Effects Of Long-term Fertilization On Various Species Of Soil K, Ca,Mg And Availability Of Soil

In this study, Long-term trial brown soil fertilizer is applied to research the growth period of soybeans from different fertilizer treatments of soil pH, soil available potassium and calcium and magnesium ion concentration and its vertical distribution in soil, and the soybean plant potassium, calcium and magnesium content in different organs of changing with the height after 36 years long-term rotation fertilization conditions, the main results shouwed that:Top layer of soil, soil available potassium, water soluble calcium and magnesium, exchangeable calcium and magnesium content of soil as the soybean growth period changes significantly, while that of soil acid soluble calcium and magnesium content does not change significantly. Among them, comparing with other growth stages the top layer of soil available potassium content and water soluble calcium and magnesium content is lowest, soil exchangeable calcium and magnesium content is the highest in soybean seed-filling stage.Long-term different fertilization has the greatest influence on soil pH of 0～20 cm soil layer, the soil pH value in soil profile size:20-40cm> 40-60cm> 0-20cm, the pH value among different treatment shows:single organic fertilizer processing> organic fertilizer with nitrogen treatment> control treatment (CK)> nitrogen treatment.Long-term different fertilization on soil available potassium content and soil water soluble calcium and magnesium content in profile showed:with the increase of soil depth, the influence of soil available potassium and soil water soluble calcium and magnesium content gradually reduced.Long-term different fertilization on soil exchangeable calcium, magnesium and acid soluble calcium and magnesium content showed:it is gradually increasing that the influence of soil exchangeable calcium and magnesium content and acid soluble calcium and magnesium content with the increase of soil depth,have the characteristics of leaching in soil profile.In each soybean growth period, plant potassium, calcium and magnesium content in different organs between different fertilizer treatments all showed:organic fertilizer> fertilizer area. (1) during soybean branching stage, different fertilizer treatments of the calcium and magnesium content of plant organs showed:leaf> stem> root, potassium content in plant organs showed:stem> leaf> root; (2) during flowering stage, plant the calcium content in different organs of different fertilizer treatments showed:leaf> stem> pod skin> root, potassium content is:pod skin> leaf> stem> root; (3) during the soybean seed filling stage, different fertilizer treatments of calcium and magnesium content of plant organs showed:leaf> stem> root> pod skin, plant potassium content in the show:pod skin> leaf> stem> root;(4) in harvest stage, plant the calcium content in different organs of different fertilizer treatments showed:pod skin> root> stem> seeds, magnesium content showed:pod skin> stem> root> seeds, potassium content showed:seeds>pod skin> root> stem.Long-term different fertilizer of potassium, calcium, magnesium absorption in soybean plant showed:the influence of organic fertilizer area> fertilizer area.In organic fertilizer processing M2N1P, M2N1PK, M2N1, M2 plant absorption of calcium and magnesium were higher than the corresponding chemical fertilizer treatment N1P, N1PK, N1, CK plant the absorption of calcium, magnesium, and both reached significant difference levels.In organic fertilizer and chemical fertilizer area, potassium application processing (M2N1PK and N1PK) plant absorption of potassium, calcium and magnesium were higher than processing M2N1P and N1P plant absorption of potassium, calcium, magnesium, and both reached significant difference levels...