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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104557
Title The analysis of bunch production in the oil palm
show extra info.
door L.D. Sparnaaij
Author(s) Sparnaaij, L.D.
Publisher Wageningen : [s.n.]
Publication year 1959
Description 82 p ill
Notes Proefschrift Wageningen
Tutors Coolhaas, Prof. Dr. Ir. C.
Graduation date 1959-12-18
Dissertation no. 272
Author abstract show abstract
Bunch yield of oil palms can be expressed as the product of number of bunches and average bunch weight. Number of bunches is itself composite, being determined by number of leaves, percentage floral abortion, sex ratio and percentage bunch failure. Of these elements sex ratio proved to be most strongly influenced by age, environment and genetic constitution.

Detailed data from a number of cultural experiments on the effects of intercropping, cultivation, manuring and pruning were used to study the effects of various treatments on individual components of yield. The clear response of sex ratio to cultural treatments could be traced to a positive correlation with light intensity and a negative correlation with total nitrogen in soil, in particular during periods of insufficient sunlight. These findings led to the hypothesis that environment affects sex ratio and therefore bunch number, through the ratio between carbohydrate assimilation and nitrogen uptake.

Yield analysis thus facilitated the interpretation of the results of agronomic trials, particularly in Africa where yields were often limited through insufficient sunlight. In breeding of oil palms, yield analysis could enable the plant breeder to estimate the performance of his material under different conditions and could reveal the interactions between sex ratio, fruit quality and sterility.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,272
Keyword(s) (cab) elaeis guineensis / oil palms / botany
Categories Oil Palms
Publication type PhD thesis
Language English
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