Characteristics of Fruits Load of Different Juglans regia Varieties

In August 2018, the fruit bearing amount and its branch diameter of 8 kinds of walnut varieties named Chuanzao2, Huiyao, Mianhe2, Qingxiang, Shujiang2, Shuoxing, Wen185 and Yanyuanzao were investigated in Sichuan Province. And the characteristics of fruits load were analysis. The results showed that the bearing branch diameter of 8 walnut varieties was in range of 7.0−15.0 mm which accounted for 86.2% of the total number of bearing branches. The number of compound leaf in bearing branches were 5−6 pieces accounted for 30.3% of the total number of branches. There was no significant difference in bearing branches diameter between single-fruit and double-fruit, and they were significant with the bearing branches diameter with three-fruit. There was significant difference among the compound leaf number in bearing branches with single-fruit, double-fruit and three-fruit. In order to maintain normal fruit development and maturity, at least 3−4 leaves were needed for single-fruit, and at least 5−6 leaves were needed for double-fruit and three-fruits. The bearing branches with 1−2 compound leaves should be eliminated the fruitlet because it is difficult to maintain the normal development and maturity of the fruit. The diameter of bearing branches with single-fruit should be more than 7.0 mm, with double-fruit and three-fruits should be more than 8.0 mm which can ensure the fruit develop normally. The bearing branches diameter less than 7.0 mm should be removed, because it almost can't set fruit.