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棉 花 学 报 Cotton Science 2008 ， 20(1) ： 39-44
Effect of Regulated Deficit Irrigation on Growth and Development Characteristics in Cotton and Its Yield and Fiber Quality Abstract：Under the condition of mobile rain-proof shelter, by cultivating in pots filled with soil, with cotton（Gossypium hirsutum cv. 99B）as material, the experiment in Regulated Deficit Irrigation (RDI), aimed at investigating the effects of RDI on growth and development dynamic of plants, unginned cotton yield and fiber quality, was conducted during the growing season from 2004 to 2006, seeking for the right stages of RDI and the amount of water deficit, offering theoretical basis for the establishment of RDI model in cotton. A two-factor （RDI stages and the amount of water deficit）randomized-block design was adopted in cultivating in pots. The results showed that there was an inducing effect of RDI on amount of roots of cotton distributed in deeper layer of soil. RDI was able to inhibit the excess vegetative growth and promote reproductive growth of cotton. Under appropriate amount of water deficit at some growing stages, the proportion of photosynthetic products distributed in the unginned cotton tended to increase, unginned yield was increased and some of fiber quality indices were improved. The suitable indices of RDI for water-saving and high-yield in cotton as follows: the optimum stage of regulated water deficit is seedling stage, the amount of water deficit is 50%FC (Field Capacity)~60%FC, or regulated water deficit at budding stage, the amount of water deficit is 60%FC, or regulated water deficit at boll-opening stage, the amount of water deficit is 50%FC-55%FC.
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