水氮耦合效应对膜下滴灌棉花产量的影响

Effects of Water and Nitrogen Coupling on the Yield of Mulched-cotton by Drip Irrigation

为了探讨膜下滴灌棉花水肥耦合效应,于2003—2004年在北疆雨水较少地区开展不同水氮条件对棉花产量效应的大田试验研究。结果表明,在该试验条件下,土壤水分对产量的作用最大,氮肥次之;水氮耦合的产量效应表现为适宜土壤水分中施肥量效果最高,高土壤水分中施肥量次之,低土壤水分低施氮量最低;水氮交互大小的顺序是水氮耦合>土壤水分>施氮量;获得最高籽棉产量5 253 kg/hm2的灌水量为4 190 m3/hm2,施氮量为276 kg/hm2。

To seek for coupling effect of water and fertilizer on cotton by drip irrigation, experiments to study effects of different conditions of soil moisture content and nitrogenous fertilizers on cotton yield during 2003-2004 were conducted in North Xinjiang where there is rare rain . Results showed that water was the chief factor and nitrogen was the second factor to affect cotton yield. Yield effect of water and nitrogen coupling was the highest in the condition of suitable irrigation and middle nitrogen fertilizer, but was the lowest in low irrigation and low nitrogen fertilizer, and was between the two in high irrigation and middle nitrogen fertilizer. The effect order of interaction was water and nitrogen coupling 〉irrigation 〉nitrogen. When the irrigation amount was 4 190 m3/hm2,and nitrogen application rate was 276 kg/hm2, the output of seed cotton was the highest,up to 5 253 kg/ hm2.