Accumulation of Dry Matter and Nitrogen in Relation to Grain Yield in Corn
|Keywords:||玉米;栽培密度;營養生長;子粒充實;乾物質累積;氮素利用||Issue Date:||May-1995||Publisher:||農業試驗所||Start page/Pages:||95-115||Source:||農業試驗所特刊第49號||Conference:||雜糧作物生產技術改進研討會專刊||Abstract:||
Information pertaining to the growth characteristics of corn during vegetative growth is limited. The purpose of this study was to investigate the pattern of dry matter and N accumulation from sowing to silking and its impact on grain yield for corn hybrid Tainung 1. Field experiments were conducted in the fall crops of 1991-1993 with a row spacing of 75 cm. Within
- row spacings were 11, 22, and 44 cm, and the spacings were altered by thinning the stand at either tassel initiation or silking stage. The effects of spacing on dry matter and N accumulation were not significant until the 12- leaf stage. From the 12th leaf stage to silking, the amounts of dry matter and N accumulation by the plants accounted for 80-92% and 69-86%, respectively, of the accumulation at silking stage. The ratio between dry matter and N accumulation remained the same among plant spacing treatments, indicating the amount of dry matter production per unit of N was less affected by environmental factors. Dry matter accumulated from silking to 24 days after silking was partitionedrather evenly between kernels and other portions of the ear. Those plants with less vegetative growth at silking tended to have higher dry matter and N accumulation during kernel filling. In most treatments, the rate of N accumulation of the whole plant was lower than that of the kernels. The N use efficiency was increased by increasing the population density, presumably the result of enhanced N uptake efficiency. The performance of the components of N use efficiency was not affected significantly if the amounts of dry matter and N of corn plants were different at silking stage. Experimental results indicate that physiological activities during kernel filling of corn Tainung 1 was related to the vegetative growth condition, and the buffering capacity it exerted helped to stable kernel yield under unfavorable environmental conditions during the vegetative growth period.
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