Intercropping planting mode with red soil phosphorus adsorption and desorption balance effect and research method of intercropping planting mode

Abstract

The invention discloses an intercropping planting mode with a red soil phosphorus adsorption and desorption balance effect and a research method of the intercropping planting mode. The planting mode adopts corn and soybeans as intercropping crops, the ratio of planting density of the corn and the soybeans is 1:1, the row spacing between the corn and the soybeans is 50 cm, the plant spacing is 25 cm, and the edge distance is 25 cm. The planting mode has soil phosphorus buffering capability, a large amount of phosphorus is promoted to be desorbed for plants to absorb and utilize under the low-phosphorus level, and phosphorus adsorption is promoted under the high-phosphorus level, so that the loss of phosphorus is effectively slowed down; and according to the invention, the influence of the intercropping and phosphorus application level on the soil adsorption and desorption balance effect is researched aiming at the southwest acid red soil, meanwhile, the internal mechanism influencing phosphorus adsorption and desorption under the intercropping and phosphorus application level is disclosed, and a scientific basis is provided for optimizing reasonable phosphorus application of the southwest acid red soil and improving the effectiveness of a phosphate fertilizer.

Description

technical field [0001] The invention belongs to the field of environmental effects, and in particular relates to an intercropping planting mode with red soil phosphorus adsorption and desorption balance effects and a research method thereof. Background technique [0002] Phosphorus, as one of the three essential nutrients for plant growth and development, is an important nutrient element that limits crop growth and is also an important factor that causes water pollution. The adsorption and desorption characteristics of phosphorus in soil are one of the main mechanisms affecting phosphorus migration and its environmental effects. In my country's farmland soil, due to the strong ability of the soil to adsorb and fix phosphorus, the availability of soil phosphorus is low, and the utilization rate of phosphorus fertilizer by crops is low, and the utilization rate in the current season is only 10% to 25%. Adsorption / desorption affects the absorption and utilization of nutrients ...

AI Technical Summary

Problems solved by technology

Most of the phosphorus applied to the soil will be fixed or adsorbed by soil organic matter, soil clay, amorphous iron, aluminum oxide and other soil minerals, and a large amount of phosphorus will enter the insoluble phosphorus pool, which is difficult to be used by plants

Especially in acidic red soil with strong adsorption, due to the enrichment of iron and aluminum during the formation of red soil, the inorganic phosphorus is mainly Fe-P in closed storage state, accounting for more than 80%, while the soluble and organic phosphorus is less than 20%. Affected by iron, aluminum, manganese and other inorganic colloidal phosphorus fixation, the utilization rate of phosphate fertilizer is only about 10%.

It has been widely reported that intercropping can promote phosphorus uptake and utilization, but the balance effect on soil phosphorus adsorption and desorption is rarely reported, especially the internal mechanism of phosphorus adsorption and desorption under the conditions of intercropping and phosphorus application is still unclear

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