夏橙(伏令夏甜橙)是甜橙的一个优良品种。它在开花后的第二年4—5月成熟,此时正是一般柑桔的商品淡季,因而具有特殊的商品价值。伏令夏橙在四川栽培上的主要问题是冬季落果。我们曾对落果原因和保果方法进行了观察和试验,现将结果介绍如下:一、夏橙冬季落果的生物学落果规律与气候条件的关系:夏橙果实在 Summer orange (summer green orange) is a sweet orange varieties. It matures in April-May of the second year after flowering, which is exactly the off-season of the general citrus and thus has a special commercial value. The main problem that summer orange is cultivated in Sichuan is the winter fall fruit. We have on the causes of falling and fruit preservation methods were observed and tested, the results are as follows: First, the summer orange fall fruit biological drop rules and climatic conditions: summer orange fruit