Relationship Of Soybean Root Growth And Flower-pod Formation Under Different Irrigation Quantities

The project aims to provide the relationship of root growth and flower-pod formation of the high yield soybean. In the field, there were four different drop irrigation amount treatments i.e. W1(900 m3·hm-2),W2(1725 m3·hm-2),W3(2250 m3·hm-2)and W4(3375 m3·hm-2),and author studied systematically the effect of soil moisture content in 0-120 cm and to prove the relationship among the root growth, free amino acid content, photosynthetic characteristics and dry matter accumulation, flower and pod formation and to root dry weight, yield and consumption characteristics of the water. Mainly obtains the following research results:1. Increase the volume of water dripping contents in 0-40 cm soil water of upper limit and lower limit of the significant effect, influence of 40-60 cm soil layer was not significant, 60-120 cm soil moisture content is still a downward trend; mainly promote 0-40 cm root dry mass density and length of lateral roots growth, resulting in total root dry mass and total lateral root length increased, 40-80 cm soil layer, root of dry mass and root length had no significant effect.2. Flower stage, the ASP content was the highest, about 16.13%, Glu, Leu, Lys content times; full pod stage increased drip loss is conducive to promote plant growth, delay the senescence of plant. At the same time, also delayed the synthesis of carbohydrates, lipids, and a variety of amino acids, reducing the resistance of the plants. Podding stage, with the increasing of water content, root ASP, Leu and Arg, Glu, Lys and 5 kinds of amino acid content increased to provide the amino acids needed for the formation to the upper kernels; ASP and Glu content increase can promote the roots to the transport of some amino acids.3. Significantly increased soybean growth period in the sixth and ninth leaf PN, TN, GS and Ci, help spring soybean moisture exchange, reduce ineffective water loss; spring soybean photosynthesis and dry matter accumulation was significantly increased. Increasing the dry matter weight, total dry matter accumulation and leaf area index of the dry matter, mainly to increase the dry matter accumulation and leaf area index of 7-15 and the 10-15 segment weight.4. A significant increase in total number of flowers, mainly is the increase in the number of the 10-15 nodes; to extend the flowering period and delayed beginning pod appear to date, and extended the period of pod, increase pod nodes. Flowering and podding stage 0-80 cm soil root dry mass increment, root length increment and bleeding potential and pod number are available linear regression equation to simulate, the correlation coefficients were 0.900 1 and 0.804 5, 0.970 8(P < 0.05).5 the important reason for increasing the quantity of water in the flower and pod period is to promote the growth of root system, increase the number of flowers and pods, and then achieve the goal of increasing the yield of soybean. Xinjiang Yining spring soybean full flowering first irrigation, podding mid end drop water, four times during the growing period of water, every drop of water 675.0-900.0 m3·hm-2, total water volume 2 550.0-3375.0 m3·hm-2, can yield 5 388.3-5 48.36 kg·hm-2, total root dry mass peak is 130.98g·m-2, total root length peak for 560.93m·m-2, the total number of flowers for 3 000.4-3 42 flower·hm-2, the total number of cavities for 2436.5-2 978.8·hm-2, water use efficiency(WUE) 0.88-0.96 kg·m-3 and irrigation water use efficiency for 1.62-2.11 kg·m-3 and irrigation water use efficiency is most appropriate.