摘要
为寻求劣质水(微咸水)滴灌施肥下的水肥耦合最优模型,通过正交实验设计,从水、肥、盐三个方面分析了不同生育期棉花耗水、土壤水分、土壤盐分、硝态氮等土壤因子的变化。结果表明:棉花耗水量与灌溉定额及土壤盐分有一定的相关关系。蕾期和花铃前期各处理土壤水分变异系数较大;花铃后期土壤硝态氮的积累量则逐渐增加;矿化度2～3 g.L-1的微咸水与淡水混灌对棉田土壤盐分的积累影响较小;正交分析得出了最优水平为灌水量为600mm,咸淡配比为2∶1,尿素施入量为80 kg.667m-2。方差分析表明灌溉定额和施肥量两个因素对产量有显著影响,并利用SPSS软件建立了两者与产量的二次回归模型。
To find out an optimal model for the coupling effects of water and fertilizer under drip irrigation with low-quality water（brackish water）,an orthogonal experiment was conducted to analyze the changes of water consumption,soil moisture and soil salt in cotton field at different growth stages.The results showed that the water consumption of cotton was related with irrigation quota and soil salt.At bud stage and early flowering and boll stage,the coefficients of variation of soil moisture were relatively high,while at late flowering and boll stage,the accumulation of soil nitrate-N was gradually increased.The irrigation of brackish water with 2～3 g·L-1 salinity mixed with fresh water produced little impact on soil salt accumulation in cotton field.Based on orthogonal analysis,the optimal management scheme were made,in which the irrigation quota,ratio of salty to fresh water and urea application amount were 600 mm,2∶1 and 80 kg·667m-2,respectively.Analysis of variance showed that the two factors of irrigation amount and fertilization affected the yield significantly.Furthermore,a quadratic regression model between these two factors and the yield was set up by using SPSS software.
出处
《干旱地区农业研究》
CSCD
北大核心
2013年第2期146-151,共6页
Agricultural Research in the Arid Areas
基金
国家自然科学基金项目(51169024)
兵团水利局灌溉试验项目(兵水发[2009]199号)
关键词
微咸水
滴灌
硝态氮
水肥耦合
brackish water
drip irrigation
nitrate-N
coupling effect of water and fertilizer
