How to prevent grapes from producing small fruits

Small grapes are formed by seed abortion. It is observed that the number of mature seeds of small fruit is equal to that of large fruit, but the seeds of small fruit are all in the tender stage, small but without kernel. If there is a mature seed in the fruit, the fruit can be slightly larger; when there are 2 mature seeds, the fruit can grow to medium size; when there are 3 mature seeds, it can develop into a normal large fruit. 1. Strengthen fertilizer and water management at flowering stage to ensure sufficient nutrients in "critical period of fruit setting nutrition" and "critical period of seed development nutrition" after flowering. 2. From the early flowering stage to the full flowering stage, 0.20% borax solution was sprayed every 7 days for 2-3 times to promote pollen tube germination and improve fertilization rate. 3. Strengthen summer shearing. From the beginning of flowering to the full flowering stage, the heart of the fruiting branch was carried out, and all the lateral secondary shoots were erased at the same time, leaving only one secondary shoot at the top. 7 days later, 1-2 leaves were left to pick the heart of the top secondary shoot, and if the secondary shoot germinated twice, it should be wiped off in time. 4. Pinch the ear tip manually. The flower spike was removed 2-3 days before flowering. This measure has obvious effect on rose fragrance and new rose varieties, with high panicle rate and large tight grain per ear.