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Open AccessArticle

A Simple and Reasonable Calculation Equation of Balanced Fertilization

Agricultural Bureau of Sichuan, Nanchong Gaoping District, Nanchong 637100, China
Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China
Author to whom correspondence should be addressed.
Academic Editor: Mariangela Diacono
Agronomy 2015, 5(2), 180-187;
Received: 17 March 2015 / Accepted: 20 May 2015 / Published: 25 May 2015
Reasonable fertilization is a primary concern for agronomy scientists and farmers. However, there is still no satisfying calculation formula to guide farmer’s fertilizing. Five kinds of indices were tested in more than 500 field plots successively, and more than 50 pieces of long-term and short-term fertilizer field test data acquired by others were analyzed. Quick-acting fertilizers should be applied for balanced fertilization if the soil-available nutrient content is within the normal range. Through rigorous derivation and validation by a multi-year continuous 15N tracer field test, it is obtained that, total soil exogenous N = total output N − total recovery N + soil profit or lost N; utilization efficiency of fertilizer N = (output N − exogenous N) ÷ balanced application amount of N fertilizer. Optimal balanced utilization efficiency of fertilizer N, P, K = total recovery efficiency, and soil nutrient net amount = total amount after test − total amount before test. Equation application parameters were collected from more than 50 tests, which is more applicable than collecting from a single test. When soil-available nutrient content is excessively low or excessively high, adjusting this should be based on balanced fertilization to properly increase or reduce the fertilization rate. View Full-Text
Keywords: fertilizer utilization; fertilizer requirement; soil nutrient balance account fertilizer utilization; fertilizer requirement; soil nutrient balance account
MDPI and ACS Style

Lv, S.; Wang, X.; Liu, G. A Simple and Reasonable Calculation Equation of Balanced Fertilization. Agronomy 2015, 5, 180-187.

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