重庆市歇马公社人和大队平桥生产队的丘陵紫色土,母质为砂岩,表土只有5—10厘米,不宜柑桔根系生长。如在这种丘陵地上建立柑桔园,应爆破改土1米深,单株营养面积应在8立方米以上。1968年冬该队爆破改土,1969—1970年定植锦橙(红桔砧)573株,1974年平均株产9斤,1975年增至18.7斤,亩产1,028.5斤。他们爆破改 Chongqing City, Reebok commune people and brigade Pingqiao production team of purple hills soil, the parent material is sandstone, topsoil only 5-10 cm, citrus root growth should not be. Such as the establishment of citrus orchards on such hilly ground, blasting should be 1 m deep soil, nutrient area per plant should be 8 cubic meters or more. In the winter of 1968, the team decontaminated the soil. 573 strains of Jincheng (red orange anvil) were planted in 1969-70. The average strain produced 9 pounds in 1974 and 18.7 kg in 1975, yielding 1,028.5 kilograms per mu. They burst changed