Rainfed rice - IRRI books - International Rice Research Institute

Integration of Boro with DWR
When there is sufficient moisture in the soil, DWR can be grown by
broadcasting germinated seeds in the standing Boro crop before maturity.
After the Boro rice harvest, weeding and a topdressing of 20 kg N/ha are
required for a good DWR crop.
Through this system, additional yield of 1.5-2.0 t/ha can be harvested
without much extra investment.
Boro-Boro ratoon
Boro ratoon refers to the crop which grows from the stalk left after harvest
of the main Boro rice crop. Ratooning ability is a varietal characteristic and
is therefore important for this system.
The ratoon crop becomes ready within five to six weeks.
Ratooning is possible where Boro rice is harvested early and there is
sufficient moisture in the field, and the farms have irrigation facilities.
Additional yield of 2.0-2.5 t/ha may be obtained from Boro ratoon under
favourable conditions.
Boro-Boro ratoon: crop growing from stalk left after harvest
Boro rice or wheat
Boro rice or wheat can be grown in the same season. Boro is grown as an
alternate crop where wheat cannot be grown due to excess water in the field.
It is not profitable to grow Boro rice where wheat can be grown because
Boro rice, unlike wheat, requires frequent irrigation.
Major constraints in Boro rice cultivation
Seedling stage
At this stage, low temperature causes:
poor germination;
slow and stunted seedling growth;
yellowing of leaves;
leaf spots; and
slow and delayed tiller production.
Boro Rice Cultivation
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