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Evaluation on Overfertilization and Its Spatial-Temporal Difference about Major Grain Crops in China
Author(s): 
Pages: 201-210+240
Year: Issue:  10
Journal: Economic Geography

Keyword:  green productiongrain cropsoverfertilizationfertilizer reductionagricultural subsidiesspatial difference;
Abstract: Based on the cost-benefit data of agricultural products from 2002 to 2015, this paper employed Cobb-Douglas production function to evaluate the degree of overfertilization in the production of three major grain crops(rice, wheat and maize), and also analyzed the spatial-temporal difference of overfertilization of the three major grain crops. The results showed that: 1)The degree of overfertilization of rice, wheat and maize were respectively 43.48%, 34.58% and 32.76%,and the average degree of overfertilization of the three major grain crops in China has reached 36.94%, which is relatively high. 2)From the perspective of the temporal variation, the change trend of overfertilization degree of the three grain crops has experienced two stages: the decline stage(2002-2004) and the fluctuation stage(2005-2015). 3)From the perspective of spatial difference, the order of overfertilization degree of grain crops was as follows: South China >Middle and Lower Yangtze River > Huang Huai Hai Area > Northern Plateau Area > Southwest China > Northwest China > Northeast China. 4)Hainan, Guangdong, Guangxi, Hebei, Shandong and Jiangsu have larger potential of fertilizer reduction in rice production, which can reduce 1.3748 million tons of fertilizer. Shanxi, Anhui, Shandong, Ningxia,Shaanxi, Inner Mongolia, Hebei and Jiangsu have larger potential of fertilizer reduction in wheat production, which can reduce 2.0878 million tons of fertilizer. Jilin, Guangxi, Hubei and Yunnan have larger potential of fertilizer reduction in maize production, which can reduce 1.0275 million tons of fertilizer.
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