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在麦后直播条件下,通过5个不同密度及留果枝数处理结合DPC系统化控试验,研究了短季棉不同密植群体的产量性状,以及群体叶面积、光合势、净同化率、生长率和干物重积累的变化特点,结果表明,在9~15.75万株.hm-2的密植范围内,每公顷总铃数、产量和霜前花率均随密度增加而提高,达显著正相关;而密度超过15.75万株.hm-2后,由于单株生长受到过度限制,单株铃数和铃重显著降低,导致群体生产力下降,每公顷铃数减少,产量降低.
Under the direct seeding condition of wheat, five different densities and the number of remaining fruit branches and the DPC system controlled experiment were used to study the yield traits of different close-planting cottons and their leaf area, photosynthetic potential, net assimilation rate and growth rate The results showed that there was a significant positive correlation between the total number of bolls per hectare, the yield and the frost before flowering rate with the increase of density under the density of 9-15.757 ha-2. When the density was more than 157,500 hm-2, the number of bolls per plant and the boll weight decreased significantly due to the excessive growth of individual plants. As a result, the population productivity decreased, the bolls per hectare decreased, and the yield decreased.