Experiment on Killing Summer Treetop of Citrus Cultivars by "Guonong Bao" Kill Treetop Reagent

ZHANG Yi-jun;XIE Su-jin;DING Ze-chuan;LIN Xiao-na;Chaozhou Fruit Tree Institute in Guangdong Province;

"Guonong Bao";;kill treetop reagent;;tribute citrus;;sugar orange;;Jiaogan;;ponkan;;summer treetop

Citrus is the main variety of Chaozhou city in Guangdong province,and also the main source of fruit growers.In the process of citrus growth,the growth of summer shoots consumes a lot of nutrients,which leads to the contradiction between shoot and fruit,which results in the abscission of fruit and the decrease of yield.In order to regulate the contradiction of citrus fruit with treetop,this experiment selected the "Guonong Bao" killing treetop reagent,using three concentrations of 1000 times liquid,1200 times liquid and 1500 times liquid that process the trender of summer shoots with the tribute citrus,sugar orange,Jiaogan and ponkan separately.The results showed that three concentration of tribute citrus,sugar orange,Jiaogan and ponkan for 10 cm following shoot,killing effect reached 100%.Tribute citrus and sugar orange best treatment concentration was 1200 times liquid and the optimal concentration of Jiaogan and ponkan was 1000 times liquid,the length of the new shoots was controlled below 10 cm.If a small amount of hair was taken from the garden,the pressure was removed manually,wait for the whole park summer shoot out amount reached more than 40%~50% before treatment.