ACTA AGRICULTURAE BOREALI-SINICA ›› 2020, Vol. 35 ›› Issue (3): 143-152. doi: 10.7668/hbnxb.20190790

Special Issue: Rice Soil fertilizer

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Effects of the Incorporation of Various Amounts of Chinese Milk Vetch and Reducing Chemical Fertilizer on Yield and Nutrient Use Efficiencies in Double Cropping Rice System

CHENG Huidan1,2, LU Yanhong2,3, NIE Jun2,3, ZHU Qidong2,3, NIE Xin1,2, CAO Weidong4, GAO Yajie2,3, LIAO Yulin1,2,3   

  1. 1. Longping Branch, Graduate School of Hunan University, Changsha 410125, China;
    2. Soil and Fertilizer Institute of Hunan Province, Changsha 410125, China;
    3. Scientific Observing and Experimental Station of Arable Land Conservation(Hunan), Ministry of Agriculture, Changsha 410125, China;
    4. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2020-02-16 Published:2020-06-28

Abstract: To explore the suitable application rate and the effect of substitution of chemical fertilizer by Chinese milk vetch, an eleven-year field experiments were conducted, which included seven treatments,CK (no application of Chinese milk vetch and chemical fertilizer), GM22.5 (only Chinese milk vetch application 22.5 t/ha), 100%CF (conventional fertilizer), and the Chinese milk vetch application of 15.0 (GM15.0), 22.5 (GM22.5), 30.0 (GM30.0), 37.5 (GM37.5) t/ha with the application of 60% chemical fertilizer,the effects of different application rates of Chinese milk vetch under the condition of reduced chemical fertilizer on yields and nutrient uptakes, nutrient use efficiencies, soil fertility were investigated. The results showed that fertilization treatment significantly improved the grain yields of early rice, late rice and double-rice compared with CK (P<0.05), with an increase of 79.1%-91.1%, 44.8%-50.7% and 56.8%-64.7%, respectively. Application of only Chinese milk vetch could significantly increase rice yield compared with CK, and the grain yields of early, late rice and double-rice increased by 23.9%, 12.4% and 16.4%. The grain yields of early rice, late rice and double-rice under the application of 60% chemical fertilizer incorporate with various amounts of Chinese milk vetch had no significant difference with conventional fertilizer application. The rice yield was increased with the increasing amount of Chinese milk vetch incorporation within 15.0-30.0 t/ha, however, incorporation of Chinese milk vetch over 30.0 t/ha showed negative effects on crop production. In all the treatments combined Chinese milk vetch with fertilizer, the maximum increases of N, P and K nutrients accumulation in grains of early and late rice were obtained under the treatment of Chinese milk vetch application at 30 t/ha. Compared with conventional fertilizer application, combined applying of Chinese milk vetch with fertilizer significantly improved the recovery efficiency, agronomic efficiency, partial factor productivity of N and K fertilizers. Compared with CK, all fertilization treatments increased the concentrations of soil organic matter, total nitrogen, alkalytic N, available P and available K in varying degrees. The Chinese milk vetch incorporation of 22.5-30.0 t/ha significantly increased the concentrations of soil organic matter, total N, alkalytic N and available P compared with 100%CF treatment(P<0.05).Comprehensively, the long-term incorporation of Chinese milk vetch under the conditions of applying 60% chemical fertilizer in this experiment was conducive to promoting the increase of rice yield and the absorption of N, P and K, and improving N, P and K nutrient utilization efficiency and soil fertility of double rice cropping system.

Key words: Double cropping rice, Chinese milk vetch, Yield, Nutrient use efficiency, Site-specific experiment

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Cite this article

CHENG Huidan, LU Yanhong, NIE Jun, ZHU Qidong, NIE Xin, CAO Weidong, GAO Yajie, LIAO Yulin. Effects of the Incorporation of Various Amounts of Chinese Milk Vetch and Reducing Chemical Fertilizer on Yield and Nutrient Use Efficiencies in Double Cropping Rice System[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2020, 35(3): 143-152. doi: 10.7668/hbnxb.20190790.

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