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一、整地问题整地是一项细致的基础工作,它的好坏从根本上影响着整个幼苗时期的生长和发育。不合理的整地会使土壤结构遭受破坏,降低土壤有效养分,妨碍幼苗生长,增加病害危害性,如1957年会同金坪苗圃,在一块土壤含水量过大的圃地上整地,因人为的践踏和工具的影响,使土壤变得坚实,有效养分降低(氨态氮降低1/4,有效磷降低1/2强),苗木产量少,质量差,其效果与同一土地而水分较小者此较如下表:
First, the problem of site preparation Site preparation is a careful foundation work, its quality fundamentally affects the entire seedling growth and development. Unreasonable soil preparation will cause damage to the soil structure, reduce soil available nutrients, impede the growth of seedlings, increase the hazard of diseases, such as 1957 with the Jinping nursery, in an area of soil moisture is too large land preparation, due to human trampling and Tools to make the soil become solid, reduce effective nutrients (ammonia nitrogen to reduce 1/4, 1/2 lower effective phosphorus), seedling yield less, poor quality, the effect of the same land and less water than those The following table: