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Konstgödselspridningens kvalitetsaspekt

en studie av sambandet mellan variationer i gödselintensitet och medelavkastning vid kvävegödsling av vete - metoder och modeller

Bergström, Tommy (1987). Konstgödselspridningens kvalitetsaspekt. Technical Report. Uppsala: (NL, NJ) > Dept. of Energy and Technology, Sveriges lantbruksuniversitet. Rapport - Sveriges lantbruksuniversitet, Institutionen för lantbruksteknik ; 113
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Abstract

The aim of the project was to find methods and models suitable for describing and/or quantifying - the characteristics of unevenness in fertilizer intensity - any net effect of the characteristics of the fertilizer unevenness. Non-uniform distribution of nitrogen fertilizer was simulated on wheat. The distribution pattern was simulated by defined systematic unevenness in a transverse direction to the direction of sowing. Totally 3312 sown rows after each seed coulter with a length of 3 meters were individually harvested during 1979-1982. The uptake of nutrient was found to be extremely local but the indirect effect of the influence has a wider range. The interaction between plants gives the crop a ’strategy’ to best benefit from placed nutrient. This strategy, however, does not always seem to result in maximizing the quantity of the yield. The studies show that yield depression may be related to the variability of fertilizer intensity. The variability within a relevant locality influencing the growth of a single plant can be expressed by a variance and an autocorrelation function. A description is given of how yield depression can be predicted and how parameters for predicting yield depression can be estimated by non-uniform distribution patterns. Different methods of analyzing the dependence between neighbouring plots were tested. A moving average and a nearest neighbour technique of analyzing the data were used. A proposed method of field-testing fertilizer distributors is to randomly position trays on the field to be fertilized. The trays should be divided into at least two halves or parts to give a measure of the auto-correlation between neighbouring miniplots. Assuming different types of systematic pattern, the auto-correlation function valid within a relevant distance can be estimated.

Authors/Creators:Bergström, Tommy
Title:Konstgödselspridningens kvalitetsaspekt
Subtitle:en studie av sambandet mellan variationer i gödselintensitet och medelavkastning vid kvävegödsling av vete - metoder och modeller
Series/Journal:Rapport - Sveriges lantbruksuniversitet, Institutionen för lantbruksteknik (0283-0086)
Year of publishing :1987
Number:113
Number of Pages:154
Place of Publication:Uppsala
Publisher:Institutionen för lantbruksteknik, Sveriges lantbruksuniversitet
ISSN:0283-0086
Language:Swedish
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
Keywords:effect of unevenness, estimation methods, prediction models
URN:NBN:urn:nbn:se:slu:epsilon-12-7
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-12-7
ID Code:4114
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: Erica Lövgren
Deposited On:23 Nov 2009 00:00
Metadata Last Modified:02 Dec 2014 10:27

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