Using Guobaosu on peaches can promote coloring and ripening

Guobaosu is a new type of plant growth regulator, produced and supplied by Shanghai Solvent Factory. In 1991 and 1992, according to trials reported by Li Guangchen and others from the Department of Horticulture at Beijing Agricultural University on peach varieties such as "Zaofeng" and "Okubo", spraying Guobaosu on the leaves 4-3 weeks before the normal harvest period allowed the fruit to color 5-10 days earlier, extremely significantly increased the percentage of colored fruit, and also significantly increased the fruit coloring index. The fruit was very brightly colored, and the fruit ripening period was advanced by 3-10 days. Early harvest did not reduce fruit firmness or soluble solids content, and did not reduce single fruit weight, but could increase the fruit selling price by 0.30-0.80 yuan/kg, with significant economic benefits. The more suitable concentrations for spraying this agent before harvest are: 100-150 mg/kg for early-maturing varieties and 200 mg/kg for mid-maturing varieties.