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Title:: Effect of Drip Irrigation Quantities on Roots Growth and Formation of Flowers and Pods in Soybean

Keywords:: Soybean; Drip irrigation; Super-high-yield; Root; Flower number; Water use efficiency

Abstract:: ?Several soybean yield records are obtained in Xinjiang under irrigation in recent years. However, the response of soybean root growth and yield formation to drip irrigation are less documented. Soybean cv. Zhonghuang 35 was planted in Yining, and four total irrigation amount of 1 477.5, 1 852.5, 2 227.5 and 2 602.5 m³·ha^-1were applied. Increasing irrigation amount enhanced lower limit of water content in 0-40 cm soil layer and total water consumption, decreased storage water consumption in 60-100 cm soil layer, increased root dry weight density, lateral root length density and bleeding sap amount at each growth stage, promoted total flower, cavity and seed number, ratio of cavity to flower, as well as seed weight. Hence, increased yield and water use efficiency (WUE).The highyielding and watersaving effect of appropriate drip irrigation attributed to establishing welldeveloped roots and increasing total flower number and cavity to flower ratio from flowering to podding stage. Treatment of irrigation 2 602.5 m³·ha^-1 obtained highest yield of
6120 kg·ha^-1, and the peak of root dry weight and lateral root length was 137.37 g·m^-2 and 740 m·m^-2; total flower, cavity and seed number were 3 .707, 3.159and 2.868×10⁷·ha^-1, respectively; cavity to flower ratio was 0.85 and WUE was 1.47 kg·m^-3. The suitable quantities of drip irrigation for spring soybean was about 2 602.5 m³·ha^-1 in Yining region.
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