论文部分内容阅读
在6个密度下研究沈爆3号的冠层结构、生理特征、产量和产量构成因素。结果表明,沈爆3号适合高密度种植且适应密度范围较大,密度在8.25万株/hm2时产量最高,分别比5.25万、6.00万、6.75万、7.50万、9.00万株/hm2增产21.96%、22.75%、11.50%、10.64%、7.92%,达到显著或极显著水平。在高密度下穗长、穗粗、行粒数、穗粒数、粒重、秃尖变化较小,单株产量维持较高水平。在9.00万株/hm2时达到最大叶面积指数(6.55),保持较大的叶面积指数和较长的持续时间。生育后期叶面积指数随密度增加而下降的速度较快,但密度在6.75万～9.00万株/hm2差异不大,高密度下仍可维持较高水平。不同密度之间穗位叶叶绿素含量存在微小差异,较低密度下最高叶绿素含量的出现时间较迟,而高密度下较早。增加密度使净光合速率下降,但较低密度下增密时下降幅度较大,3个高密度间下降幅度较小。
The canopy structure, physiological characteristics, yield and yield components of Shenbao No.3 were studied at six densities. The results showed that Shenbao No.3 was suitable for high density planting and had a large range of adaptable density with the highest yield at a density of 82,500 plants / hm2, which increased by 21.96 than 52,500, 60,000, 67,500, 75,000 and 90,000 plants / hm2, respectively %, 22.75%, 11.50%, 10.64%, 7.92% respectively, reaching significant or extremely significant level. At high density, panicle length, panicle diameter, grain number per panicle, grain number per panicle, grain weight, and bald tip had little changes, and the yield per plant was maintained at a high level. At 90,000 plants / hm2, the maximum leaf area index (6.55) was reached, maintaining a larger leaf area index and longer duration. The leaf area index decreased rapidly with the increase of density at late growth stage, but the density was not significantly different from 67500 ~ 90000 plants / hm2, but could still be maintained at high density. There was a slight difference in chlorophyll content of ear leaves between different densities. The highest chlorophyll content appeared at later densities at lower densities, but earlier at high densities. Increasing the density decreased the net photosynthetic rate, but the decrease was significant when the density was higher than that under the lower density and the decrease between the three high density was smaller.