Coupling Effects Of Water And Fertilizer Field Experiment On Jujube In Extremely Arid And Desert Region

Water shortage and lack of soil nutrient are the key limiting factor restricting the development of horticulture in south of Xinjiang arable area. How to maximize the comprehensive efficiecy of water and fertilizer is a pressing problem. In this test, taking Jun jujube as research object, choosing drop irrigation water, pure nitrogen, pure phosphorus content and pure potassium content were factors tested using quadratie orthogonal rotation combination design. The field experiments were investigated in Tarim university test base. Research of the influence on temporal and spatial variations of soil moisture and nutrients in Jujube tree root zone, jujube leaf growth and Jujube leaf nutrient absorption by water and fertilizer coupling was carried out. The main conclusions are as follows:1. On the water and fertilizer coupling condition, the soil moisture and nutrients changes is consistent with jujube growth period and different in space. The relationship between water and fertilizer is obvious; they are mutually promoted, mutual assisted and complementarily coupled, mutual controlled and mutually feedback. The leaching effection on soil nutrient is significant, especially on nitrate leaching.Taking promoting fertilizer from water conservation into consideration, this research is preliminarily believed that the treatment of the drip irrigation water was 130 m~3/acre, pure nitrogen 5.5 kg/acre and pure potassium 8.25 kg/acre during the whole phase of growth, in other words, water, nitrogen and potassium combinations can promote water conservation and fertilizer.2. While the Quadratie Orthogonal Rotation Combination Design was designed, the mathematical model between irrigation, pure nitrogen, pure phosphorus and pure potassium content and the contents of alkali-hydrolyzed nitrogen, total phosphorus and total potassium in leaf were formulated. The comprehensive analysis showed that appropriate irrigation quantity and fertilization ratio for the whole growth period was drip irrigation water 130 m~3/acre, nitrogen: phosphate = 2:1, but the ratio of potash is various. The effect of fertilizer was greater than water.3. When fertilization ratio was N:P:K=1.3:2:1, drip irrigation water was 185 m~3/acre, pure nitrogen content 2.75kg/acre, pure phosphorus content 4.13 kg/acre and pure potassium content 2.06 kg/acre during the whole growth period. Jujube trees growed best. Vegetative growth of jujube was more sensitive to phosphate. More nitrogen and phosphate fertilizer had significant effect on the Jujube growth.