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The N min ‐method – an aid to integrating various objectives of nitrogen fertilization
Author(s) -
Wehrmann J.,
Scharpf H. C.
Publication year - 1986
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19861490407
Subject(s) - loam , human fertilization , leaching (pedology) , fertilizer , agronomy , soil water , nitrate , spinach , yield (engineering) , nitrogen , sugar beet , sugar , environmental science , mathematics , chemistry , soil science , biology , materials science , food science , biochemistry , organic chemistry , metallurgy
There is increasing interest in the rate and timing of N‐fertilization from both an economical and an ecological point of view. Fertilizer recommendations for a variety of aims can be made using the N min ‐method, as shown by experiments on deep rootable loess loam soils. Yields of cereal crops and sugar were increased by 2–3 dt/ha by application of the N min ‐method. The N min ‐method led to a reduction in the rate of fertilizer application by 30 kg N/ha with sugar beet. Any stipulated NO 3 level in leaf vegetables can be met, if N is fertilized according to N min ‐method. The necessary data for many vegetable crops are given. In particular low nitrate content in spinach and lettuce at high yield was achieved without loss of yield by adjusting both their NO 3 and Cl nutrition. Leaching of nitrate out of soils often follows the application of too much fertilizer, but fertilization errors can be avoided and leaching reduced if the N min ‐method is used. Applications and limitations of the N min ‐method are discussed.