Responses of soil mineral N contents, enzyme activities and crop yield to different C/N ratio mediated by straw retention and N fertilization

LI Tao; HE Chun’e; GE Xiaoying; OUYANG Zhu

doi:10.13930/j.cnki.cjea.160357

Volume 24 Issue 12

Nov. 2016

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Article Navigation > Chinese Journal of Eco-Agriculture > 2016 > 24(12): 1633-1642 > DOI: 10.13930/j.cnki.cjea.160357

LI Tao, HE Chun’e, GE Xiaoying, OUYANG Zhu. Responses of soil mineral N contents, enzyme activities and crop yield to different C/N ratio mediated by straw retention and N fertilization[J]. Chinese Journal of Eco-Agriculture, 2016, 24(12): 1633-1642. DOI: 10.13930/j.cnki.cjea.160357

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Responses of soil mineral N contents, enzyme activities and crop yield to different C/N ratio mediated by straw retention and N fertilization

1.
1. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China 2. University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

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Received Date: 2016-04-16
Revised Date: 2016-10-27
Issue Publish Date: 2016-11-30

Abstract

Abstract

The quality of straw affects N release after straw retention. As straw with high C/N ratio could result in N immobilization, additional N is needed to compensate N demand of crop. More and more N fertilizer is applied to soil for high crop yields in China. Therefore, how to scientifically apply N fertilizer is a key problem after straw retention. Based on C/N ratio, we carried out a field experiment to study the effects of different C/N ratios on soil mineral N content, microbial parameters and crop yields during the period of 20122013 in a winter wheat-summer maize double cropping system. The field experiment consisted of six treatments: 1) straw removal without fertilizer; 2) straw retention without N fertilizer; 3) straw retention with conventional N fertilizer (C/N ratio 10︰1); 4)straw retention with mineral N fertilizer (adjusted C/N ratio of 16︰1); 5) straw retention with mineral N fertilizer (adjusted C/N ratio of 25︰1); 6) straw retention with an adjusted C/N ratio of 25︰1 using organic N fertilizer (cattle manure). The results showed that: 1) there was no difference between the addition of mineral N fertilizer and organic N fertilizer on soil mineral N content under the same C/N ratio (25︰1) input. In the case of straw retention amended with mineral N fertilizer, C/N ratio of straw retention had significant influence on soil mineral N content, and C/N ratio was negatively related to soil mineral N content. 2) Straw retention amendment with N fertilizer increased soil microbial biomass N content, while no difference in soil microbial biomass N content among different N fertilizer inputs treatments. Straw retention amended with N fertilizer with sitting in integrated judgment, the urease activity had no remarkably different. Straw retention amended with N fertilizer increased FDA hydrolyase activity, and there was an increasing tendency with the decreasing of C/N ratio. 3) Straw retention amended with miner N fertilizer significantly increased crop above-ground biomass. Compared to straw retention and with an adjusted C/N ratio of 25︰1, straw retention with an adjusted C/N ratio of 10︰1 and 16︰1 increased above-ground biomass in both seedling and maturing stage. Compared to straw retention, straw retention amendment with organic N fertilizer had no influence on crop above-ground biomass. Straw retention amendment with miner N fertilizer increased crop yield, especially under the C/N ratio 16︰1 input; however, there was a decreased tendency at straw retention amendment with organic N fertilizer under the C/N ratio 25︰1. We concluded that applying mineral N fertilizer and adjusting C/N ration to 16︰1 may be more suitable N fertilizer practices after straw retention.
- Straw retention,
- Organic N fertilizer,
- inorganic N fertilizer,
- C/N ratio,
- Soil enzyme,
- Soil microbial biomass N,
- Crop yield

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