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fertilizer ^(15)n Accumulation, Recovery and Distribution in Cotton Plant as Affected by n Rate and Split

Journal of Integrative Agriculture 2013年第6期12卷 999-1007页

作者： YAnG Guo-zheng CHU Kun-yan TAnG Hao-yue nIEYi-chun ZHAnG Xian-long College of Plant Science and Technology Huazhong Agricultural University Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River Ministry of Agriculture

n fertilization of 300 kg n ha-1 is normally applied to cotton crops in three splits： pre-plant application （PPA, 30%）, first bloom application （FBA, 40%） and peak bloom application （PBA, 30%） in the Yangtze River Valley China. However, low fertilizer n plant recovery （nPR）（30-35%） causes problems such as cotton yield stagnation even in higher n rate, low profit margin of cotton production and fertilizer release to the environment. Therefore, it is questioned： Are these three splits the same significance to cotton n uptake and distribution？ An outdoor pot trial was conducted with five n rates and 15 n labeled urea to determine the recovery and distribution of 15n from different splits in cotton （Gossypium hirsutum L. cv. Huazamian H318） plant. The results showed that, cotton plant absorbed fertilizer 15n during the whole growing period, the majority during flowering for 18-20 d regardless of n rates （150-600 kg ha-1）. fertilizer 15n proportion to the total n accumulated in cotton plant increased with n rates, and it was the highest in reproductive organs （88% averaged across n rates） among all the plant parts. FBA had the highest nPR （70%）, the lowest fertilizer n lose （FnL, 19%）, and the highest contribution to the fertilizer 15n proportion to the total n （46%） in cotton plant, whereas PPA had the reverse effect. It suggests that FBA should be the most important split for n absorption and yield formation comparatively and allocating more fertilizer n for late application from PPA should improve the benefit from fertilizer.

关键词： cotton fertilizer n split application nPR (fertilizer n plant recovery)

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Effect of Cl￣ on Behavior of fertilizer nitrogen, nnmberof Microorganisms and Enzyme Activities in Soils

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Pedosphere 1994年第4期4卷 357-361页

作者： SHIWEI－YOnG CHEnGMEI－ZI 等 Dept.ofSoilSci.andPlantnutrition ZhejiangAgriculturalUniversityHangzhou310029China Dept.ofSoilSci.a

Pot experiments were conducted to study the effect of Cl￣- on transformation of fertilizer n, number ofmicroorganisms and enzyme activities in soils. It is indicated that Cl￣- did not show significant influenceon total number of bacteria, actinomyces and fungi, but significantly reduced the number of nitrosobacteria,which led to decrease of nO content in the soil. Application of Cl￣- to soil could significantly enhance theactivities of phosphatase and urease in the coastal saline soil and orthic aquisols. In hilly red soil, however,the application of Cl￣- at the rate of 500-1000 mg Cl￣- kg￣(-1) soil significantly decreased the activity of thetwo enzymes mentioned above.

关键词： Cl￣- i enzyme fertilizer n microorganism soils

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