期刊
AGRICULTURAL WATER MANAGEMENT
卷 248, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.agwat.2021.106764
关键词
Lucerne; Dry matter yield; Forage quality; Irrigation water use efficiency; Flood irrigation; Subsurface drip irrigation; Regulated deficit irrigation
资金
- National Key Research and Development Program of China [2016YFC0400302]
- National Forage Industry Technology System [CARS-34]
Irrigation plays an important role in sustaining agricultural productivity in the arid region of midwestern China. Deficit irrigation can help balance yield and water input, but its effect on alfalfa varies at different growth stages. There is a relationship between plant height and forage yield as well as leaf area index and forage yield. Regulated deficit irrigation can help achieve ideal yield and quality in the area.
Irrigation plays a fundamental role in sustanining the productivity of agricultural systems in the inland arid area of midwestern China. Deficit irrigation can help to balance yield outcome and water input. Few studies have investigated the impact of deficit irrigation on alfalfa performance, which shows great differences from grain crops in water requirement and management strategy. The study aimed to evaluate the effect of regulated deficit irrigation on forage yield and quality of alfalfa (Medicago sativa). A three year trial was carried out with two irrigation systems (flood irrigation, FI and subsurface drip irrigation, SDI) and seven contrasting regulated irrigation treatments, and alfalfa growth, productivity and water use were measured. Under both irrigation systems, alfalfa forage yield decreased with decreasing irrigation amount under whole stage irrigation, while forage quality improved. However, the performance of alfalfa was different when deficit irrigation was applied at various growth stages. Compared with other deficit irrigation treatments, regulated deficit irrigation at single growth stage usually led to a higher yield. There was an exponential relationship between plant height and forage yield (R-2 = 0.62 for FI and R-2 = 0.57 for SDI) and a linear relationship between leaf area index and forage yield (R-2 = 0.56 for FI and R-2 = 0.64 for SDI). There was a negative correlation between forage yield and quality, which was closer to some quadratic relationships. Therefore, regulated deficit irrigation can help to achieve an ideal yield (up to 34.9 t/ha) and quality in this area. In the inland arid area of midwestern China, subsurface drip irrigation showed a higher irrigation water use efficiency (13.8-84.4 kg/(ha mm)) than flood irrigation (10.8-66.6 kg/(ha mm)) for alfalfa production. With limited water supply, deficit irrigation at single growth stage usually maintained a higher forage yield compared to slightly stressed irrigation during the whole growth. Deficit irrigation at the branching stage led to more negative effect on forage yield compared to other single stages.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据