| Effects of regulated irrigation of lower limits of soil moisture on growth, yield and water use efficiency of spring highland barley |
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| DOI：10.7606/j.issn.1000-7601.2020.01.23 |
| Key Words: spring highland barley regulated irrigation growth soil water yield water use efficiency |
| Author Name | Affiliation | | MENG Qiang | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China | | LIU Jingxia | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China | | LI Yuqing | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China | | ZHANG Wenxian | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China | | PAN Suxiang | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China | | LI Minjie | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China | | NIMA Ciren | Water Conservancy Project and Civil Engineering College, Tibet Agriculture and Animal Husbandry University, Linzhi， Tibet 860000, China |
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| Abstract: |
| To explore the regulated irrigation mode benefits to the growth and yield of spring highland barley in Nyingchi valley areas, a field plot experiment was carried out with the spring highland barley species “Himala 22”. Five lower soil water limits, including 80%~85% θf (W1), 75%~80% θf (W2), 65%~70% θf(W3), 55%~60% θf(W4), and 45%~50% θf(W5), and one control treatment (rain\|fed irrigation, CK) in the whole growing season to study the effects of soil water regulation on spring highland barley growth, water consumption, dry matter accumulation, and yield. Results showed that the irrigation treatment had significant effects on plant height of the spring highland barley in the middle and late stages. Comparing with CK treatment, the plant height at heading stage and milk stage increased by 37.28% and 44.33% respectively. After heading stage, the leaf area per plant of W1, W2, and CK treatment decreased, and the average decay rate was 0.20 cm2·cm-2·d-1). The relative growth rate of leaf area was significantly negative after milky stage. The total water consumption during the growth period of spring barley decreased sharply with the decrease of the lower soil water limits, and the water consumption intensity basically floated around 5 mm·d-1. Comparing with CK treatment,the irrigation treatment increased the drymatter accumulation of the spring green by 13.95%, and a big rate of increase amplitude appeared in heading stage. With the decrease in lower soil water limits，the yield and water use efficiency in all treatments increased first and then decreased. The water use efficiency and crop harvest index of W4 treatment were 1.15 kg·m-3 and 0.40, respectively, significantly higher than that of W1（0.28 kg·m-3, 0.28）and W2(0.91 kg·m-3,0.30). Meanwhile, the treatment W4 obtained the maximum yield (6 237.05 kg·hm-2) under lower irrigation volume(252.52 mm). Comprehensively considering the water saving and high field, the lower soil water limit of 55%~60% θf is optimal to agriculture of the Nyingchi valley under the present experimental conditions． |
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