引黄灌区水稻节水节肥最优组合方案研究

Research on Optimum Combination Scheme for Rice in Yellow River Irrigation Area

采用正交试验法,在砂性土壤上对控灌条件下的水稻水平畦田规格、灌水下限和施氮量三因素最优组合方案进行了试验研究。结果表明,三因素对水稻生长发育及产量影响的主次顺序为施氮量（主）-灌水下限-水平畦田规格（次）。在一定范围内,水稻产量随着水平畦田规格的增大产量逐渐减小;随着灌水下限和施氮量的增加产量逐渐增加。由三因素对水稻生理性状及产量的影响分析结果,得出水平畦田规格为0.134hm^2、灌水下限为饱和含水率的80%~90%,施氮量为464.25kg/hm^2为试验最优组合方案,为水稻节水节肥增产提供了技术依据。

The optimal combination scheme experiment for three factors, including level-border specifications, the lower limit of the soil water content and nitrogen rate, is carried out under the condition of level-border control irrigation for rice in the sand of soil by cross experiment methods. The result indicates that the order of main factors affecting rice production is nitrogen rate, the lower limit of the soil water content, and level-border specifications. In a certain range, yield decreases with the increase of level-border specifications, while it increase with the increase of lower limit of the soil water content and nitrogen rate. According to variance a- nalysis of rice physiological characteristics and yield, the optimal combination scheme of the three factors is that the level-border specifications is 0. 134 hm^2 , the lower limit of the soil water content is controlled at 80%-90% of field saturated moisture content, and the nitrogen rate is 464. 25 kg/hm^2.