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Einfluß der N‐Düngung auf Ertragsentwicklung landwirtschaftlicher Kulturen und Veränderung des mineralischen N‐Gehaltes im Boden bei achtjährigen Dauerversuchen
Author(s) -
Knittel H.,
Zerulla W.
Publication year - 1987
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1987.tb00097.x
Subject(s) - sugar beet , agronomy , fertilizer , nitrogen balance , nitrogen , nitrogen fertilizer , winter wheat , zoology , chemistry , biology , organic chemistry
Influence of long‐time Nitrogen‐fertilizing on yield response of agricultural crops and mineralized Nitrogen in soil In the years 1979–1986 a fertilizer trial with increasing Nitrogen amount was performed in order to prove the N min ‐method according to S charpf and W ehrmann . The N min ‐method regards the mineralized N in soil (N min ) for optimizing the N‐fertilizer amount at the begin of vegetation, could be confirmed. The optimal N‐rate (including N min ) was for winter wheat and winter barley 120 kg/ha, winter rye 100 kg/ha and sugar beet 200 kg/ha. For cereals additional N‐rates were given at the end of tillering 20 kg/ha N and at ear emergency 60 kg/ha N. For the optimal N‐fertilizing system we found a positive N‐balance (input‐output) in a range of 10–25 kg/ha. The influence of N‐fertilizing on the mineralized N‐amount in soil was very small comparing to influence of weather, soil type or crops. Only at one location a little increase of N min (10–15 kg/ha) could be observed after a positive N‐balance (50 kg/ha).