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- Title
Regulation effect of water stroage in deeper soil layers on root physiological characteristics and leaf photosynthetic traits of cotton with drip irrigation under mulch.
- Authors
Luo Hong-hai; Zhang Hong-zhi; Du Ming-wei; Huang Jian-jun; Zhang Ya-li; Zhang Wang-feng
- Abstract
A soil column culture experiment was conducted under the ecological and climatic conditions of Xinjiang to study the effects of water storage in deeper (>60 cm) soil layers on the root physiological characteristics and leaf photosynthetic traits of cotton variety Xinluzao 13. Two treatments were installed, i.e., well-watered and no watering. The moisture content in plough layer was controlled at 70%±5% and 55%±5% of field capacity by drip irrigation under mulch during growth season. It was shown that the water storage in deeper soil layers enhanced the SOD activity and the vigor of cotton root, and increased the water use efficiency of plant as well as the leaf water potential, chlorophyll content, and net photosynthesis rate, which finally led to a higher yield of seed cotton and higher water use efficiency. Under well-watered condition and when the moisture content in plough layer was maintained at 55% of field capacity, the senescence of roots in middle and lower soil layers was slower, and the higher root vigor compensated the negative effects of impaired photosynthesis caused by water deficit to some extent. The yield of seed cotton was lower when the moisture content in plough layer was maintained at 55% of field capacity than at 70% of field capacity, but no significant difference was observed in the water use efficiency. Our results emphasized the importance of pre-sowing irrigation in winter or in spring to increase the water storage of deeper soil layers. In addition, proper cultivation practices and less frequent drip irrigation (longer intervals between successive rounds of irrigation) were also essential for conserving irrigation water and achieving higher yield.
- Subjects
XINJIANG Uygur Zizhiqu (China); CHINA; IRRIGATION water; PLANT root physiology; COTTON growing; IRRIGATION; MICROIRRIGATION; PHOTOSYNTHESIS; CHLOROPHYLL synthesis; SOIL management; CLIMATE change; MANAGEMENT
- Publication
Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao, 2009, Vol 20, Issue 6, p1337
- ISSN
1001-9332
- Publication type
Article