Drainage of water from the field can be very important during the time of crop establishment, high rainfall events and during attacks by crop pests.
In direct seeding situations which include nurseries, fields often need to be drained during the establishment stage to improve both the rate and number of plants established. While a growing rice crop can withstand total inundation for short periods, major yield losses will occur if lodged crops are flooded during the grain ripening stage and water cannot be removed because of poor drainage. In dry periods water may need to be re-circulated from one field to another to help save the crop. When pests such as the golden apple snail attack crops, the only recourse is to drain the whole field rapidly.
In most level fields drains around the periphery of the field will be sufficient to drain off excess water in a timely manner. In large fields and some nurseries, small internal drains running from the center of the field to the extremities of the field may also be needed.
Submitted by yogesh on Mon, 24/11/2008 - 11:02