高矿化水灌溉对水稻生育和产量的影响

在淡水资源不足情况下,研究利用高矿化水灌溉的可能性具有重要的现实意义。本试验在水稻返青期和分蘖期采用人工盐渍化田间小区技术,观察了利用咸水灌溉对水稻生育和产量的影响。五种不同盐分浓度处理的相对产量分别为92.5％、86.3％、77.7％、67.6％和47.9％。试验表明水稻不同生育阶段其抗盐力不同;咸水延续时间的长短对水稻危害程度不同;盐害是灌溉水含盐和田格水盐分浓度共同作用的结果。本文根据试验和生产调查,提出灌溉水质评价指标,这在滨海地区回归水利用和引潮灌溉中具有重要的实用价值。

Effects of Saline Water Irrigation on Rice Growth and Yield

Under conditions of shortage of fresh water, a study of possible use of saline water for irrigation is of practical significance.While using the tech- nique of artificial salinization of field plot at rice seedling turning green stage and tillering stage, observation was made on the effects of saline water irrigation on rice growth and yield. The rolative crop yields under freatments of five varying degrees of salinity were 92. 5, 86. 3, 77. 7, 67. 6 and 47. 9 in percentage. Different Saltresistance wag observed in rice at differ- ent growth stages. As the duration of saline water irrigation extended, the harm to crop increased. Salt damage was the result of combined action of the salt contained in irrigation water and the concentration of saline water in the field check. Based on experiments and study on production, salinity criteria for irrigation water are suggested, which have importment practical value in using return water and drawing tide--water for irrigation in coastal regions.