当土壤有机质多或质地偏砂,偏粘的稻田可能缺铜;长期种稻处于淹水条件或复种指数高,又没有铜素补充而导致缺铜,酸性岩发育的土壤也缺铜。在缺铜土壤上增施铜肥对水稻增产幅度大,1982我县示范面积2.500亩,1983年推广2万亩,增产幅度10—20%。施铜亩株增根5.2条,根长增0.93厘米,根鲜重增加8克。苗高增5.3厘米,每丛 When the soil organic matter is more or the soil is sands, the paddy fields with partial sticking may be lack of copper. The long-term paddy is under flooded condition or the multiple cropping index is high, and there is no copper deficiency due to the lack of copper supplement and the lack of copper. In copper deficiency soils increased copper fertilizer on rice yield increase, 1982 I County demonstration area of ​​2.500 acres, in 1983 to promote 20000 acres, increase rate of 10-20%. Copper mu acre increased by 5.2 root, root length increased by 0.93 cm, root fresh weight increased by 8 grams. Seedling height by 5.3 cm, each plexus