Title: Effects of Application Time and Basal/topdressing Ratio of Nitrogen Fertilizer on Leaf Physiology and Grain Yield of Wheat in Central Henan
Abstract: Central Henan is a major winter wheat production area of Henan Province.In this paper,the effects of application time and basal/topdressing ratio of nitrogen fertilizer on leaf physiology and grain yield of winter wheat Bainong'aikang 58 were studied from 2007 to 2008 in central Henan.With two-factor randomized block design,three ratios of nitrogen basal/topdressing and two applying times were included in this experiment,and the total pure nitrogen was 270 kg per hectare.Nitrogen basal/topdressing ratio was 3∶7,5∶5 and 7∶3,respectively.And the topdressing stages were at either standing stage or jointing stage.The results showed that nitrogen treatments influenced leaf physiology and grain yield significantly.Sufficient basal nitrogen could improve leaf chlorophyll content in early growing stage.Applying nitrogen at jointing stage was beneficial to the growth of wheat compared with applying at standing stage.Adding topdressing nitrogen and applying nitrogen at jointing stage could increase the chlorophyll content and nitrate reductase activity of leaves in late growing stage,decrease the malonaldehyde content of leaves after heading stage,and meanwhile increased the grain weight.The results of variance analysis showed that nitrate reductase activity of leaves was influenced significantly by the interaction of application time and basal/topdressing ratio.In central area of Henan province,it was feasible to apply pure nitrogen 270 kg per hectare,in which the basal/topdressing ratio was 3 to 7 and the applying time was at jointing stage.With this nitrogen treatment,leaf senescence could be delayed,higher grain number per spike and grain weight could be achieved,and therefore higher grain yield could be obtained.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 1
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