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首页> 外文期刊>Haryana Agricultural University,Journal of Research >DYNAMICS OF POTASSIUM IN SOIL WITH ITS LONG-TERM USE UNDER DIFFERENT CROPPING SEQUENCES
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DYNAMICS OF POTASSIUM IN SOIL WITH ITS LONG-TERM USE UNDER DIFFERENT CROPPING SEQUENCES

机译：不同耕作顺序下土壤钾素的动态变化及其长期使用

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摘要

The present study summarizes the results on dynamics of potassium in soil with its long-term use under three different cropping sequences, i.e. pearl millet-wheat, sorghum-wheat andmoong bean-wheat. The study was conducted on a long-term field experiment in progress since1979. Since its inception, the experiment has been given two levels of phosphorus (0 and 60 kgP_2O_5 ha~(-1)) and four levels of potassium (0, 30, 60 and 90 kg K_2O ha~(-1)) with basal doses ofnitrogen and zinc to each crop. Continuous cropping of these systems has resulted into a sharpdecline in available potassium status of the soil. Maximum depletion was observed in pearl millet-wheat and least in moong bean-wheat rotation. After 26 years of cropping, the available K statusof the soil under pearl millet-wheat rotation has come down to 2157 kg ha~(-1) as compared to itsinitial level of 754 kg ha~(-1) in the control plots, where no potassium was added. Even additionsof 90 kg K_2O ha~(-1) in every crop season could not sustain the initial available K status of thesoil.
机译：本研究总结了在三种不同的种植顺序下，即珍珠粟-小麦，高粱-小麦和绿豆-小麦，长期使用钾在土壤中的动力学结果。该研究是自1979年以来正在进行的一项长期野外实验。自开始以来，该实验已根据基本剂量分配了两个水平的磷（0和60 kgP_2O_5 ha〜（-1））和四个水平的钾（0、30、60和90 kg K_2O ha〜（-1））。每种作物的氮和锌含量这些系统的连续种植导致土壤中有效钾含量急剧下降。珍珠粟-小麦中观察到最大的消耗，芒格豆-小麦旋转中观察到的消耗最小。经过26年的耕作，珍珠小米-小麦轮作下土壤的有效钾含量已降至2157 kg ha〜（-1），而对照区的初始水平为754 kg ha〜（-1）。没有添加钾。即使在每个作物季节添加90 kg K_2O ha〜（-1）也无法维持土壤的初始可用K状态。

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