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首页> 外文期刊>Soil Research >Influence of temperature and soil type on inhibition of urea hydrolysis by N-(n-butyl) thiophosphoric triamide in wheat and pasture soils in south-eastern Australia
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Influence of temperature and soil type on inhibition of urea hydrolysis by N-(n-butyl) thiophosphoric triamide in wheat and pasture soils in south-eastern Australia

机译：温度和土壤类型对N-（正丁基）硫代磷酸三酰胺在澳大利亚东南部小麦和牧场土壤中抑制尿素水解的影响

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摘要

Incubation experiments were conducted to assess the effectiveness of N-(n-butyl) thiophosphoric triamide (NBPT) for inhibiting hydrolysis of urea in three wheat-growing soils and one pasture soil in south-eastern Australia, under a range of temperatures (5, 15, 25 degrees C). The effectiveness of NBPT decreased with increasing temperature and with increasing urease activity. In the acidic pasture soil with high urease activity (186 mu g N/g soil. h) and high organic carbon content (11%), NBPT (0.1% w/w urea) had little impact on urea hydrolysis rates over all temperatures, with <1% urea remaining at Day 14. In the alkaline, wheat-cropping soils with lower urease activity (54-90 mg N/g soil. h) and lower organic carbon content (<1.5%), NBPT was able to effectively reduce urea hydrolysis over 14-15 days at 5 degrees C and 15 degrees C (>55% urea remaining). At 25 degrees C in the wheat soils, NBPT slowed the rate of urea hydrolysis, but by Days 14 and 15, <2% of the urea remained. NBPT applied at a rate of 0.1% urea would be an effective tool for slowing urea hydrolysis in the wheat-cropping soils under cool-climate conditions. The delay in urea hydrolysis in the pasture soil still provides the opportunity for increased flexibility in farm management, such as irrigation scheduling.
机译：在一定温度范围内，进行了温育实验，以评估N-（正丁基）硫代磷酸三酰胺（NBPT）在澳大利亚东南部的三种小麦生长的土壤和一种牧场的土壤中抑制尿素水解的有效性（5， 15、25摄氏度）。 NBPT的有效性随着温度的升高和脲酶活性的增加而降低。在具有高脲酶活性（186微克N / g土壤。h）和高有机碳含量（11％）的酸性牧场土壤中，NBPT（0.1％w / w尿素）在所有温度下对尿素水解速率的影响很小，在第14天残留的尿素<1％。在碱性的，小麦种植的土壤中，尿素酶活性较低（54-90 mg N / g土壤。h）且有机碳含量较低（<1.5％），NBPT能够有效在5摄氏度和15摄氏度下减少尿素水解14至15天（剩余尿素> 55％）。在小麦土壤中，温度为25摄氏度时，NBPT降低了尿素的水解速度，但是到第14天和第15天，仍残留了不足2％的脲。 NBPT用量为0.1％尿素将是在凉爽气候条件下减缓小麦作物土壤中尿素水解的有效工具。牧场土壤中尿素水解的延迟仍然为提高农场管理（如灌溉计划）的灵活性提供了机会。

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