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Modellversuche zur Aufnahme von Boden‐ und Dünger‐Stickstoff aus verschiedenen Tiefen durch Sommerweizen *
Author(s) -
Dressel J.,
Jung J.
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.tb00079.x
Subject(s) - straw , nitrification , fertilizer , nitrogen , chemistry , ammonium , nitrogen fertilizer , agronomy , zoology , ammonium sulfate , biology , chromatography , inorganic chemistry , organic chemistry
Model trials on the uptake of soil and fertilizer nitrogen from various depths by spring wheat The uptake of ammonium nitrogen by spring wheat mixed into various soil depths was investigated in a pot trial using 1‐m high soil columns. At the same time a nitrification inhibitor (NI) was used in some of the variants in order to study the utilization of fertilizer N under the conditions of a temporary inhibition of nitrification. In order to monitor the interrelationships of soil and fertilizer N, 15 N‐labelled ammonium sulphate was used. The following results were obtained.1 The various depths at which the N was located were not found to affect yields; nor did the use of the NI have any influence. 2 There was a statistically significant increase in the N content of the grains as the N was mixed with deeper layers of the soil; this was at a lower level in the series with NI. In straw no change was observed in the series without NI, there being a decrease of the N content in the series with NI. 3 The utilization of fertilizer N according to the “difference method” was between 76 % and 84 % in the series without NI with an increasing tendency of the nitrogen located at deeper levels. In the series with NI there was a reverse tendency of 74 % to 69 %. According to the 15N method only 54–62 % of the fertilizer N was used by the plants. The NI scarcely changed the utilization. Overall there was not a significant higher use of the nitrogen in the deeper layers. 4 In the fertilized series more soil N was mobilized and taken up by the plants than in the control. This effect was more pronounced in the series with no NI. 5 The mobilization of soil N by fertilizer N (“priming effect”) contrasted with a more vigorous immobilization of fertilizer N. This resulted in an overall positive soil N balance. 6 A total of about 30 % of the fertilizer N remained in the soil. Most of it was to be found in the incorporation layer. However, displacement into the neighbouring layers did take place, this being more pronounced in the acropetal direction in the case of the N in the deeper layers than in the basipetal direction in the case of the N introduced into the top layer.