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丘陵红壤由于瘠薄、肥力低、理化性状差、结构不良,特别是有机质缺乏,制约着柑桔生长。桔树根系少且分布浅,侧根多在0～15厘米的表土层,树势衰弱,植株生长不良,易受干旱、冻害威胁。红壤柑桔园套种绿肥是解决有机肥源的可行途径之一。种过绿肥的桔园,只要耕作得当,可以较快地提高土壤中的养分,增加桔树的根量,改变树体结构。
Hilly red soil due to infertility, low fertility, poor physical and chemical properties, poor structure, especially the lack of organic matter, restricting the growth of citrus. Orange root system is less and shallow distribution, lateral root more than 0 to 15 cm in the topsoil, tree weakness, poor plant growth, susceptibility to drought, frost damage. Red citrus orchard intercropping green manure is one of the feasible ways to solve the problem of organic manure. As long as farming well, you can quickly increase the nutrients in the soil, increase the root volume of orange trees and change the tree structure.