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首页> 外文期刊>Nutrient Cycling in Agroecosystems >Comparing of the difference and balance methods to calculate percent recovery of fertilizer phosphorus applied to soils: a critical discussion.
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Comparing of the difference and balance methods to calculate percent recovery of fertilizer phosphorus applied to soils: a critical discussion.

机译：比较差异和平衡方法以计算施于土壤的肥料磷的回收率：一个重要的讨论。

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摘要

This article presents a critical discussion comparing the traditional method and a newly proposed balance method to calculate percent recovery of fertilizer P applied to soils. The traditional difference method is defined as P uptake from the soil treated with fertilizer P minus P uptake from a control with no P added divided by the amount of fertilizer P applied. The balance method simply considers the ratio of P uptake from the P fertilized soil to the amount of fertilizer P applied and does not use a control to discount P taken up from soil without fertilizer application. The percentage recovery of fertilizer P calculated by the difference method normally ranges from 10 to 25% for a given crop in a given season and is always lower than that by the balance method which ranges from 50 to 90% and is sometimes over 100%. The balance method is inappropriate to calculate percentage recovery of current fertilizer P applied due to its overestimation and the invalidity of the mathematical equation used. The difference method is superior to the balance method to estimate percentage recovery of fertilizer P applied. The balance method is suitable for determining a percent soil P balance to evaluate if fertilizer P applications are building up, depleting, or maintaining soil P reserves.
机译：本文提出了一个批判性讨论，将传统方法与新提议的平衡方法进行比较，以计算施于土壤的肥料P的回收率。传统的差异方法定义为用肥料P处理过的土壤中的P吸收量减去未添加P的对照中的P吸收量除以施用的P肥料量。平衡法只是考虑了从磷肥土壤中吸收的磷与施用的肥料P的比率，而没有使用对照来折算从不施用肥料的土壤中吸收的磷。对于特定的作物，在特定季节内，通过差异法计算出的肥料P的回收率百分比通常在10％到25％之间，并且始终低于平衡法从50％到90％的肥料回收率，有时超过100％。由于过高估计和所用数学公式的有效性，平衡法不适用于计算当前施用的肥料P的百分比回收率。差异法优于平衡法来估算施用的肥料P的百分比回收率。该平衡方法适用于确定土壤P平衡百分比，以评估肥料P的施用是否在增加，消耗或维持土壤P的储备量。

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