Grapes spray fertilizer to increase yield and sweeten
First, before the rapid growth of berries, use 0.4% potassium sulfate solution or 0.3% potassium dihydrogen phosphate solution or 3% straw ash leaching solution for foliar spray; generally spray 2 times is good; generally can increase production by 7% to 10% The sugar content increases by 1.5% to 2.5%.
The second is to spray 0.05% rare earth nitrate solution during the softening period of the berries, and spray twice to increase the sugar content of the fruit by 0.6 degrees.
The third is that when the fruit begins to soften, it can be sprayed with phosphorus and auxin, and the concentrations are 0.05%-0.07% and 0.1%-0.15%, respectively. Spraying requires foliar spray to spray the young leaves and leaf back. It should be sprayed and sprayed until it is completely wet. After spraying, it should be prevented from being exposed to the sun or washed away by rain, so as not to reduce the efficacy.