Four technical measures to prevent bean flower and pod shedding

Bean flower buds differentiate a lot, generally each plant can grow about 20 inflorescences, each inflorescence has 4-10 flowers. However, in production, pods only account for 20%-50% of the total number of flowers, and each inflorescence bears only 2-4 pods, and some of them may lose a small pod, which must be controlled.

The reason for the falling flower and fruit of kidney bean: first of all, it is affected by temperature. Under the condition of high temperature above 25 ℃, the flower bud will not differentiate completely. When the temperature exceeds 32 ℃, the pollen growth ability will decrease, even the germination power will be lost, and the flower bud will fall off because it can not be fertilized normally. Secondly, it is the reason of humidity. Due to the continuous overcast and rain during flowering, the air humidity is too high, which leads to the pollen can not be dispersed, or the pollen is broken by Rain Water soaking, which affects the normal pollination and flower drop. Under the condition of strong light and high temperature, the stems and leaves wilted, the flowers and fruits fell more seriously; third, the plant was malnourished, the leaves were yellow and thin, the transport of photosynthates to flowers and pods was blocked, and the flowers and pods fell off due to hunger. Excessive vegetative growth, imbalance between vegetative growth and reproductive growth, clumping of stems and leaves, poor ventilation and light transmission will also lead to serious shedding of flowers and pods; fourth, the harm of aphids and pod borer can also cause falling flowers and fruits.

To prevent flowers and pods from falling off, the following technical measures should be taken:

1. Fertilizer and water management

Thin land should be more rotten organic fertilizer as base fertilizer, combined with available nitrogen and phosphorus fertilizer, must not be partial application of nitrogen fertilizer. Fertile soil should be based on organic fertilizer and phosphate fertilizer, combined with appropriate amount of nitrogen fertilizer. In addition, it is necessary to water reasonably to prevent the imbalance between drought and waterlogging. In general, when flowering, control seedlings to promote pods to water less or no watering, and wait until most pods grow to about 3 centimeters before watering. As some vegetable farmers say, "dried flowers and wet pods." If there is too much rainfall, the stagnant water in the field should be discharged in time, and an appropriate amount of available nitrogen fertilizer should be applied to promote its normal growth.

two。 Reasonable close planting

There should not be too many seedlings in each litter, 3 dwarf species per litter and 2 trailing species per litter, and trailing species should build viaducts in time to allow them to climb up, so as to prevent the field from closing and poor ventilation and light penetration.

3. Biochemical control

Under the condition of normal management, the effect of flower and pod protection is better by using plant growth regulators. During the flowering period, the dwarf bean was sprayed once at flowering stage and sprayed again every 7 to 10 days after treatment with 5~10ppm 's 2.4murd solution, 5~25ppm 's a-naphthylacetic acid aqueous solution, or 1~5ppm 's anticonvulsant. Trailing beans bloom in one batch and need to be sprayed many times. When applying these measures, we should pay attention to the accurate concentration, the solution only deals with flowers, and those who are ready to leave seeds should not be treated with chemical agents.

4. Pest control

Bean flowering period can spray 90% trichlorfon 800x liquid, or 50% fenitrothion 1000 times liquid, to control aphids, bean borer, can achieve good results.