Title: Effects of Plant Density on Sink-source Relationship of Summer Maize(Zea mays L.)
Abstract: In order to reveal characteristics of source and sink,source-sink relationship,and the effect of source and sink on grain yield,find out the restrictive factors of grain yield,a study was conducted with three hybrids(Jingdan28,Zhengdan958,Nongda108) in four plant density(4.5×104plant/ha,6.0×104plant/ha,9.0×104 plant/ha) under limited light and heat conditions.The results showed that the population total leaves area and the dry matter production capacity increased with the increase of plant density,but the population total leaves area decreased rapidly from 30th day after silking under high density condition(9.0×104 plant/ha).Increasing the plant density was an effective approach to increase the total leaves area and grain yield by decreasing the leaves senescence from 30th days after silking and increasing the dry matter production capacity.The grain numbers per ear and grain weight decreased with the density increased,while the ear numbers,grain numbers per ear and the maximum potential sink capacity per unit area increased and was 16.7%-103%,4.7%-87% and 8.4%-73% higher of the high density(9.0×104 plant/ha) than those of the other treatments respectively.Increasing the plant density was an effective to obtain a larger sink capacity and higher grain yield.The sink-source ratio decreased gradually with the plant density increased.Under high plant density,both source and sink had effect on the formation of grain yield,but sink was the major restrictive factor.Increasing planting density with enlarging sink capacity and strengthening source was the key approach to obtain high grain yield of summer maize in Hebei Province.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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