金堂县是柑桔老产区,不少柑桔树长期生长在土壤瘠薄的山丘地带,表现树冠小、产量低、果实品质较差。而一般采用的逐年扩穴改土的办法,在很薄土层下即见紫色基岩的地方显然是不可取的。为此,自1976年以来,我们在总结农民“放闷炮”的基础上,试验示范柑桔园行间爆破改土,以达到增厚土层,逐步实现树大根深。果多质优之目的。 一.行间爆破改土的方法 在果园两行4株树对角线的交叉点的硬土层或 Jintang County is an old citrus producing area. Many citrus trees grow for a long time in the barren hills of the soil, showing small canopy, low yield and poor fruit quality. However, the commonly adopted method of expanding holes every year is obviously not desirable in the place where purple bedrock is found under very thin soil. To this end, since 1976, on the basis of summing up the “lethargy” of peasants, we tried to blast the soil between the demonstration citrus groves to achieve the thickening of the soil layer and gradually realize the deep rooting of trees. The purpose of high quality fruit. A method of inter-row blasting soil in the orchard two rows of 4 tree diagonal intersection of hard soil or