Study On The Interaction Mechanism Of SPA And Fertilizer And Soil

This study aimed at the effect of aquasorb fertilizer absorbent mechanism reveals yet sufficiently comprehensive and clear, in fertilizer why will weaken the water-retaining agent restraining soil evaporation and increase the aggregate capacity problems still not accurate answer, fertilizers and water retention agent under the interaction of soil water-energy relation research is still lacking, soil water content after the increase of plant available water increased proportion is not a quantitative answer status. Selected in the northern mountainous areas in China the most widely distributed in the cinnamon soil and currently on the market several common water and fertilizer, through the indoor test and the mechanism of bluegrass pot experiments, try from insurance agent’s own three-dimensional network structure and ionic repulsion, opposites attract as well as ion concentration difference principle analysis of water and fertilizer interaction mechanism, in order to practice in the production of water and fertilizer selection and add fertilizer composite water-retaining agent and provide theoretical support.This paper studies the different water-retaining agents in different fertilizer solution absorbency, followed by study of the fertilizer and water retaining agent mixed fertilization on soil evaporation and soil aggregate effect, then analyzed the fertilizer and water retaining agent under the interaction of soil water energy relation and a water-retaining fertilizer and water conservation effect, finally to bluegrass for research object application effect test.The main results of study as follow:(1) Calcium dihydrogen phosphate solution for five kinds of specifications of the water absorbency of water retaining agent the influence of fertilizer solution than other big, especially the influence to C. The soil contains Ca2-to avoid applying water-retaining agent C, Voight’s model of water-holding agent.(2) Soil moisture cumulative evaporation and evaporation time conforms to power function of Q=atb, a determines the size of initial soil evaporation stages cumulative evaporation trends, B determines the size of water retaining agent restraining soil evaporation ability. Only in soil fertilizer, to a certain extent, can also inhibit soil water evaporation. Water retaining agent can optimize the soil aggregate grading, increased>0.25mm aggregates, and with the water quality concentration increase. Fertilizers, intervention will weaken this ability, and fertilizer concentration becomes high, soil water-stable aggregate content is lower.(3) Fertilizer in the intervention condition, soil saturated water content and water retaining agent concentration with a function of Y=ax+b, R2is in0.95above, a determines the size of the saturation water content variation of amplitude, B for not applying water-holding agent when saturated soil water content. Application of aquasorb fertilizer not only, also will increase to some extent the saturated soil water content, and with the fertilizer concentration increased, soil saturated water content also increased to some extent.(4) Fertilizer in the intervention condition, Beijing cinnamon soil moisture and soil water suction with power function of θ=aS(?)b, the correlation coefficient R2is in0.97above, it has high precision. Fertilizer in the intervention condition, lMPa soil moisture soil water suction is a demarcation point.(5) In the water and fertilizer under the common action of cinnamon soil of Beijing, the water content and not using the water content is proportional to.(6) Soil application of water-retaining agent, N, P, K maintain ability improved to some extent, water retaining agent on nitrogen phosphorus potassium retention capacity from large to small K>N>P. Water retaining agent can significantly reduce the leaching solution volume, but leaching times on soil leaching solution volume effect is not obvious.(7) In the water, decrease soil evaporation, increase the aggregate content, increase the effective water, fertilizer, water retaining agent, with small particle diameter is better than a large particle size.(8) Fertilizer and water retaining agent mixed fertilization can increase the Bluegrass Poa emergence rate, increase plant height, biomass, leaf nitrogen phosphorus and potassium in content, can significantly reduce the bluegrass turf evapotranspiration. Through research the20mm is the least amount of irrigation, and every month can save water resource cost1306.4yuan/ha.