【摘要】 在膜下滴灌条件下,采用二次饱和D-最优设计,设置4个水分和4个氮素处理水平,研究了水氮互作对膜下滴灌甜菜块根产量、含糖率、产糖量及净产值的影响,以探究适宜甜菜种植区的膜下滴灌甜菜栽培的水氮管理模式。结果表明,水分效应显著大于氮素效应;甜菜产量、块根含糖率、产糖量及净产值与灌水量和施氮量均呈二次曲线关系;取步长为0.5,固定氮素水平,水分对块根产量、块根含糖率、产糖量及净产值的影响在各水平间表现出显著性差异。固定水分水平,氮素对块根产量、块根含糖率、产糖量及净产值的影响在氮素水平间虽有差异,但未达到显著水平;覆膜滴灌较露地沟灌水分利用效率提高30.67%,有效促进水分利用效率的水氮耦合效应;以根产量高于60000kg/hm2、含糖率15.3%~21.0%为目标所制定优化方案为:灌水3426~3600m3/hm2,施纯氮139~177kg/hm2。更多还原

【Abstract】 Field experiment was conducted during 2012.03-2012.10at experimental station of Shihezi University(45°19′N,86°03′ E)to study the effect of different levels of drip irrigation and nitrogen fertilizers on sugar beet yield,sugar content,sugar yield and net output value.Based on the field test of quadratic saturation D-optimal design,four irrigation(W1,W2,W3 and W4 with 3000,5610,7200 and 9000m3/hm2)and four N fertilizer(N1,N2,N3and N4with 0,130,210and 300kg/hm2)were arranged in six split plots with 3 replicates.The treatment W4 achieved the highest root yield,sugar yield and net income,followed by W3,W2 and W1.On the contrary,sugar content significantly decreased with the increase of irrigation levels.Increasing N fertilizer use increased root yield,sugar yield and net income,but not significantly.On the other hand,N fertilizer eased the side effect of increasing irrigation on sugar content.W4N3 recorded the highest values while significantly(0.01)decreased the water use efficiency.Compared with CK,mulch drip irrigation significantly increased the water use efficiency of sugar beet.Aims at getting high yield(≥6000kg hm2)and high quality(sugar content:15.3%-21.0%)root,irrigation level should reach 3426-3600m3/hm2 and 139-177kg/hm2 of N fertilizer.更多还原