Journal of Food, Agriculture and Environment

The responses of rice growth and yield to water storage and control irrigation

Author(s):

Shurong Hao, Danping Ma, Ji Zheng, Xiang ping Guo *

Recieved Date: 2013-07-09, Accepted Date: 2013-10-14

Abstract:

Field plot experiments were applied to study the rice tillering number, leaf area index (LAI), photosynthesis rate (P_n), irrigation amount, grain yield and water use efficiency (WUE) of rice and rainfall utilization ratio through water storage and control irrigation. Results showed that the combination of moderate drought and shallow water storage after raining could bring compensation effect, and hence increase the tiller number and LAI and enhance P_n. Compared with conventional irrigation (CK), the grain yield was increased by 10.7-16.1%, the irrigation water amount was reduced by 21.3-37.1%, and the WUE was improved by 17.5-22.4%. On the other hand, as for the treatment of heavy drought combined with severe flooding, LAI and P_n were apparently restrained and could not resume to the level of CK during the late growth stage, and subsequently the grain yield was reduced by 17.7-19.6%, and the rainfall utilization was increased by 12-33%. Results indicated that the field water should be properly regulated to avoid the alternation of heavy drought and severe flooding. For the light drought treatment, the depth of the water storage after raining during the tillering stage should be controlled between 100 and 150 mm, and the depth of the water storage after raining for jointing-booting stage and heading to flowering stage should be controlled within 200 mm. The research provides the scientific proof for the rainy district to establish a reasonable water regulating and controlling mode.

Keywords:

Water storage, control irrigation, rice, yield, water use efficiency

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Agriculture
Pages: 1035-1038

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