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Einfluß einer variierten Stickstoffdüngung auf Assimilationsleistung und Ertragsbildung von Sommerweizen
Author(s) -
Orlovius K.,
Höfner W.
Publication year - 1976
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.19761390511
Subject(s) - assimilation (phonology) , human fertilization , respiration , nitrogen , zoology , agronomy , chemistry , horticulture , biology , botany , philosophy , linguistics , organic chemistry
Effect of varied N‐fertilization on assimilation rate and yield of spring wheat In pot experiments with spring wheat the effect of a variied N‐fertilization on yield and assimilation rate was studied by the use of 14 CO 2 . The assimilation rate per pot increases during the vegetative period in both years till the time short before flowering, followed by a decrease towards the end of experiment. Increased N‐supply results only in a small increase of total assimilation per pot, but in the young leaves of high nitrogen plants the assimilation was enhanced. N‐fertilization has a pronounced effect on the loss of assimilated 14 C due to respiration. Plants with high N‐supply lost 20%, those with low N‐supply 50% of the 14 C assimilated during the period of emergence of ears. The different yields of plants with variied N‐supply are not primarely the result of an altered assimilation rate, but of the different loss due to respiration.