[Response of grain-filling properties and quality of winter wheat to drip irrigation in Xinjiang, China].

To provide theoretical basis for the water-saving, high-yield and good quality cultivation techniques of drip-irrigated winter wheat, the wheat cultivar 'Xindong 22' was adopted as the test material, and five irrigation amounts including 3150 (W ₁ ), 3900 (W ₂ ), 4650 (W ₃ ), 5400 (W ₄ ) and 0 (CK) m ³ ·hm ^-2 were adopted to investigate effects of drip irrigation amount on grain filling dynamics and quality traits in 2012-2013 and 2013-2014 wheat growing seasons in Xinjiang. Results indicated that the grain-filling dynamics of drip-irrigated winter wheat in different treatments presented the "S" shape curve, and accorded with the Logistic model with high fitting degree. The fast increase period of wheat grain-filling was measured at 12-20 days after anthesis. The maximum filling rate (V _m ) increased at first and decreased later with the increase of drip irrigation amount, and was obtained in the treatment W ₃ in the two seasons, which was 2.16 g·d ^-1 and 2.59 g·d ^-1 , respectively. With the increase in drip irrigation amount, the bulk mass, protein content, flour extraction rate, wet gluten content, dough stability time, degree of softening, dough extension resis-tance and draw ratio of the drip-irrigated wheat firstly increased and decreased later, and the maxima of these indexes were measured in W ₃ . However, the water absorption rate and extensibility of dough initially decreased and then increased, and the minimum was obtained in the treatment of W ₃ . The sedimentation value increased gradually and the dough development time decreased progressively. Treatment W ₃ had the highest grain yield of 8913 kg·hm ^-2 in 2013 and 8602 kg·hm ^-2 in 2014, which was 25.0%, 14.8%, 4.4%, 35.6% and 12.4%, 2.8%, 1.1%, 33.0% higher than the treatments of W ₁ , W ₂ , W ₄ and CK in 2013 and 2014, respectively. In conclusion, drip irrigation of 4650 m ³ ·hm ^-2 during the whole growing season of winter wheat could realize the target of high-yield and good quality in local natural condition.