提高地力的玉米群体生理机制研究

Study of Maize Population Physiological Mechanism Based on Improving Fertility

2007年和2008年对玉米大豆间作、并在间作区轮作的玉米群体与清种玉米群体生理参数和产量进行了比较研究。结果表明,玉米间作群体的最大叶面积指数(LAImax=6.60)高于清种群体(LAImax=4.39),且LAI>4的天数明显高于清种;在玉米各生育时期,间作群体的群体生长率(CGR)、净同化率(NAR)、光合势(LAD)都大于清种,其中除NAR外,其它生理参数均达到了差异显著水平;2007年、2008年玉米间作产量分别为525.70 kg/667m2和622.82 kg/667m2,分别比同年清种产量低1.6%和3.9%,但t测验结果表明,玉米间作与清种产量差异均未达到显著水平(p>0.05)。说明以提高地力为出发点的合理的间、轮作是能够保证产量的。

Physiological parameters and yield of the row intercropping population of maize and soybean which row is 4∶2 and sole cropping were studied in 2007 and 2008.The results indicated that the LAImax of row intercropping and sole cropping were 4.39 and 6.60,respectively.The days of LAI4 of row intercropping was higher than that of the sole cropping obviously.In maize growth periods,the crop growth rate（CGR）,net assimilation rate（NAR） and leaf area duration（LAD） of intercropping were greater than those of the sole cropping.T text showed,the difference of CGR and LAD had achieved the remarkable level between tow populations.The yield of intercropping population were 525.70 kg/667m^2 and 622.82 kg/667m^2 in 2007 and 2008,respectively.These yield were less than those of sole cropping population by 1.6% and 3.9%,respectively.But the yield difference has not achieved the remarkable level in every year（p〉0.05）.To sum up,the reasonable intercropping and crop rotation on according to improving fertility can reach the normal yield level.