柑桔是多年生常绿果树,需要氮素营养多,因此,柑桔园施用氮肥的次数多且量大。据资料报道,世界各地的氮肥利用率很低,一般只有30—50%左右。杨村柑桔场处于高温潮湿丘陵地区,硝化及反硝化微生物活动频繁,氮肥的损失是严重。研究柑桔对氮肥的利用情况,提高氮肥利用率,具有一定的实际意义。据报道,氮肥增效剂与氮素化肥混合施用,能提高农作物对氮肥的利用率;添加氮肥增效剂比单施化肥水稻增产7.4%,小麦增产10.6%,棉花增产12.4%,橡胶增产11.5%。 Citrus is a perennial evergreen fruit tree, requiring more nitrogen nutrients, therefore, the citrus orchards use more nitrogen and large quantities. According to the information reported, nitrogen fertilizer utilization rate is very low around the world, generally only about 30-50%. Yangcun citrus field in high temperature and humid hills, nitrification and denitrification microorganisms frequent, the loss of nitrogen is serious. It is of practical significance to study citrus utilization of nitrogen fertilizer and increase nitrogen utilization rate. It is reported that nitrogen fertilizer synergist and nitrogen fertilizer mixed application, can improve crop utilization of nitrogen fertilizers; nitrogen fertilizer synergist than single fertilization rice yield 7.4%, wheat yield 10.6%, cotton yield 12.4%, rubber yield 11.5 %.