Irrigation is the artificial application of
water to the soil to satisfy crop water need.
SCHEDULING IN RICE
Since irrigation water is a of limited
supply in most of the place, on emphasis should be dead on making the most
efficient aid economic use of water for effect of water shortage of different
stage of rice on yield.
|
Period of water stress
|
Grain yield (t/ha)
|
||||
|
Crop age in days
|
stage
|
AP 130
|
Trainchung Nativel
|
||
|
|
|
Abortive
|
Relative
|
Absolute
|
Relative
|
|
never
|
|
6.7
|
10.0
|
7.4
|
10.0
|
|
O to 20
|
Tiller initiation
|
4.9
|
7.3
|
6.1
|
8.3
|
|
20 to 40
|
Maximum filleting
|
6.3
|
9.3
|
6.9
|
9.4
|
|
40 to 60
|
Primordial growth
|
5.3
|
7.9
|
6.1
|
8.3
|
|
60 to 80
|
Flowering
|
5.1
|
7.5
|
6.1
|
8.3
|
|
80 to 100
|
maturity
|
6.7
|
10.0
|
7.3
|
9.2
|
Source Gautam and
Dastane 1970
Frequency of the irrigation in rice
The frequency of
irrigation are closely related and are often interchangeable with higher
frequency of irrigation. The between two irrigation decrease. In a given
period, while with lower frequency the internal between two irrigation
increases. The term, internal of irrigation indicates the time gap.
However expressed in days, between two
subsequent irrigation. The total amount of water required by a crop for
producing an optimum yield is termed as delta of water and it is synonymous.
Frequency of irrigation should be as
low as possible to avoid waste of water of course, frequent irrigation with
smaller depths of water.