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首页> 外文期刊>The Kasetsart Journal >Equations for Calculating N-Fertilizer Rates for Khaw Dauk Mali-105 Rice from Soil Analysis
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Equations for Calculating N-Fertilizer Rates for Khaw Dauk Mali-105 Rice from Soil Analysis

机译：通过土壤分析计算Khaw Dauk Mali-105水稻的氮肥速率方程

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摘要

Comparisons were made to assess th ereliability of 10 chemical methods for evaluating the availability of N in soils to Khaw dauk Mali-105 rice and for calculating rates of N-fertilizer for rice. The method studied were: (1) measuring soil organic matter by walkly and Blak's method, (2) measuring total soil N by Kjeldahl's metod, (3) extracting soil N with acidified K_2CR_2O_7 solution, (4) extreacting soil N with basified KmnO_4 solution, (5) extracting soil N with acidified KmnO_4 solution, (6) extracting soil N with solution of CaCl_2 and K_2SO_4, (7) extracting solil nitrate according to Keeney and Nelson (1982) and Then measuring the extracted nitrate b Kjeldahl distillation, (8) extracting mineral N in soils with 2N KCI Followed by distillation of NH_3 with MGO and Devarda alloy, (9) measuring NH_4-N production from Incubation of soils under waterlogged conditions for 7 days, and (10) measuring NH_4-N production from Incubation of soils under waterlogged conditions for 7 days, and (10) measuring NH_4-N production from Incubation o soils under waterlogged conditions for 7 days, and (10) measuring NH_4-N production from Incubation of soils under waterlogged conditions for 14 days.
机译：进行了比较，以评估10种化学方法的可透性，这些化学方法用于评估土壤对土壤中Kw dauk Mali-105水稻的氮的有效性以及计算水稻中N肥料的比率。研究的方法是：（1）用步行法和Blak方法测量土壤有机质；（2）用凯氏定氮法测量土壤总氮；（3）用酸化的K_2CR_2O_7溶液提取土壤N；（4）用碱化的KmnO_4溶液处理土壤N。 ，（5）用酸化的KmnO_4溶液提取土壤N，（6）用CaCl_2和K_2SO_4的溶液提取土壤N，（7）根据Keeney和Nelson（1982）提取硝酸盐溶胶，然后通过凯氏定氮法测量提取的硝酸盐，（ 8）用2N KCI萃取土壤中的矿质N，然后用MGO和Devarda合金蒸馏NH_3，（9）在浸水条件下培养7天测量土壤中NH_4-N的产生，以及（10）测量土壤中NH_4-N的产生在淹水条件下孵育土壤7天，以及（10）在淹水条件下测量土壤孵育7天的NH_4-N产量，以及（10）在淹水条件下测量土壤孵育NH_4-N的产量1 4天。

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