近年来柑桔发展迅速,且多集中在土壤瘠薄的山地或丘陵,化肥使用量较大。在给柑桔树追施尿素时,必须注意用量及方法。因为商品尿素中含有一种叫缩二脲的成分,具植物毒性,若使用不当,就会使桔树产生缩二脲中毒。特别是幼龄树,在土壤有机质含 In recent years, the rapid development of citrus, and more concentrated in barren hills or hills, fertilizer use larger. In the citrus tree topdressing urea, we must pay attention to dosage and methods. Because the commodity urea contains a component called biuret, phytotoxicity, if used improperly, it will make the biuret poisoning of orange trees. Especially young trees, containing organic matter in the soil