Rainfed rice - IRRI books - International Rice Research Institute

RAINFED RICE A SOURCEBOOK OF BEST PRACTICES AND STRATEGIES IN EASTERN INDIA
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Comparison of grain yield at different doses of P 2 O 5 and organic manure
Integrated nutrient management
Integrated nutrient management means the supply of plant nutrients
through the mixing of organic manure, biofertiliser and chemical fertilisers.
The role of integrated nutrient management is very important, particularly
in rainfed rice ecosystems.
Input costs will be less due to the use of in-house organic materials like
cattle dung, feed waste, crop waste, etc.
It improves fertiliser use efficiency.
It improves the moisture retention capacity of soil.
It increases yield and net returns.
Application of organic wastes also maintains a clean environment.
On the other hand, application of
organic manure increases the water-
holding capacity of the soil. For
example, a study showed that at 2%
and 7% organic matter levels,.
available water supply was 0.25%
and 0.26%, respectively, in heavy-
texture soil. This means that the
higher the organic matter
application, the higher the available
water content of the soil.