EFFICIENCY OF ORGANIC, INORGANIC NITROGEN FERTILIZERS AND THEIR COMBINATIONS ON RICE IN SALINE-SODIC SOILS

Abstract

A pot experimental work was conducted during 2014 by using RCBD
design at Faculty of Agriculture Gomal University Dera Ismail Khan
(KP) Pakistan. The results of pot experiments in open air indicated,
that the nitrogen transformation in soil and nitrogen uptake of the
rice plants were strongly influenced through the applied factors.
Different combinations of nitrogen fertilizers have been tested with
successful results in the rice productions. In case of rice straw and in
combination with the Mineral-N fertilizer caused the decreased grain
yield production, consequently bad N-uptake takes place in the crop
particularly at tillering stage. Green manure has in all combinations
an increased N-uptake due to the excessive N-application and the 3
times increased grain yield as compare to application of Mineral-N
without organic fertilizers. The increase in yield was especially very
clear with the application of urea as compare to ammonium sulfate.
The application of green manure in combination with urea increased
N-use efficiency and grain yield of the applied nitrogen considerably
as compare to the ammonium sulfate.