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Presentation

2nd Revision

Introduction

 
Data - Agricultural Technology
Grain yields by fertilizer application in China, 1952 - 1993
This plot shows the very close relationship between grain yields and fertilizer application in China between 1952 and 1993 (R > 0.98). In the 1950s, when fertilizer application was around 50 kg/ha, typical grain yields ranged between 1,200 and 1,500 kg/ha. In the early 1990s, when more than 300 kg of chemical and organic fertilizers were applied per hectare, crop yields were around 4,000 kg/ha.
However, this bivariant correlation probably somewhat overestimates the relationship, because it does not take into account the important effects of other cofactors of crop yield increases, such as irrigation, pesticide use, and other agricultural management techniques.
Yet there can be no doubt that the increase of fertilizer application - especially the increase of chemical fertilizer consumption - is a major factor in China's increase in crop productivity.

The data for the plot were taken from the following source: Wang, Q. / Halbrendt, C. / Johnson, S.R. (1995): Grain Production and Environmental Management in China's Fertilizer Economy. In: Journal of Environmental Management, Vol. 47, 283-296. And: China Statistical Yearbook, 1998. State Statistical Bureau, People's Republic of China, Beijing. p.393

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Revision 2.0 (First revision published in 1999)  - Copyright 2011 by Gerhard K. Heilig. All rights reserved. (First revision: Copyright 1999 by IIASA.)