use and, therefore, the future of these farmers. Historical changes in land use, production technologies, and product and land prices are described, together with how these are linked to changing policies in Brazil. The study analyses how dairy farmers, with different rationales and resource endowments, react to the increased competition from sugarcane for land and labour. It shows that farmers have different options and strategies when considering leasing their land for sugarcane production. It also looks at local responses and alternatives to this trend and has found that intensifying small-scale dairy production holds potential for increasing the income and quality of life of small-scale farming households.

The research reveals that the increasing competition between milk production and sugarcane is not only the result of long-term governmental policies that support the expansion of the sugarcane business. It is also related to the internal dynamics of the dairy and beef chains. In the Brazilian case, different drivers (at different scales) have played an important role in the replacement of pastures by sugarcane. One factor is the ever-expanding milk frontier, which has been driven by technological innovations (e.g. UHT milk). Other factors include the price fluctuations in raw milk and beef that occurred after deregulation and the concentration that has occurred in the dairy industry and the retail sector. The study concludes that the expansion of sugarcane needs to be understood in the context of the dynamics of other agricultural sectors and the long-term national political economy rather than being seen solely as the result of recent increases in global demand for biofuel.

At the farm level, the study identified a more complex set of interactions than merely a competition between sugarcane and dairy farming. The comparison of different farm types reveals that labour availability, household resilience and technology introduction are the key factors influencing farmers’ decisions. The proximity of cities that offer more attractive jobs and provide schooling opportunities for farmers’ children is largely responsible for the labour shortages in family dairy farming. The effects of sugarcane expansion are contradictory and uneven according to the different strategies and resource endowments of farmers. Leasing land to sugarcane may be attractive to farmers as it reduces labour load and risk while guaranteeing a monthly income. On the other hand, farmers who abandon dairy production and totally rent to sugarcane may be entering a ‘one way street’: once the infrastructure is dismantled, they cannot return to their former business. Nevertheless, when only part of the land is rented to sugarcane as a form of diversification, this can offer a guaranteed extra income, fitting the rationale of resilience, lowering risks and uncertainties, and providing resources for investing in intensification. Neither option is feasible for very small farms due to the size of their operation.

This thesis went on to examine the option of dairy intensification as promoted by the Balde Cheio programme. The study of this programme provides insights into the interactions between technology, innovation and family farmers’ needs. It looks at a sample of farmers who joined the Balde Cheio programme and attained high land productivity, equivalent to that observed in developed countries that employ more intense, sophisticated and highly specialized production systems. The higher productivity was due to a combination of more lactating cows per unit area (31%), higher productivity per cow (24%) and better labour performance (37%) while using less land area (-7%). The gross margin per unit area almost doubled even though milk prices only increased by 7%. This was achieved through having a large number of lactating cows per unit area as a result of strategies that make use of the high potential for dry matter production of tropical grasses, (rather than through achieving extremely high productivity per cow - a typical strategy of non-grazing systems). These intensified milk production systems yielded an average of R$ 3,000/ha, which is highly competitive with R00/ha for sugarcane leasing and R00/ha for soybean production. The average values in terms of income per family member were also very competitive in comparison to average urban wages.

This research continued by analysing how such changes in the productive processes took place at the level of the family dairy farm. The examination of the internal dynamics of the Balde Cheio programme reveals several lessons for family farmer oriented research, development and extension. For example, it shows that it is possible to attain high levels of productivity and outstanding economic results without expensive ‘cutting-edge’ technologies but with an intense circulation of different forms of knowledge and skills supported by institutional arrangements, intense networking among different types of actors and the flexible application of relatively simple techniques. Other processes applied included trialling/experimenting under real farming conditions and adjusting to the farmer’s rhythm of innovation. These processes have narrowed the gap between ‘the scientific frontier’ – the advanced research orientation of the governmental research institutes – and the realities experienced by small dairy farming systems. The results show that, despite the increasing opportunity costs for land and labour and competition for local resources (created by other commodity chains and the attraction of urban areas), it is still possible for family dairy farmers to be competitive if they are supported to sustainably intensify their production processes.

