Nutritious Regulation Of Phosphorus In Paddy Field In The West Of Ji Lin Province

A large area of soda saline alkali soil distribute in the west of Jilin Province. Compare with the other saline alkali soil, the physical and chemical properties of the soil is even worse, the soil is strong alkaline, high salt content, vegetation is difficult to grow. In recent years, with the progress of improved technology on saline alkali soil and the increase of infrastructure investment, the area of soda saline alkali that was developed to paddy field is increasing year by year. But when the problem of how saline alkali soil to be exploited was solved, our next step is to use it more efficiently. The saline paddy fertilization often refer to normal paddy fertilization mode, but because of the high pH value, the nutrient availability of saline alkali soil paddy,especially phosphorus availability,are bound to be different with ordinary paddy field,and conventional paddy field fertilizer applied in paddy field of saline alkali land often leads to low utilization ratio of fertilizer, fertilizer efficiency is poor. With the development of the soda saline alkali soil in the west of Jilin Province, the requirement for the rational scientific fertilization of soda saline alkali land will become more and more urgent. This research is based on the development of saline land into paddy field in western of Jilin Province, the soda saline alkali soil as the tested soil, through field experiments and indoor simulation experiment, study the dynamic changes of different forms of phosphorus in soda saline paddy fields during rice growing period, clarify the effect of phosphorus regulation on different phosphorus fractions in soda saline paddy fields, reveals the effect of phosphorus regulation on nutrient absorption and yield of rice, through the indoor simulation experiment, discuss the effect of soil temperature and pH value on different forms of phosphorus, through the above research, finally clarifies the regulation effect on phosphorus transformation of soda saline alkali paddy field. The main results and conclusions are summarized as follows:1.Under the condition of different temperature,30℃ treatment significantly higher than the other, as the growth of the incubation time,the soil phosphorus is released gradually and the effectiveness of phosphorus gradually increased,the influence of temperature on the morphology of inorganic phosphorus is probably the main performance in Ca2-P、Ca8-P、Fe-P、Al-P Content increases with temperature rise,but the content of Fe-P and Al-P is decreased in the late,O-P and Ca10-P does not change significantly in the whole incubation time.2. Under the condition of different pH value, high pH can depress the release of the available phosphorus content in soil, in the whole incubation period, inorganic phosphorus component Ca2-P,Ca8-P, Fe-P, Al-P content gradually reduce with the increase of pH value,and O-P content is affected a little by the pH,a short period of the pH changes, its content is still remain unchanged, belong to unavailable phosphorus source. Under the condition of different pH value, the component content and change trend of soil inorganic phosphorus is different, illustrate that the soil pH value can influence the transformation of different components of inorganic phosphorus,thus affects the effectiveness of the inorganic phosphorus in the soil.3. Under the different condition of phosphate fertilizer application,phosphate fertilizer application can improve the effective phosphorus source and a potential source of phosphorus content during the whole rice growing period, including Ca2-P, Ca8-P, Al-P, Fe-P and other different forms of inorganic phosphorus; O-P content is higher in the soil and belong to the stability of phosphorus, the O-P content would not change obvious in a rice fertilization reproductive period. Although Ca10-P is thought not available phosphorus in the soil in the past, it can still transformation during rice growing period, higher levels of P application can cause the accumulation of Ca10-P in the soil.4. Under the different condition of phosphate fertilizer application,plant height and dry matter weight increases gradually with the increase of phosphorus application, P4 treatment is highest than the others. In the whole growth period of rice, the content of nitrogen, phosphorus and potassium in rice increase with time gradually increase at later period, and content of the higher phosphorus application is higher than low phosphorus application,rice nitrogen, phosphorus and potassium absorption strength reached the maximum during the late tillering and booting, P4 treatment is higher than the other, high phosphorus content can promote more rice nutrient absorption.5. Under the different condition of phosphate fertilizer application,rice tiller number increases with the increase of phosphoric fertilizer application, the rice tiller number is good for increase the dry matter weight of rice and promote the rice production, rice grains increases with the increase of phosphoric fertilizer application,P3(P2O5 120 kg/hm2)、P4(P2O5 160 kg/hm2) treatment are significantly higher than the others, under this test condition,high phosphorus application is beneficial to increase the rice grains then to increase rice yield.