四川丘陵季节性干旱区水稻田间耗水量研究

Studies on Water Consumption of Paddy Field in Seasonal Drought Hilly Region of Sichuan Province

以Ⅱ优7号为供试水稻品种,通过精确计量稻田进出水量,研究了四川典型丘陵地区稻田耗水量。结果表明,丘陵地区降水利用率为71.59%,但降水与稻田需水不完全同步;全生育期总灌水量为6 298.6 m3/hm2;稻田耗水量为8 884.4 m3/hm2。相关分析表明,稻田耗水量与稻谷产量呈显著正相关。在四川丘陵地区水稻生产中,节水仍有一定空间。

Using Ⅱ You 7,a hybrid rice variety,as the material,the water consumption of paddy field in typical hilly region of Sichuan Province was studied by accurately recording the amount of water flowing into and out the paddy field throughout the whole growing period.The results showed that the rainfall use efficiency was 71.59% in the hilly region,but the rainfall was not synchronous with the water requirement of paddy field.For the whole growing period,the total amount of irrigation and water consumption of paddy filed were 6 298.6 and 8 884.4 m3/hm2,respectively.The correlation analysis indicated that there existed a significant positive correlation between the water consumption of paddy field and grain yield.Some recommendations were given for water saving in rice production of the hilly region of Sichuan Province.