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Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (11): 158-171.DOI: 10.11686/cyxb2021350

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Irrigation scheduling based on yield and quality in Bromus inermis

Yuan-bo JIANG(), Yan-xia KANG, Guang-ping QI(), Min-hua YIN, Yan-lin MA, Jing-hai WANG, Qiong JIA, Yao KANG, Hong-bin ZHANG, Zhong-xia TANG, Ai-xia WANG   

  1. College of Water Resources and Hydropower Engineering,Gansu Agricultural University,Lanzhou 730070,China
  • Received:2021-09-22 Revised:2021-11-03 Online:2022-11-20 Published:2022-10-01
  • Contact: Guang-ping QI

Abstract:

A suitably calculated irrigation regime can improve the productivity of artificial grassland, improve the quality of pasture and enhance water use efficiency in drier areas. In this research we compared the effects of two irrigation regimes (regulated deficit irrigation at different growth stages, I1; regulated deficit irrigation over the whole growth period, I2) on yield and quality of Bromus inermis in the Hexi Corridor. Irrigation scheduling was optimized by considering the results of field trials and simulations of irrigation scheduling in typical dry years to provide a theoretical basis for local production practices. The results showed that: The yield of B. inermis in I1 initially increased and then decreased with successive increases in the amount of water applied, while in I2B. inermis yield showed an increasing trend across the range of irrigation rates tested. In both irrigation regimes, the crude protein content of B. inermis gradually decreased with increasing water supply, while the acid detergent fiber and neutral detergent fiber contents increased somewhat. Compared with I2B. inermis yield was increased by 23.11% on average and crude protein content by 6.09% on average in I1; therefore, the I1 irrigation regime was superior. Based on the field trial combined with the simulation of irrigation scheduling in a typical dry year, it was found that a treatment designated [greening stage (75%-85% θFC), jointing stage (65%-85% θFC), and tasseling stage (65%-85% θFC) , I1DF1], irrigation frequency of 12 times, and a total irrigation amount of 521.76 mm provided water-saving benefits and stable yield in B. inermis in the Hexi Corridor.

Key words: Bromus inermis, yield, quality, water regulation, irrigation scheduling