澳大利亚的兰吉洛克与柯利南,有一些柑桔生产者在柑桔树的行间种植紫花苜蓿,作为一种土壤管理的方法。大多数是在用杀草剂除过草的果树边缘种植紫花苜蓿。普通的苜蓿类只能在冬季生长,然而紫花苜蓿却能周年地复盖土壤,防止风和雨水的浸蚀,特别对轻沙土壤更是这样。紫花苜蓿是一种豆科植物,它能供给土壤一种天然的氮素来源。这种氮素可以周年缓慢地释放出来,而不易淋失。在一个柑桔园建成的最初几年中,紫花苜蓿的深根系统能使果树行间过多的地下水位降 In Lanjirouk and Colinan in Australia, some citrus producers planted alfalfa between lines of citrus trees as a means of soil management. Most are planted with alfalfa on the edges of fruit trees that use herbicides to pass grass. Common alfalfa species can only grow in winter, alfalfa, however, can cover the soil on an annual basis, to prevent the erosion of wind and rain, especially in light sandy soils. Alfalfa is a legume that supplies soil with a natural source of nitrogen. This nitrogen can be slowly released each year, but not easy to leaching. In the first few years of the construction of a citrus grove, the deep root system of alfalfa allowed too much groundwater table fall