Growing Sugarcane for Bioenergy – Effects on the Soil
Hartemink, A.E. - \ 2010
In: Proceedings 19th World Congress of Soil Science, Brisbane, Australia, 01 - 06 August, 2010. - - p. 13 - 15.
suikerriet - bodemdegradatie - verzuring - brandstofgewassen - uitspoelen - verliezen uit de bodem - verontreiniging - biobased economy - sugarcane - soil degradation - acidification - fuel crops - leaching - losses from soil - pollution
An increasing area of sugarcane is being growing for the production of bioenergy. Sugarcane puts a high demands on the soil due to the use of heavy machinery and because large amounts of nutrients are removed with the harvest. Biocides and inorganic fertilizers introduces risks of groundwater contamination, eutrophication of surface waters, soil pollution and acidification. This paper reviews the effect of commercial sugarcane production on soil chemical, physical and biological properties using data from the main producing areas. Although variation is considerable, soil organic C decreased in most soils under sugarcane and, also, soil acidification is common as a result of the use of N fertilizers. Increased bulk densities, lower water infiltration rates and lower aggregate stability occur in mechanized systems. There is some evidence for high leaching losses of fertilizer nutrients as well as herbicides and pesticides. Eutrophication of surface waters occurs in high-input systems. Sugarcane cultivation can substantially contribute to the supply of renewable energy, but that improved crop husbandry and precision farming principles are needed to sustain and improve the resource base on which production depends.
Lignocellulosic ethanol in Brazil : technical assessment of 1st and 2nd generation sugarcane ethanol in a Brazilian setting
Stojanovic, M. ; Bakker, R.R.C. - \ 2009
Wageningen : Agrotechnology and Food Innovations - 18
suikerriet - ethanol - lignocellulose - sucrose - fermentatie - technologie - brazilië - bioethanol - biobrandstoffen - sugarcane - fermentation - technology - brazil - biofuels
Brazil is currently the largest ethanol-biofuel producer worldwide. Ethanol is produced by fermenting the sucrose part of the sugarcane that contains only one third of the sugarcane energy. The rest of the plant is burned to produce energy to run the process and to generate electricity that is sold to the public grid, making the process a net energy producer. This paper evaluates current technology from an energy efficiency point of view and quantifies additional benefits from extra energy generated in during sugarcane processing.
Sugarcane ethanol: contributions to climate change mitigation and the environment
Zuurbier, P.J.P. ; Vooren, J.G. van de - \ 2008
Wageningen : Wageningen Academic Publishers - ISBN 9789086860906 - 255
milieubeleid - klimaatverandering - suiker - suikerriet - milieu - ethanol - landgebruik - landbouwproductie - duurzaamheid (sustainability) - transport - economische impact - milieueconomie - bioethanol - biobased economy - biobrandstoffen - environmental policy - climatic change - sugar - sugarcane - environment - land use - agricultural production - sustainability - economic impact - environmental economics - biofuels
Climate change is a challenge facing human life. It will change mobility and asks for new energy solutions. Bioenergy has gained increased attention as an alternative to fossil fuels. Energy based on renewable sources may offer part of the solution. Bio ethanol based on sugar cane offers advantages to people, the environment and the economy. Not surprisingly, governments currently enact powerful incentives for the development and exploitation of bio ethanol. However, every inch we come closer to this achievement, evokes more skepticism. Many questions are raised relating to whether sugar cane is really a sustainable solution. Still much is unknown about the net release of carbon dioxide and what the impacts of sugar cane expansion are on green house gas emissions. This book looks at the scientific base of the debate on sugar cane bioethanol. Authors from Europe, Brazil and the USA capture many aspects of what is known and address assumptions while not denying that still much is unknown. It covers impacts on climate change, land use, sustainability and market demands. This publication discusses public policy impacts, technology developments, the fuel-food dilemma and the millennium development goals.
