Soil acidification in a continuous cotton production system

IF 2.3 4区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Rajan Ghimire, Megha N. Parajulee, Pramod Acharya, Dol P. Dhakal, Abdul Hakeem, Katie L. Lewis
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引用次数: 3

Abstract

Effects of nitrogen (N) fertilization on soil organic carbon (SOC) and total N are well established, but their effects on soil acidification and emerging soil health indicators such as labile N and carbon (C) pools are not adequately documented. This research evaluated soil N and C pools and soil pH with long-term N management in continuous cotton (Gossypium hirsutum L.) production. Residual soil inorganic N, potentially mineralizable N and C, total N, SOC, pH, and electrical conductivity were measured after 17 yr of continuous N application. Comparison of five N rates (0, 56, 112, 168, and 224 kg ha–1) showed an increase in residual inorganic N pools and decrease in pH with an increase in N application rate, while other parameters did not change significantly. Soil acidification was significant with 168 and 224 kg N ha–1 rates. Soil pH dropped by 0.039 per kilogram increase in residual inorganic N. Optimizing N rate that minimizes residual inorganic N can reduce soil acidification.

Abstract Image

连续棉花生产系统中土壤酸化
氮肥对土壤有机碳(SOC)和全氮(total N)的影响已经确定,但其对土壤酸化和新兴土壤健康指标(如稳定氮和碳库)的影响还没有充分的文献记录。本研究评价了棉花连续生产长期施氮条件下土壤氮、碳库和土壤pH值。连续施氮17年后,测定了土壤残余无机氮、潜在矿化氮和碳、全氮、有机碳、pH和电导率。不同施氮量(0、56、112、168和224 kg hm - 1)下,随着施氮量的增加,剩余无机氮库增加,pH降低,其他参数变化不显著。施氮量为168和224 kg时,土壤酸化显著。剩余无机氮每增加1 kg,土壤pH值下降0.039;优化施氮量,使剩余无机氮最小化,可减少土壤酸化。
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来源期刊
CiteScore
3.70
自引率
3.80%
发文量
28
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