Research On Water-fertilizer Coupling On Cotton Plant In Condition Of Drip Irrigation In Arid Area

Water shortage and lack of nutrients are two key factors which restrict production in the drought masses of farms. Both at home and abroad have done a lot of research about how to effectively control the two factors, to get high-yielding, high-quality and efficient production purposes. This paper though drying method and neutronprobe to measure soil moisture content of different growth stages, measured the cotton length and leaf area index at the same time. Measure the unginned cotton yield, dry matter yield, boll weight and bolls of 100 plant cottons, detialed record length of child-bearing period. The reseach has drawn the following main conclusions:1. Underground drip irrigation water and nitrogen is a key element in the growth of cotton, reasonable water and fertilizer can increase cotton production. Water shortage affects crops on nutrient absorption and lower crop yield, lack of nutrients not only lowers the output of crops, but also restricts crops fully absorbing water. Cotton biological characteristics can be improved under reasonable irrigation add nitrogenous.2. Cotton production of dry materials increase at first then decrease under less irrigation along with the increase in fertilizer, when the crops are not under dry conditions, the dry material production basically is increased with the increasing in fertilization. When the crop with excessive irrigation, with the fertilization increased the production of dry material increased significantly. Under fertilization in certain quantity, with the irrigation increased the production of cotton dry materials is basically increased firstly and then decreased.3. Fertilization is the major factor which affects the cotton boll weight, when the irrigation is on the right conditions, reasonable increase in the use of nitrogen fertilizer can increase cotton boll weight; Along with the fertilizer increasing, the velocity of cotton boll weight increasing changes from fast to slow. As fertilization under certain conditions, with the increase in irrigation cotton boll weight changes a little.4. Irrigation under certain conditions, the bolls of 100 cotton plants increase obviously first and then decrease along with the increase of fertilization. Fertilization under certain conditions, the bolls of 100 cotton plants have the same trend as above.5. Growth Period length and irrigation-fertilization basically are positively correlated. When a certain amount fertilization, the cotton growth period length increased with the irrigation increased; In the low level irrigation, the length of cotton growth increase obviously first and then reduce. In the high level irrigation the length of cotton growth period increased with the water increased.6. The effect of nitrogen fertilizer on production increasing is stronger than that of irrigation, the increased range of nitrogen is narrow, the increased range of water is broad. According to the yield regression equation, when the irrigation is 296.6m3/667m2,fertile 38.7kg/667m2 the cotton production is the most, and the most harvest is 305kg/667m2.