Effect Of Different Drip Irrigation On Growth Of The Roots And Photosynthetic Properties Of Winter Wheat In North Of Xinjiang

To clarify the relationship between root growth and photosynthetic performance for winter wheat in north of Xinjiang, four different drip irrigation amount treatments i. e. W1 (2550 m3·hm-2?2325 m3·hm-2),W2(3450m3·hm-2?3000m3·hm-2),W3(4350m3·hm-2?3675 m3·hm-2) and W4(5250m3·hm-2? 4350 m3·hm-2),were applied in 2013-2014 and 2014-2015 year under the field condition, to investigate the root length, root weight, root volume and root activity in 0-60cm soil layers, leaf area index, photosynthetic potential, dry matter accumulation and distribution, water use efficiency (WUE), yield and moisture contents in 0-140cm soil layers and so on. To provide theoretical basis for water saving and high yield of winter wheat in north of Xinjiang, the main conclusions are as follows:1. Increase irrigation amount after jointing stage, Increase the depth of moist soil layer, directly increase the moisture content of 0-60cm soil layer and Indirect reduction of water consumption in 60-140cm soil layer in the middle and late stage of winter wheat growth.2. With the increase of irrigation amount, the root dry weight and root length of 0-60cm layer were significantly increased at the jointing stage to the mature stage, because the increase of irrigation amount mainly promoted the root growth of 0-20cm soil layer, and the root growth of 20-60cm soil layer was slightly inhibited. Increase the activity of roots in 0-40cm soil layers from booting to anthesis, W3 and W4 treatment had a larger root volume.3. With the increase of irrigation amount, increase the chlorophyll content and soluble protein content in flag leaf from booting to 20d after flowering. Increasing photosynthetic rate, stomatal conductance and transpiration rate of flag leaf, and decreasing the intercellular CO2 concentration, increasing the leaf area index and photosynthetic potential of winter wheat at the jointing stage to the mature stage, and the total photosynthetic potential of W3 and W4 treatments was higher after the jointing stage.4. With the increase of irrigation amount, increase the dry matter accumulation and photosynthate in the contribution rate to grain from jointing stage to mature stage, at the early stage of filling stage lodging seriously inhibited the contribution of dry matter translocation amount after anthesis to grains. Increase winter wheat yield, But obviously reduce the water use efficiency.5. With the increase of irrigation amount, major improvements the soil moisture conditions in 0-60cm soil layer, promote the root growth and Increase the root activity.To improve the wheat photosynthetic performance from booting and filling, and the reason for increasing the yield is promote the transfer of nutrients to the grain. The recommended water drop of winter wheat under drip irrigation in north Xinjiang is 1800-2025 m3·hm-2 (total water drop is 3450-3675 m3·hm-2), can get the yield of 6737.37-8604.13 kg·hm-2.