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Effects of water storage in deeper soil layers on growth, yield, and water productivity of cotton (gossypium hirsutum l.) in arid areas of northwestern china
- Luo, Honghai, Zhang, Hongzhi, Han, Huanyong, Hu, Yuanyuan, Zhang, Yali, Zhang, Wangfeng
- Irrigation and drainage 2014 v.63 no.1 pp. 59-70
- Gossypium hirsutum, cotton, crop yield, field capacity, flowering, leaf water potential, leaves, microirrigation, photosynthesis, planting, surface area, water management
- In order to understand how the available water stored prior to planting (ASWp) affects cotton yield and the relative physiological parameters, we designed two ASWp levels in columns, well‐watered (P₉₀) and no watering (P₀), combined with different water management scenarios during the cotton‐growing period, 70% of field capacity (FC) during the third leaf to boll opening stage (I₇₀) and changed the third leaf to flowering stage in 55% of FC and 80% of FC thereafter (I₅₅‐₈₀). P₉₀ enhanced root length density (RLD), surface area density (RSD), and root activity, which in turn increased the efficiency of ASWp usage. A significantly higher leaf water potential, net photosynthesis rate, above‐ground dry matter (DM), and yield were found in P₉₀ than in P₀. Under well‐watered conditions, I₅₅‐₈₀ had a higher RLD in the 40–120 cm layer compared with I₇₀. However, root mass density (RMD) and DM in I₅₅‐₈₀ were significantly decreased that led to marked decreases in yield and, to a lesser extent, in water productivity (WP). Under no watering conditions, yield and WP were significantly increased in I₇₀ relative to I₅₅‐₈₀. It showed that sufficient water in deeper soil layers and a sustained 65–75% of FC could be an appropriate drip irrigation mode for the local cotton field.