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|Title:||Comparing of the difference and balance methods to calculate percent recovery of fertilizer phosphorus applied to soils: a critical discussion|
|Citation:||Nutrient Cycling in Agroecosystems, 2012; 92(1):1-8|
|S. H. Chien, F. J. Sikora, R. J. Gilkes, M. J. McLaughlin|
|Abstract:||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.|
|Keywords:||Percentage recovery of fertilizer P; Difference and balance methods; Initial and residual P effects; Percentage of soil P balance; P use efficiency|
|Rights:||© Springer Science+Business Media B.V. 2011|
|Appears in Collections:||Agriculture, Food and Wine publications|
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