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Correlation Studies on Ammonium/Nitrate Concentrations in Soil and Growth and Yield of Wheat
Author(s) -
Joseph P. A.,
Prasad Rajendra
Publication year - 1993
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.1993.tb00431.x
Subject(s) - ammonium , nitrate , urea , agronomy , chemistry , nitrogen , nitrification , ammonium nitrate , yield (engineering) , zoology , biology , materials science , biochemistry , metallurgy , organic chemistry
A field experiment was conducted at the Indian Agricultural Research Institute, New Delhi to study the growth and yield of wheat as influenced by the concentrations of ammonium‐N and nitrate‐N in soil. A series of ammonium and nitrate nitrogen concentrations in soil on a time frame was developed by treating prilled urea with nitrification inhibitors DCD or neem cake as well as by changing the dose and time of N application. The study revealed that number of tillers m ‐1 as well as ears m ‐1 row length were significantly positively correlated with ammonium‐N concentration at 15 and 30 DAS and nitrate‐N concentration at 30 and 45 DAS. Number of grains ear ‐1 was significantly positively correlated with ammonium‐N at 30, 45 and 60 DAS and nitrate‐N at 45 and 60 DAS. Ultimately grain yield in wheat was significantly positively correlated with ammonium‐N concentration at 15 and 30 DAS and nitrate‐N concentration at 30, 45 and 60 DAS. The response between grain yield and concentrations of both ammonium and nitrate forms of N was quadratic. The optimum concentration of ammonium‐N in soil for maximum grain yield gradually decreased with the age of the crop from 54.6 to 63.6 μg g ‐1 at 15 DAS to 22.7 to 26 μg g ‐1 at 30 DAS. In the case of nitrate‐N its optimum concentration for maximum grain yield increased with age of the crop from 25.1 to 30 μg g ‐1 at 15 DAS to 31.6 to 34 at 45 DAS and it decreased thereafter.