多年种植蔬菜的地,由于园土老化,地力递减,病虫害也逐年加重,经济效益下降。对于老菜地应采取以下措施进行改良。增施农家肥料,提高土壤肥力。实践证明,常年施用化学肥料,不仅生产成本高,而且还会使土壤板结,降低保肥和供肥能力。应多施农家肥料,改良土壤,增加腐殖质,使耕作层? Years of planting vegetables, due to the aging garden, soil fertility, pests and diseases also increased year by year, economic decline. For the old vegetable should take the following measures to improve. Increase farmers fertilizer to improve soil fertility. Practice has proved that perennial application of chemical fertilizers, not only high production costs, but also the soil compaction, reducing fertilizer and fertilizer supply capacity. Farmers should be applied more fertilizer, soil improvement, increase humus, farming layer?