Raising cane : linkages, organizations and negotiations in Malang's sugar industry, East Java
Hartveld, A.J. - \ 1996
Agricultural University. Promotor(en): N.E. Long; F. Huskens. - S.l. : Hartveld - ISBN 9789051665468 - 331
saccharum officinarum - suikerriet - economische groei - landbouw - productie - technologie - technische vooruitgang - productiestructuur - agrarische structuur - java - sugarcane - economic growth - agriculture - production - technology - technical progress - production structure - agricultural structure
<br/>The linkages between the Javanese sugar industry and the village communities have drawn the attention of both historians and social scientists. The formal organization of these linkages has changed drastically since Indonesia's independence; from plantation into outgrowers production contract systems. The Indonesian government nowadays regulates the sugar markets and the tripartite institutional structure, coordinating activities between the outgrowers' organizations and the mills, under directives of the district government.<p>This study, based on field data collected during the 1990/1991 cane growing season, is a sociology of economic life, dealing with organizational changes in the agro-industrial linkages in the sugar sector in one particular region. The first section of the book describes the longterm changes in the organizational structure of the sugar industry, both on the national and regional levels. The book then discusses the current organization of cane production and local-level marketing. The results of three village studies from different agro-ecological zones are presented in the second section. The book finally gives a comparative analysis of the organization of cane production and the patterns of interaction in the different agro-ecological zones. This comparison is related to an analysis of the interactions between actors with differing interests in the institutions and informal networks that form Malang's sugar production system at the supra-local level.
The political organization of sugarcane production in Western Mexico
Guzman - Flores, E. - \ 1995
Agricultural University. Promotor(en): N.E. Long. - S.l. : Guzman-Flores - ISBN 9789054853459 - 248
saccharum officinarum - suikerriet - landbouwbeleid - groene revolutie - economie - mexico - sugarcane - agricultural policy - green revolution - economics
<p>The strike of CNC sugarcane producers and the immediate response by the refinery administration are a good example of the ongoing political negotiations between the main actors involved in the organization of sugarcane production in the Valley of Autlán-El Grullo. I introduced in Chapter I the protagonists of sugarcane production participating in the social drama of confrontation and negotiation. I have described in Chapters 3, 4 and 5 the socio-economic conditions in which local peasants and farmers have evolved their decision to grow sugarcane. These social actors disclosed a wide range of skills and acute understanding of social institutions. This holds true among all producers from the smallest to the largest. The ways in which these different actors have got involved in sugarcane production defy the images of powerless reactive peasants and farmers that abound in the social analyses on Mexico.<p>Sugarcane producers in the valley successfully lobbied the Mexican Government to attract public investment into the region, which arrived as a sugar refinery with the financial resources to build access roads and improve the conditions of the irrigation canals which had been neglected. The reconstruction of how these peasants and farmers brought to the region public investment to build a refinery and how they have developed, with the encouragement of the refinery, their own organizations to deal with the refinery administration, was covered in Chapter 6. In Chapter 7, the last chapter, I have closed the circle with a description of a negotiation between producers and refinery administration which reached a satisfactory agreement to all parts involved, this negotiation highlights the shifting alliances and interests among participants.<p>The methodological approach to the subjects of study was a down-up actor- oriented approach. Although I would not claim I was a <em>tabula rasa</em> when I started the research I would certainly emphasise that this approach allowed me to immerse myself in the different individual perspectives which were, in spite of their contradictions, complementary to grasp the ethos of the organization of sugarcane production in the region. The individual cases illustrated their complex structuring of institutional arrangements. As North (1993) describes, individual decision-making follows guides provided by the institutions which shape human interaction in historically contexts. These structures provide social actors with incentives and guidance in the political, social and economic arenas which they apply and develop in their organizations. Sugarcane producers assume institutional constrains to diminish the uncertainty in their everyday life. On the one hand their participation in local economic and political organizations have repercussions beyond their region as on the other the national organizations impinge on their activities. My study has focused on the ways how these different levels of political and economic organization at national and local level are brought together by the social actors involved in sugarcane production.