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良好的土壤物理环境,是农业高产稳产的基础。通过9年定位研究阐明,红壤性水稻土无机肥连施特别是偏施,随着有机和无机胶结物质的数量减少,土壤结构性遭受破坏,容重增值,孔隙度降低,水稳性结构破坏率提高,微团聚体分数系数上升,致使土壤紧实,耕性变坏,土壤肥力衰退。无机肥与有机肥配合施用能有效地提高作物产量,改善土壤物理环境,为建立优化施肥结构展示了良好前景。
Good soil and physical environment, is the basis of high and stable agricultural production. Through 9-year positioning study, it was clarified that the combination of inorganic fertilizers, especially partial fertilization, on paddy soils increased with the decrease of the amount of organic and inorganic cementitious materials, the damage of soil structure, the increase of bulk density, the decrease of porosity and the failure rate of water-stable structures Increasing, the microaggregate fractional coefficient increases, resulting in soil compaction, deterioration of soil fertility, and decline of soil fertility. Combined application of inorganic manure and organic manure can effectively increase crop yield, improve soil physical environment and display good prospects for establishing optimized fertilization structure.