›› 2019, Vol. 31 ›› Issue (2): 191-199.DOI: 10.3969/j.issn.1004-1524.2019.02.03

• Crop Science • Previous Articles     Next Articles

Characteristics of effective precipitation and water requirement of rice in Guizhou

ZHANG Bo1, 2, GU Xiaoping1, *, GU Shuhong1, HU Jiamin1   

  1. 1. Guizhou Institute of Mountainous Environment and Climate, Guiyang 550002, China;
    2. Guizhou Key Laboratory of Mountainous Climate and Resources, Guiyang 550002, China
  • Received:2018-05-15 Online:2019-02-25 Published:2019-03-06

Abstract: In order to analyze the characteristics of rice effective precipitation and irrigation water requirement in Guizhou, the daily meteorological data of 80 meteorological stations in Guizhou during 1961-2015 were collected, and the effective precipitation and water requirement in different growth stages of rice in Guizhou were calculated by effective precipitation recommended by the United States Department of Agriculture (USDA) Soil Conservation Agency and reference crop evapotranspiration recommended by the United Nations Food and Agriculture Organization (FAO). The variation characteristics of irrigation amount and irrigation demand index at different rice growth stages were also analyzed. It was shown that the effective precipitation in the whole rice growth season in Guizhou was 324 mm, and presented a decreasing trend. The transplanting-heading period showed the highest effective precipitation along with an increasing trend, yet the effective precipitation in other growth periods showed a decline trend. The total water requirement of the whole rice growth season was 737 mm, and showed a decline trend. Specifically, the water requirement in rice transplanting-heading and heading-filling stage showed a decline trend, yet the water requirement in other growth period showed an increasing trend. The average water shortage during the whole rice growth season was 413 mm along with an increasing trend. The water shortage in rice transplanting-heading stage exhibited a decline trend, yet the water shortage in other growth period showed an increasing trend. The water budget index of the whole rice growht season was 0.56. Within the whole growth season, the rice heading-filling stage was most dependent on irrigation.

Key words: rice, effective precipitation, water requirement, water budget index, Guizhou

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