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Original Articles

K‐Fertilization under different Agroecological conditions studied with maize

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Pages 399-407 | Published online: 15 Dec 2008
 

Abstract

In Hungary the AL‐method using ammonium lactate acetic acid as extradants has been widely used for serial analysis of soil potassium and phosphorous available to plants in the last 30 y. Because of the considerable increase of the price of fertilizers and decline of the economic situation, there is a pressing need for cost‐effective fertilizer use. Recently this highlighted the importance of nutrient recommendations based on soil analyses. Small plot long‐term field fertilization experiments are the best means to quantify the efFect or the efficiency of K‐fertilization. Long‐term data sets can reveal on which soil type which crop responds most favourably to the different fertilizer doses and nutrient ratios under different, long‐term balanced soil nutrient levels. Since the experimental data of the National Long‐Term Field Trials reflect the agro‐ecological conditions of nine experimental sites representing different soil types of Hungary, these experiments provide excellent opportunity to study this topic. The trials were set up in 1967 with 20 fertilization treatments including three increasing N‐and P‐levels each, two K‐levels and their different combinations. From the experimental data of great number only those of four sites will be shown. Winter wheat, maize, and pea have been grown as test plants. In the experiment selected for presentation, maize had statistically proved responses to K‐fertilization. The efficiency of K‐fertilizer on different soil types shows, however, significant differences, which can not be completely explained with the results of K‐analysis gained with the AL‐method.

In Ungarn wurde in den letzten 30 Jahren weitgehend die AL‐Methode zur Bestimmung des pflanzenverfügbaren K und P im Boden angewendet. Wegen der gegenwärtig ungünstigen ökonomischen Situation in Ungarn haben die Düngungsempfehlungen auf der Basis von Bodenuntersuchungen an Bedeutung gewonnen. Kleinparzellenversuche sind sehr geeignet um die Effektivität der IC‐Düngung in Abhängigkeit von Standortbedingungen zu untersuchen. Die nationale Dauerfeldversuchsserie repräsentiert die agroökologisclien Bedingungen von neun verschiedenen Standorten mit unterschiedlichen Bodentypen. Die Versuche wurden 1967 mit 20 Düngungsvarianten, 3 N, 3 P‐ und 2 K‐Stufen in orthogonaler Kombination und einer Nullvariante angelegt. Winterweizen, Mais und Erbsen wurden als Testpflanzen verwendet. Es werden die Ergebnisse von 4 Standorten mitgeteilt. Mais zeigte signifikante Reaktionen auf die K‐Düngung. Die signifikanten Unterschiede in der Effektivität der K‐Düngung auf den verschiedenen Bodentypen konnten noch nicht vollständig mit den Ergebnissen der K‐Analyse mittels AL‐Methiode aufgeklärt werden.

Notes

Corresponding author

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