Acta Agriculturae Boreali-Sinica ›› 2023, Vol. 38 ›› Issue (5): 120-127. doi: 10.7668/hbnxb.20194192

Special Issue: Oil crops Soil fertilizer Cultivation & Physiology

• Tillage & Cultivation·Physiology & Biochemistry • Previous Articles     Next Articles

Study on Suitable Sowing Date of Green Manure for Multiple Cropping Rape after Wheat in Hetao Irrigation Area

LIU Chen1, WANG Weini2, LIAO Shipeng1, REN Tao1, GUO Chen3, LIU Junmei2, SUN Xia2, LU Jianwei1   

  1. 1 College of Resources and Environment,Huazhong Agricultural University,Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) in Ministry of Agriculture and Rural Affairs,Wuhan 430070,China
    2 Ordos Agricultural & Animal Husbandry Ecology and Resource Protection Center,Ordos 017010,China
    3 Plant Protection Institute, Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China
  • Received:2023-04-12 Published:2023-10-28

Abstract:

In order to determine the suitable sowing date of green manure for multiple cropping rape in Hetao irrigation area,field experiments were carried out in Hangjinhou Banner,Bayannur City,Inner Mongolia Autonomous Region in 2019 and Dalad Banner,Ordos City in 2022.There were five sowing dates in Hangjinhou Banner experimental site from July 26th to August 15th,2019,and one sowing date was set every five days,which were sown on July 26th,July 31st,August 5th,August 10th and August 15th,respectively.Similarly,from July 22nd to August 11th,2022,the experimental site in Dalad Banner was set up with five sowing dates,and one sowing date was set every five days to study the effects of different sowing dates on the green manure biomass,nutrient content and nutrient accumulation of rape.The results showed that although the biomass level and climate conditions of the two experimental sites were different,the overall trend showed a decline with the delay of sowing date.Compared with the first sowing stage,the rape biomass in the fifth sowing stage decreased by 90.3% and 75.4% respectively,and the average active accumulated temperature,effective accumulated temperature and sunshine hours in the two-point growth period decreased by 469.9 ℃,409.9 ℃ and 179.1 h,respectively.At the same time,when sowing in the first,second and third stages,compared with the nutrient input (N 27.3 kg/ha,P2O5 34.5 kg/ha),the nutrient input of rape was higher than the input,and the amount of carbon and potassium returned to the field was at least C1 800 kg/ha and K2O 200 kg/ha.Therefore,considering the biomass of rape green manure and the amount of nutrients returned to the field,rape could be sown early after wheat harvest in Hetao irrigation area,making full use of light and temperature resources to promote rape growth and nutrient accumulation.In order to achieve more than 5 t/ha of rape returning to the field and obtain a higher amount of nutrients returning to the field,at least 1 300 ℃ of active accumulated temperature,1 100 ℃ of effective accumulated temperature and 640 h of effective sunshine hours should be accepted during the rape growth period.

Key words: Multiple cropping after wheat, Rape green manure, Sowing period, Biomass, Nutrient accumulation

Cite this article

LIU Chen, WANG Weini, LIAO Shipeng, REN Tao, GUO Chen, LIU Junmei, SUN Xia, LU Jianwei. Study on Suitable Sowing Date of Green Manure for Multiple Cropping Rape after Wheat in Hetao Irrigation Area[J]. Acta Agriculturae Boreali-Sinica, 2023, 38(5): 120-127. doi: 10.7668/hbnxb.20194192.

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