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.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525534
Title Een onderzoek over de stroomruggronden van de Bommelerwaard met als proefgewas de aardappel
Author(s) Ferrari, T.J.
Source University. Promotor(en): A.C. Schuffelen; N.H. Kuiper. - 's-Gravenhage : Staatsdrukkerij - 132
Publication type Dissertation, internally prepared
Publication year 1952
Keyword(s) solanum tuberosum - aardappelen - zware kleigronden - bodemkarteringen - kaarten - nederland - bommelerwaard - gelderland - potatoes - clay soils - soil surveys - maps - netherlands
Categories Soil Fertility / Potatoes / Soil Science (General)
Abstract In agricultural research many factors have to be studied simultaneously to clarify a problem. The usual field trial with interference is not usable for this purpose. It is difficult or expensive to investigate the influence of factors, which are difficult or impossible to change, such as watertable, structure and clay content.

The method proposed avoided normal field trials with interference and used single plots distributed over a wide area. Natural variation in factors was used without interference. A graphic method of regression analysis, multifactorial analysis (Du. polyfactor analyse), was used to distinguish the influences of all growth factors. A method of testing the reliability of the results was worked out.

A trial with potatoes demonstrated the method. About 88 % of the explainable yield variance could be explained by nine factors: date of planting, distance to farmstead, acidity, K content, K dressing, content of organic matter, clay content, watertable and depth of reduction. This makes it plausible that important factors have not been neglected. The correlation coefficient between calculated and actual yields was 0.86.

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