Grain Productivity and Its Potential as Related to Fertilizer Consumption among Different Counties of China
Received date: 2001-12-20
Revised date: 2002-07-09
Online published: 2002-09-25
Supported by
National Key Project for the Ninth Five-Year-Plan, No.96-013-01-04
According to the total amount and statues of chemical fertilizer consumption, and grain yields during the last 10 years (1990-1998) in each county of China, regional differences in grain productivity and grain productivity increased by additional application of fertilizers were analyzed and compared. Results of the study are concluded as follows: Grain productivity and grain yield increased by additional application of fertilizers in most of the counties varied from 3500 kg/hm2 to 5250 kg/hm2 and from 300 kg/hm2 to 600 kg/hm2, respectively. The index of grain yields increased (IGYI) by additional application of per kilogram of fertilizers varied from 5 kg grain/ kg fertilizer to 10 kg grain/ kg fertilizer. The grain yield and grain productivity were found to be 5372 kg/hm2 and 7462 kg/hm2 in Eastern Region with high input of fertilizers, to be 4940 kg/hm2 and 7216 kg/hm2 in the Central Region with middle input of fertilizers, and to be 3844 kg/hm2 and 5470 kg/hm2 in the Western Region with low input of fertilizers. It was indicated that potential of grain productivity increase per sowing area was 754 kg/hm2 in the Central Region that was lower than that in the Western Region (948 kg/hm2) and higher than that in the Eastern Region (714 kg/hm2). The IGYI for different regions were found to decrease as the following order: Western Region (9.41 kg grain /kg fertilizer) > Central Region (7.17 kg grain /kg fertilizer) > Eastern Region (-11.1 kg grain /kg fertilizer). It is concluded that the Eastern Region had the highest grain productivity, but had lowest potential for yield increase when more fertilizer is used because less response of grain yield was found to the additional application of fertilizer. However, the response of grain yields in the Western and Central Regions were higher to the additional application of fertilizer Therefore, more fertilizer should be used in the Western and Central Regions to improve China's grain production.
Key words： chemical fertilizer; grain; productivity; regional difference; GIS; China
ZENG Xibo, CHEN Tongbin, HU Qingxiu, LIN Zhonghui . Grain Productivity and Its Potential as Related to Fertilizer Consumption among Different Counties of China[J]. Acta Geographica Sinica, 2002 , 57(5) : 539 -546 . DOI: 10.11821/xb200205005
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