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Acta Prataculturae Sinica ›› 2026, Vol. 35 ›› Issue (6): 35-48.DOI: 10.11686/cyxb2025253

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Production benefit analysis of annual forage rotation systems in an arid area of central Ningxia

Bo SUN1,2(), Jun-yi ZHANG1,2, Chun-yan BAI1,2, Fan FENG1,2, Jian LAN1,2, Jian-qiang DENG1,2()   

  1. 1.College of Forestry and Prataculturae,Ningxia University,Yinchuan,750021,China
    2.Ningxia Grass and Animal Husbandry Engineering Technology Research Center,Yinchuan,750021,China
  • Received:2025-06-26 Revised:2025-09-09 Online:2026-06-20 Published:2026-04-13
  • Contact: Jian-qiang DENG

Abstract:

Compared with traditional monocropping systems, mixed cropping systems can increase crop diversity in rotations. However, whether this approach enhances crop yields and economic benefits remains to be verified. Furthermore, the impact of differing material and energy inputs between mixed cropping systems and monocropping systems on energy utilization efficiency and greenhouse gas emissions remains unclear. Field trials were conducted in 2023 and 2024 using a randomized block design with three treatments: [maize (Zea mays) monoculture (M)], [Sorghum bicolor/Lablab purpureus-maize (S/L-M)], and [Avena sativa/hairy vetch (Vicia villosa)-maize (O/V-M)]. Measurements and analyses were carried out to determine yield (fresh and dry forage yield), economic benefits (output value, costs, and net income), energy efficiency (input-output ratios and energy utilization rates), greenhouse gas emissions (N2O emissions and emission intensity), and ecological efficiency indices [EEIEI (economic ecological efficiency index) and EEIGHG (greenhouse gas emissions ecological efficiency index)]. The results show that, compared with the M model, the S/L-M system increased yield and economic benefits by 157.1% and 93.5%, respectively, with material and energy inputs increased by 127.5%. Labor and seed inputs were the primary drivers of the increased material and energy inputs, being increased by 67.5% and 60.0%, respectively, in the cropping rotation system. However, while the rotation system increased material inputs, it also improved energy utilization efficiency by 211.8%, thereby reducing greenhouse gas emission intensity by 34.6%. Compared with the O/V-M system, the S/L-M system demonstrated superior performance in terms of both yield and economic benefits. Because of its enhanced material and energy utilization efficiencies, the S/L-M system reduced greenhouse gas emission intensity by 15.4% and increased the ecological efficiency index by 16.9%. These results show that replacing maize monoculture with the S/L-M model not only effectively alleviates forage shortages and significantly boosts system yield and economic benefits, but also enhances material and energy utilization efficiencies while reducing greenhouse gas emission intensity. Therefore, this model is recommended for the sustainable development of arid agriculture in central Ningxia.

Key words: arid region, rotation system, mixed sowing, yield, ecological benefits