干旱区水肥耦合对棉花光合特性和产量的影响

在小区试验地面灌条件下,以品种中棉43号为研究材料,通过15种不同处理来研究水肥耦合对陆地棉光合特性和产量的影响。试验结果表明:N为630kg/hm2,P2O5为195kg/hm2,W为5475m3/hm2的处理在盛铃期棉株的净光合速率最高,为20.7μmol/m2·s,与其他处理差异达极显著水平;处理N3P2W2光合日变化呈单峰曲线,可较好的避免"光合午休"现象;不同处理与净光合速率最优回归方程结果显示,N用量为362.4kg/hm2,P2O5用量为135.15kg/hm2,灌水量为5425.8m3/hm2时,净光合速率有最大值19.37μmol/m2·s;光合特性与棉花产量最优回归方程显示,净光合速率为19.78μmol/m2·s,叶绿素含量为70.94%时,皮棉最高产量为3873.3kg/hm2。

Effect of Water and Fertilizer Coupling on Photosynthetic Characteristic and Yield of Cotton in Arid Area

Effect of water and fertilizer coupling on photosynthetic characteristics of Zhongmian 41 cotton was studied by field experiments under surface irrigation with water and fertilizer coupling 15 treatments.The results showed that under different treatments ,the photosynthetic rate could maintain a high level on 20.7 μmol/m2·s in the full boll stage of cotton,when the W was 5 475 m3/hm2 ,the N was 362.4kg/ hm2 and the P was 135.15 kg/hm2,the treatment has a significant negative correlation with others.The dirunal variation of the N3P2W2 treatment of leaf photosynthetic rate showed single peak, the N3P2W2 treatment can resolve the "Pn sleep at noon" phenomina;The regression equation of treatmens and net photosynthetic rate showed that when the treatment of the was 5 425.8 m3/hm2 ,the N was 362.4 kg/hm2 and the P2O5 was 135.15 kg/hm2,the net photosynthetic rate of cotton was the highest level on 19.37 μmol/m2·s; The regression equation of photosynthetic characteristics and yield showed that when the treatment of the net photosynthetic rate was 19.78 μmol/m2·s,the rear earth was 70.94%, the yield of cotton was the highest level on 3 873.3 kg/hm2.