Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2020, Vol. 36 ›› Issue (22): 69-77.doi: 10.11924/j.issn.1000-6850.casb20190600307

Previous Articles     Next Articles

Combination of Organic Fertilizer N and Inorganic Fertilizer N: Environmental Safety Threshold

Tian Changyu1(), Tang Jiwei1, Li Jianhua2, Zhao Bingqiang1, Xu Jiukai1, Lin Zhi’an1()   

  1. 1Institute of Agricultural Resources and Agricultural Regionalization, CAAS, Beijing 100081
    2The Agricultural and Rural Bureau of Lingcheng District, Dezhou City, Shandong Province, Dezhou Shandong 253500
  • Received:2019-06-20 Revised:2019-11-13 Online:2020-08-05 Published:2020-07-22
  • Contact: Lin Zhi’an E-mail:tianchangyu@caas.cn;linzhian@caas.cn

Abstract:

It is an important technical index for N management and environmental safety to calculate the threshold value of the combination of long-term organic fertilizer N and chemical fertilizer N with wheat-corn rotation. Based on the data of long-term positioning field experiments (2007-2017), we analyzed the change law of total output benefits of wheat and corn with time (the experiments’ results were divided into 3 periods), and calculated the most economical organic fertilizer with chemical fertilizer N and the N threshold. The results showed that: (1) the average yield results of the 7th to 10th year could represented the yield effects of the combination of organic fertilizer and fertilizer; (2) the combination of organic fertilizer N and fertilizer N could increase the threshold of fertilizers N; (3) the optimal fertilizer application amount of organic fertilizer N was determined by the price of organic fertilizer N, the best economic N application under the equivalent conditions of organic fertilizer N and fertilizer N was when the best efficiency of the organic fertilizer N and fertilizer N each was 50%. In conclusion, the organic fertilizer N applied (cow) at the beginning of the test do not fully reflect the fertilizer efficiency; only 7 years later, it could show the combination effect of organic fertilizer N and fertilizer N; the organic fertilizer N combined with chemical fertilizer N could increase the threshold of N.

Key words: organic fertilizer N, chemical fertilizer N, threshold value of N fertilizer, long-term positioning test, environment, economic benefits

CLC Number: