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选用郑单958(ZD958)和先玉335(XY335)为试验材料,设置3、5、7、9 cm 4个播深处理和4个播种深度混播的播深不一致处理(U),研究播种深度对夏玉米冠层结构、光合特性和产量的影响。结果表明,播深不一致显著降低株高、穗位高、果穗长度等性状整齐度,影响群体冠层结构,ZD958和XY335的产量较3、5 cm播深分别下降2.6%、3.2%和0.9%、3.9%。播种过深,整个生育期内的植株性状整齐度和叶面积指数较低,穗位高及底层透光率增加;SPAD值及比叶重较低,净光合速率和单株干物质积累下降。ZD958和XY335播深9 cm的产量较3、5 cm播深分别下降5.9%、6.4%和6.1%、8.8%。播深7和9 cm,夏玉米群体密度降低,冠层透光率增加,但其叶面积指数、SPAD值和比叶重降低,净光合速率和单株干物质积累下降,最终降低夏玉米产量。
In the experiment, the sowing depths of 3, 5, 7, 9 cm 4 and the 4 sowing depth mixed sowing depths (U) were set by using Zhengdan 958 (ZD958) and Xiangyu 335 (XY335) Effects of canopy structure, photosynthetic characteristics and yield of summer maize. The results showed that inconsistent sowing significantly reduced the uniformity of traits such as plant height, ear height and ear length, and affected the canopy structure. The yield of ZD958 and XY335 decreased 2.6%, 3.2% and 0.9% , 3.9%. Sowing over too deep, the whole plant growth period of the characters and uniformity of the lower leaf area index, ear height and the bottom of the light transmittance increased; SPAD value and specific leaf weight was lower, net photosynthetic rate and dry matter accumulation decreased. The sowing depth of 9 cm of ZD958 and XY335 sowing decreased by 5.9%, 6.4% and 6.1%, 8.8% respectively than the sowing depth of 3,5 cm. At sowing depth of 7 cm and 9 cm, the population density of summer maize decreased and the light transmittance of canopy increased, but the leaf area index, SPAD value and specific leaf weight decreased, net photosynthetic rate and dry matter accumulation per plant decreased, .