<p>Some of these local peasants and farmers participated in the initial negotiations to bring the refinery into the valley, others had to be lured to grow sugarcane. Their decision-making, in contrast with sugarcane producers in other regions, was based on the pursue of their own interest. As I described in Chapter 2, this was possible because they could make their decision when the state direct intervention in sugarcane production was trying to boost a steady supply of sugar for the domestic market; after several private refinery owners had gone into bankruptcy precipitating the crisis of sugar production at the end of the 1960s (Purcell, 1981: 224-225). These national conditions provided local peasants and farmers with room for manoeuvre. They could join forces with sugarcane producers in other regions and ask for better terms of production. Thus, they did not have to overturn archaic structures of exploitation as sugarcane producers in other regions in Mexico did (see Ronfeldt, 1975). These conditions were propitious for an organization of production where all the parts involved may have an equal participation. However, these propitious conditions only provide the institutional arena where social actors have to negotiate and implement the agreed plans for the organization of production. In other regions, sugarcane producers have not been able to seize as much control over production as the producers in the Valley of Autlán-El Grullo.<p>The possible explanations to the type of organization of production agreed by sugarcane producers and refinery administrators in the valley have to be extracted from the specific historical conditions in which these social actors were immersed and how they not only rely on the hegemonic social, economic and political institutions but transform them to fulfil their need and aspirations. In the case of local peasants and farmers, they have learned how to deal with the dominant political party, which pervades in a corporatist way the negotiations between the governmental institutions and the civil society (see Jessop, 1990). Each local peasant or farmer has found a way to deal with the refinery employees. As I discussed in Chapter 7, the refinery administrators have a different agenda to the producers, they look up to the national echelons of public administration, which is their line of command and where they would like to secure a place. These administrators have to reconcile the producers' demands with the national policies they have to implement and their careers, which is an extremely difficult task.<p>However all parts involved in the organization of production seemed to have been able to work out a <em>modus</em><em>vivendi</em> where they have conciliated their differences and run efficiently the organization of production in the Valley of Autlán-EI Grullo, which made the refinery Melchor Ocampo one of the most efficient in the country. As it was transparent in most comments, this was not achieved easily but the results have been worthwhile the effort. And these results provide an example of a successful cooperation between public administrators and local producers.<p>The sound financial record and good level of productivity made this refinery an attractive investment when the privatising wave reached the sugar refineries in the early 1990s. As it could have been expected, the Ingenio Melchor Ocampo was one of the first refineries to be sold to CNC. How this change of ownership has affected all parts involved in the organization of sugarcane production in the valley must be assessed in a re-study.
Upenja sugar project Zanzibar : detailed soil survey
Jordens, E.R. - \ 1984
Wageningen : Stichting voor Bodemkartering Wageningen (Rapport / Stichting voor Bodemkartering 1811) - 84
grondvermogen - landevaluatie - kaarten - saccharum officinarum - bodemgeschiktheid - bodemkarteringen - suikerriet - zanzibar - land capability - land evaluation - maps - soil suitability - soil surveys - sugarcane
Variability in the occurrence of the sugar cane froghopper, Aeneolamia flavilatera (Homoptera: Cercopidae), on sugar estates in Guyana and Surinam
Wiedijk, F. - \ 1982
Landbouwhogeschool Wageningen. Promotor(en): J. de Wilde, co-promotor(en): J.B.M. van Dinther. - Wageningen : Wiedijk - 60
insecten - plantenplagen - saccharum officinarum - suikerriet - cercopoidea - dieren - populatiedichtheid - populatie-ecologie - mortaliteit - populatiegroei - guyana - suriname - insects - plant pests - sugarcane - animals - population density - population ecology - mortality - population growth
<p/>Significant numbers of the sugar cane froghopper, <em>Aeneolamia flavilatera,</em> are generally not found to be present on sugar cane during the periodically occurring prolonged dry periods. This is primarily attributable to drought induced quiescence in the froghopper eggs, which delays the appearence of the next generation of active froghopper stages. It appears that the density of the post-drought populations of active froghopper stages is primarily dependent on the density of the pre-drought, quiescence sensitive egg populations. Effective froghopper control depends on the timely control of the first generation of post-drought active stages, because of the potentially rapid build-up of the froghopper infestation during prolonged rainy periods through a combination of relatively high reproduction capacity and wind accelerated adult dispersal. Control of the first generation of post-drought populations of the active stages should be based on a field by field prognosis through the interpretation of regularly updated field records of the approximate density of the active froghopper stages. The spatial distribution of froghopper infestations within one sugar estate can be influenced markedly by 'block-wise' harvesting. This in turn allows the potential effectiveness and efficiency of froghopper control measures to be greatly enhanced.
