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Das optimale N‐Angebot im Frühjahr bei unterschiedlicher Keimdichte von Winterweizen
Author(s) -
Wollring J.
Publication year - 1990
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.1990.tb00798.x
Subject(s) - plant density , agronomy , human fertilization , field experiment , spring (device) , winter wheat , mathematics , yield (engineering) , zoology , horticulture , biology , sowing , physics , thermodynamics
The optimal N‐supply in spring for different plant densities of winter wheat The influence of plant density (plt./m 2 ) on the optimal N‐supply in spring (N min ‐content + N‐fertilization) has been tested at three sites. The different plant density was produced by different seed rates in autumn of about 150, 250, 350, 450 and 550 grains/m 2 . The N‐supply in spring was ‐ apart from a non‐fertilized field (N min ‐content) 80, 100, 120, 140 and 160 kg N/ha. Additionally, 80 kg N/ha were applicated as N‐topdressing. Moreover the optimal N‐supply in spring has been tested on a winter wheat field thinned out due to winterkilling. In detail we got the following results: 1. The reduction of the N min ‐content due to the N‐uptake by the plants slowed down in accordance with minor plant density. 2. The same N‐supply in the soil produced a higher N‐supply per individual plant in accordance with decreasing plant density and lead to a considerable increase of N‐nutrition. 3. Thin crops showed a higher tillering. The differences in plant density between 150 and 550 plt./m 2 in spring diminished to about 90 ears/m 2 at harvest. 4. Independently of plant density the maximum yield was obtained by a N‐supply (N min + N‐fertilization) in spring of about 120 kg/ha N. Due to the abundant N‐nutrition of the individual plants and the minor increase of yield a higher N‐supply is not necessary with a minor plant density. 5. Essentially the yield level was only diminished with the lowest plant density (100‐140 plt./m 2 ).