摘要
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.
A study was carried out on the yield components and changing characteristics of leaf area index （LAI）, leaf area duration （LAD）, net assimilation rate （NAR）, crop growth rate （CGR） and dry matter accumulation of shortseason cotton direct-seeded after wheat harvest with five combination of crop density and corresponding reserved fruit branches. The eorrelation analysis showed that the total bolls per hectare, the fiber yield and its pre-frost part were positively correlated with population density within the range of 90 000～ 157 500 plants per hectare. While the yield started to decrease due to the excessive growth restriction on individuals and reduced boll number per plant, reduced boll weight and reduced population productivity were observed as plant density exceeded 157 500.
出处
《河南农业大学学报》
CAS
CSCD
北大核心
2005年第3期239-242,253,共5页
Journal of Henan Agricultural University
基金
河南省重大科技攻关项目(0322010800)
关键词
短季棉
种植密度
产量性状
光合特性
short-season cotton
density of crop
yield character
photosynthetic characteristics
