Rainfed rice - IRRI books - International Rice Research Institute

RAINFED RICE A SOURCEBOOK OF BEST PRACTICES AND STRATEGIES IN EASTERN INDIA
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Fertilisers and green
manuring
Green manure crops, such as
sesbania, sunhemp, green gram,
black gram and cowpea, are either
grown in the same field (in situ) or
transported from another field and
incorporated into soil for their
nutrient supply. The available
nutrients from green manure are not
enough to supply the total nutrient
requirement of the crop, so the rest
of the nutrients are applied through
fertilisers. The green manure. crop
can provide 20 to 60 kg N/ha.
Gliricidia sepium green leaf manuring
( ex situ ) can also be used.
Fertilisers and crop residues
The largest portion of crop residues
in India is used for fuel. Crop
residues incorporated into the soil
supply some of the nutrients, while
the rest are applied through
fertilisers.
Fertilisers and other organic
materials
Large quantities of organic
materials, such as water hyacinth,
etc., are available and used to meet
the partial requirement of nutrients
for rice. This is supplemented with
fertilisers.
Fertilisers and legumes in
rotation
By incorporating legumes in rotation
after rice, 20 to 30 kg of N is saved
and the rest of the nutrients are
supplied by fertilisers.