What are the reasons why tomatoes fail to set fruit in the later stage
For tomato blossom-end rot, integrated measures focusing mainly on cultivation practices should be adopted for prevention and control. These include: (1) Select disease-resistant varieties: varieties such as Qiguo, Changchun No. 1, and L-402 are relatively resistant. (2) Water at the right time: a balanced supply of water must be ensured. Especially during the fruiting period, pay even more attention to a balanced water supply; in drought...
Applying trace elements, usually this type, gives tomatoes a very good fruit-setting rate in the early stage. Usually the early fruit is on the large side. Do not apply water and fertilizer too early in the early stage, do not promote fruit swelling too early, and keep as few fruits as possible in the early stage. In the early and mid stages, use more trace elements; for the macro element phosphorus applied in the early stage and seedling stage, diammonium per mu should not exceed 40 jin; at the flowering stage and young fruit stage, use a little Shanghai Yongtong monopotassium phosphate for foliar spraying two to three times, and that is enough. When applying base fertilizer, use a little Kuimida, whose trace element ratio is very good - boron, calcium, magnesium, sulfur, potassium. At the second cluster of fruit, then begin to increase the amount of water and fertilizer. To make flower bud differentiation good, do not use too little phosphorus and calcium. Strengthen water and fertilizer management and pay attention to fertilizer quality. At the flowering stage, use a little high-phosphorus fertilizer and apply it as a drench just once - [15, 30, 15], no more than ten jin of fertilizer per mu, and that is enough. When the second cluster of fruit grows to the size of a small chicken egg, use a balanced fertilizer once - [20, 20, 20], ten jin per mu. At the third cluster of fruit, use [14, 7, 28] once, 15 jin per mu, which cannot be less; after seven to ten days, add another application of [12, 5, 40] once more. It is best to use it together with bacteria for the best effect. In this way your empty clusters can be solved. In short, it still comes down to fertilizer, water, and management.