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脐橙和甜柚是果品中的优良种类,目前在市场上货俏价优,供不应求。因而一些脐橙甜柚的次适宜区在大力发展果业的同时,也将脐橙甜柚作为重点对象发展,而不考虑其对环境条件的要求,大面积栽植。脐橙、甜柚在柑桔中属抗寒性较差的种类,要求极端低温不能低于-5℃,但次适宜区的年极端低温往往都在-5℃以下,一般年份会有不同程度的冻害,遇大冰年份便有毁园的危险,而且橙
Navel orange and sweet grapefruit is an excellent species in the fruit, the current goods in the market are pretty good, in short supply. Therefore, some sub-suitable areas of navel orange sweet pomelo vigorously develop fruit industry at the same time, the navel orange grapefruit will also be the focus of development, without considering its environmental requirements, large-scale planting. Navel orange and sweet grapefruit are the types with poor cold resistance in citrus, which requires that the extreme low temperature can not be lower than -5 ℃. However, the annual extreme low temperature in the sub-suitable area is often below -5 ℃, and the average year will have different degrees Frost damage, in the case of large ice will destroy the danger of destruction of the park, but also orange