丘陵山地作土墩栽培柑桔弊大于利。因为柑桔的须根一般呈倒置碟状,面积固定的土墩在柑桔还小时,尚能在土墩的范围里吸收养分;当柑桔长到一定程度,土墩就无法满足柑桔生长的需要。根系就要伸出土墩,裸露在土壤的外部,再加上频繁松土,使须根屡受损伤,更不利柑桔养分的吸收。此外,这样做还容易使肥土流失。因此,丘陵山地作土墩栽培柑桔不可取。 Cultivation of mounds in hilly hills will do more harm than good. Because the citrus fibrous roots are generally inverted dish, mound with fixed area can still absorb nutrients in the mound when the citrus is still young. When the citrus grows to a certain extent, the mound can not meet the growth of citrus need. Roots should extend the mound, exposed in the soil outside, coupled with frequent loosening, so that the fibrous roots often damaged, but also more negative citrus nutrient absorption. In addition, this is also easy to make the loss of soil. Therefore, it is not advisable to cultivate citrus in mound and hillside.