不同灌溉方式下底墒水矿化度对棉花出苗率的影响

采用二因素随机试验设计，在田间进行了底墒水灌溉方式和矿化度对棉花耐盐特征值影响的试验研究。结果表明,畦灌和沟灌方式下,随着底墒水矿化度的增高,棉花出苗时间延迟;无论何种灌水方式，棉花的出苗率均与底墒水矿化度和土壤盐分含量呈线性负相关关系,采用矿化度小于4 g/L微咸水造墒，处理间出苗率差异未达极显著水平,畦灌和沟灌方式...

Effects of Water Salinity before Sowing on Cotton Emergence Rate under Different Irrigation Methods

In field trial,the complete randomized experiment design of two factors was adopted to study the effects of irrigation methods and salinity of irrigation water before sowing on the salt tolerance eigenvalue of cotton.Results showed that cotton emergence was delayed with the increasing of water salinity before sowing under border irrigation and furrow irrigation.Cotton emergence rates had a linear negative correlation with soil salt content under two irrigation methods.There was no significant difference in cotton emergence rates among treatments irrigated with the salinity of water less than 4 g/L.The tolerance of soil salt content in 0 to 20 cm depth for cotton emergence under border irrigation and furrow irrigation was 0.704% and 0.749%,respectively.Seedling growth was gradually getting worse with increasing of water salinity.The critical salinity of irrigation water for cotton emergence under border and furrow irrigation was respectively 2 to 4 g/L and 6 to 8 g/L based on an analysis of single plant leaf area.Considering emergence rate and seedling growth,water salinity below 4 g/L was suitable for irrigation before cotton sowing,which was better to use border irrigation.Water salinity less than 8 g/L was of some value,while it was better to adopt furrow irrigation as water salinity above 6 g/L.