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Assessment of the contribution percentage of inherent soil productivity of cultivated land in China |
WANG Shi-chao1, WANG Jin-zhou1, ZHAO Ya-wen1, REN Yi2, XU Ming-gang1, ZHANG Shu-xiang1, LU Chang-ai1 |
1 National Engineering Laboratory of Farmland Cultivation Technology/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2 The National Agro-Tech Extension and Service Center, Beijing 100125, P.R.China |
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Abstract The contribution percentage of inherent soil productivity (CPISP) refers to the ratio of crop yields under no-fertilization versus under conventional fertilization with the same field management. CPISP is a comprehensive measure of soil fertility. This study used 1 086 on-farm trials (from 1984–2013) and 27 long-term field experiments (from 1979–2013) to quantify changes in CPISP. Here, we present CPISP3 values, which reflect the CPISP states during the first three years after site establishment, for a series of sites at different locations in China collected in 1984–1990 (the 1980s), 1996–2000 (the 1990s), and 2004–2013 (the 2000s). The results showed that the average CPISP3 value for three crops (wheat, rice, and maize) was 53.8%. Historically, the CPISP3 in the 1990s (57.5%) was much higher than those in the 1980s (50.3%), and the 2000s (52.0%) (P≤0.05). Long-term no-fertilization caused CPISP levels to gradually decline and then stabilize; for example, in a mono-cropping system with irrigation, the CPISP values in Northwest and Northeast China declined by 4.5 and 4.0%, respectively, each year for the first ten years, but subsequently, the CPISP values stabilized. In contrast, the CPISP for upland crops in double-cropping systems continued to decrease at a rate of 1.1% per year. The CPISP for upland-paddy cropping decreased very slowly (0.07% per year), whereas the CPISP for paddy cropping decreased sharply (3.1% per year, on average) for the first two years and then remained steady during the following years. Therefore, upland crops in double-cropping systems consume the most inherent soil productivity, whereas paddy fields are favourable for maintaining a high level of CPISP. Overall, our results demonstrate a need to further improve China’s CPISP3 values to meet growing productivity demands.
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Received: 24 July 2018
Accepted:
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Fund: This work was financially supported by the Agro-scientific Research in the Public Interest of China (201503122) and the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences (CAAS-XTCX2016008).
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Corresponding Authors:
Correspondence LU Chang-ai, Tel/Fax: +86-10-82108703, E-mail: luchangai@caas.cn
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| About author: WANG Shi-chao, E-mail: wangschao@163.com; |
Cite this article:
WANG Shi-chao, WANG Jin-zhou, ZHAO Ya-wen, REN Yi, XU Ming-gang, ZHANG Shu-xiang, LU Chang-ai .
2019.
Assessment of the contribution percentage of inherent soil productivity of cultivated land in China . Journal of Integrative Agriculture, 18(11): 2619-2627.
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