数字农科院2.0

Effects Of Nitrogen Rate And S.plit Application Ratio On N itrogen Use And Soil Nitrogen Balance In Cotton Fields

文献类型： 外文期刊

作者： Liu Jingran;Zhao Xinhua;Liu Aizhong;Mao Shuchun;Sun Miao;Dong Helin;Li Pengcheng;Li Yabing;Liu Shaodong

作者机构：

关键词： apparent N recovery efficiency; crop yield; N agronomic efficiency; N fertilizer; plant growth; soil apparent N surplus

期刊名称： PEDOSPHERE

ISSN： 1002-0160

年卷期： 2017 年 27 卷 4 期

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摘要： The Yellow River valley is one of the three largest cotton production areas in China. An experiment was performed in cotton fields of Anyang, China from 2013 to 2014 to investigate the effects of nitrogen (N) application rate and the ratio between basal and topdressing N fertilizer on N balance in a soil-plant system, N use efficiency, and cotton yield. Five N application rates as treatments were applied with the same split application ratio. Half of the N (50% basal fertilizer) was applied at pre-planting and the other half (50% topdressing fertilizer) at the initial flowering stage. These treatments were: zero N (NO, control), 90 kg N ha(-1) (N90 (5/5)), 180 kg N ha(-1) (N180 (5/5)), 270 kg N ha(-1) (N270 (5/5), a reduced N rate), and 360 kg N ha(-1) (N360 (5/5), a conventional N rate). Additional 2 split application ratios as treatments were applied with the same N rate of 270 kg N ha(-1). The split application ratios between basal N and topdressing N were 30%:70% (N270 (3/7)) and 70%:30% (N270 (7/3)). Results demonstrated that soil NH4-N content in the 0-60 cm layer and NO3-N content in the 0-20 cm layer increased with increased N rate at the squaring and boll-opening stages and then decreased to lower levels at the initial flowering and harvest stages. Soil NO3-N content in the 20-60 cm layer after the initial flowering stage increased with the increase of topdressing N rate. Soil apparent N surplus varied at different growth stages, while the soil apparent N surplus over the entire growth period exhibited a positive relationship at N rates over 180 kg ha(-1). Seed cotton yield of N270 (3/7) was the highest of all treatments. Plant N uptake, N agronomic efficiency, and apparent N recovery efficiency of N270 (3/7) were significantly higher than those of N270 (5/5) and N270 (7/3) in both growing seasons. These suggest both economic and ecological benefits in cotton production in the Yellow River valley could be created, by appropriately reducing total N application rate and increasing the ratio of topdressing to basal N fertilizer at the initial flowering stage.

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