Wateravailability for sugar - cane in South - Nyanza
Kluyfhout, H. - \ 1978
Wageningen : Wageningen Agricultural University (Preliminary report / Training project in pedology Kisii, Kenya 29) - 55
beschikbaar bodemwater - gewassen - kenya - saccharum officinarum - suikerriet - waterbehoefte - verwelkingspunt - available water - crops - sugarcane - water requirements - wilting point
Semi-detailed soil survey of an area near Oyani Market, and the suitability of this area for the growth of sugarcane
O'Herne, E. - \ 1977
Wageningen : Landbouwuniversiteit Wageningen (Report Agricultural University, Department of Soil Science and Geology ) - 12
kenya - grondvermogen - landevaluatie - kaarten - saccharum officinarum - bodemgeschiktheid - bodemkarteringen - suikerriet - land capability - land evaluation - maps - soil suitability - soil surveys - sugarcane
Landbouw en suikerbietteelt op Cuba
Anonymous, - \ 1974
Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 3631)
landbouw - saccharum officinarum - suikerriet - cuba - bibliografieën - agriculture - sugarcane - bibliographies
De invloed van overstromingen op de suikerrietcultuur
Anonymous, - \ 1972
Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 3363)
bibliografieën - oogstschade - inundatie - overstromingen - plantenziekten - afwijkingen, planten - plantenziektekunde - plantenplagen - gewasbescherming - oppervlakkige afvoer - saccharum officinarum - bodemwater - suikerriet - bibliographies - crop damage - flooding - floods - plant diseases - plant disorders - plant pathology - plant pests - plant protection - runoff - soil water - sugarcane
Nature and assessment of losses caused by sugarcane borers
Ruinard, J. - \ 1971
Paramaribo : [s.n.] (Celos bulletins no. 15) - 9
plantenziekten - afwijkingen, planten - plantenziektekunde - plantenplagen - gewasbescherming - saccharum officinarum - suikerriet - plant diseases - plant disorders - plant pathology - plant pests - plant protection - sugarcane
testen van de Celos waterrem en het bepalen van het aftakasvermogen en het branstofverbruik van de landbouwtrekker MF-165 Mark 3; Vergelijkende proef met een schaar- en een schijvenploeg alsmede een beschrijveg met het doel meetapparatuur te testen; Verdichtings-, ruwheids- en relie͏̈fmetingen bij het rijden met een wieltrekker en een rupstrekker over de geoogste suikerrietpercelen; onderzoek naar de mogelijkheden van het mechanisch transporteren van suikerriet vanaf het veld naar de wagon
Jacobi, B. - \ 1969
Paramaribo : Centrum voor Landbouwkundig Onderzoek in Suriname (Celos rapporten no. 18)
landbouwkundig onderzoek - onderzoeksprojecten - suriname - suikerriet - mechanisatie - landbouwwerktuigen - trekkers - mechanische eigenschappen - schijfploegen - grondbewerking - rupstrekkers - transport - agricultural research - research projects - sugarcane - mechanization - farm machinery - tractors - mechanical properties - disc ploughs - tillage - track laying tractors
Bestand met verslagen van vier onderzoeksprojecten uitgevoerd door centrum voor landbouwkundig onderzoek in Suriname. De onderzoeken hebben betrekking op mechanische landbouwwerktuigen. In twee projecten worden landbouwwerktuigen getest. De andere twee projecten kijken specifieker naar het oogsten van suikerriet.
Schade door boorders aan suikerriet
Anonymous, - \ 1969
Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 3126)
bibliografieën - plantenziekten - afwijkingen, planten - plantenziektekunde - plantenplagen - gewasbescherming - saccharum officinarum - suikerriet - bibliographies - plant diseases - plant disorders - plant pathology - plant pests - plant protection - sugarcane
Riet - Bietsuiker
Anonymous, - \ 1968
Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 3028)
beta vulgaris - bibliografieën - saccharum officinarum - suikerindustrie - suikerbieten - suikerriet - bibliographies - sugar industry - sugarbeet - sugarcane
Rietsuikercultuur op Java, sociaal - economisch
Anonymous, - \ 1968
Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 2977)
bibliografieën - indonesië - saccharum officinarum - sociale wetenschappen - suikerriet - java - bibliographies - indonesia - social sciences - sugarcane
De minerale samenstelling van het blad van suikerriet speciaal wat betreft Mg en Mn
Anonymous, - \ 1967
Wageningen : [s.n.] (Literatuurlijst / Centrum voor landbouwpublikaties en landbouwdocumentatie no. 2816)
bibliografieën - plantkunde - saccharum officinarum - suikerriet - magnesium - mangaan - bibliographies - botany - sugarcane - manganese
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