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我县地处柑桔栽培的北缘,栽培品种99％为较抗寒的温州蜜柑。温州蜜柑虽然抗寒性和丰产性较强,但由于果实无核,座果率较低。因此,提高座果率是温州蜜柑丰产栽培的一项关键措施。过去对喷外源激素、环割等提高座果率研究颇多,但对受环境条件直接影响的树体生长情况与座果率的关系研究较少。我县1984年冬低温早临,1985年春花期前后气温变化剧烈,阴雨多、日照少的异常气候条件造成温州蜜柑大量落叶。往年在花期喷50ppm赤霉素加0.3％尿素和0.2％磷酸二氢钾,落花落果可以减少,1985年即便喷了药,落花落果仍然严重。如
My county is located in the northern edge of citrus cultivation, cultivar 99% of the more resistant to cold Satsuma. Wenzhou Satsuma Although cold hardiness and high yield of strong, but because the fruit of non-core, low fruit set rate. Therefore, increasing the rate of fruit set is a key measure of Wenzhou Satsuma high yield cultivation. In the past, there were a lot of studies on the increase of fruit-setting rate by spraying exogenous hormones and circumcision, but there was little research on the relationship between the growth of fruit trees and the fruit-setting rate directly affected by environmental conditions. Cold early winter in 1984, the county early spring, spring 1985 before and after the dramatic temperature changes, more rainy, less sunshine and unusual weather conditions caused a large number of leaves of Wenzhou Satsuma. In previous years, sprayed with 50ppm gibberellin plus 0.3% urea and 0.2% potassium dihydrogen phosphate in flowering stage, the number of fallen and fallen fruit could be reduced. In 1985, even if the medicine was sprayed, the fall and fall of fruit was still serious. Such as