There are many flower buds on the inflorescence, and proper flowering and fruiting are the normal physiological phenomena of the grapes. The main reasons are the poor pollination and fertilization, abnormally developed flowers or lack of nutrition and endogenous hormones. However, if the drop is serious, the normal load of grape plants cannot be maintained, which will seriously affect the output of the year and bring losses to the producers. Falling and falling fruits also have a great relationship with the variety, such as the abnormality of the ovule of Kyoho, part of pollen sterility, and its falling and fruiting is related to its own genetic traits. In addition, abnormal climatic conditions are also one of the causes of flowering and fruit falling. For example, low temperature, drought, and rainfall at flowering time directly affect the development and growth of inflorescences. The normal pollination and fertilization process cannot be carried out smoothly, resulting in fruit drop and fruit drop. In terms of cultivation measures, weeding of buds and failure of timely picking of toppings, excessive application of nitrogenous fertilizers, long shoots, long shoots, watering or spraying of flowering plants with pesticides that are irritating to flowers, excessive load in the previous year, and severe disease and insect infestation , New shoots are not fulfilled, flower buds are poorly differentiated, and inadequate storage and nutrition can also result in falling flowers. It is difficult to control the flowering and fruit falling caused by climate anomaly and variety characteristics. However, through scientific cultivation and management techniques, the process of flowering and fruit falling can be reduced. How to prevent the grape falling and fruit dropping technology measures will be briefly introduced as follows:

Reasonable load, improve tree nutrition

Grape vines have large loads and consume many nutrients, and the accumulation of tree nutrients will be reduced. Therefore, controlling production is one of the measures to reduce the number of fallen flowers. Under normal circumstances, the control yield per hectare is 1500 kg, and the maximum is 2000 kg, which can not only ensure high yield and stable yield, but also ensure that the dendrite is fully mature, the flower buds are well-differentiated, and the nutrient accumulation of the tree is sufficient to meet the maximum growth and flowering in the coming year. The need for nutrients for pollination and fertilization. In fertilizer and water management, organic fertilizer should be added. To produce 1 kg of fruit, 4 kg of organic fertilizer should be applied to improve the physical and chemical properties of the soil, create good conditions for root growth, and enhance the absorption capacity of the root system. Post-emergence to flowering, topdressing nitrogen and phosphorus-based quick-acting fertilizers, and timely irrigation according to weather and soil conditions.

Timely buds, twigs, toppings

The timely brushing of buds, twigs and toppings can reduce nutrient consumption, promote the further development of inflorescence, adjust the relationship between vegetative growth and reproductive growth, control vegetative growth, enable more nutrients to be transferred to inflorescence, ensure adequate flowering, pollination, and fertilization. Nutrient supply.

Timely sparse inflorescence

According to the load, the growth of new shoots can be quickly eliminated, and the redundant inflorescences should be removed in time. The left inflorescences should be promptly headed to the spikelets, spikelets and spikelets, so that the supply of nutrients can be more concentrated on the remaining inflorescences to meet flowering and pollination. Fertilization and fruit nutrient requirements.

Spraying boron during flowering

In the two weeks before flowering, spraying 0.3% borax can promote pollen germination and pollen tube elongation, which will have a significant effect on increasing fruit setting and increasing yield.

Exfoliation

Grape girdling should be carried out at the beginning of flowering stage, that is, 3 cm in front of the fruiting branch or in the previous section, girdling with a ring-stripping knife or grafting knife, stripping the mouth 0.2-0.3 cm wide, and reaching deep into the xylem. Stripping immediately with a plastic strip strict, in order to facilitate healing. This method can significantly improve the fruit setting rate, especially for the Kyoho line, the effect is more significant.

Strengthen the prevention and control of early diseases and pests

From the time of budding to when the shoots reach 10 cm in length, the whole park uses Fuxing 8000 times and Wanling powder 3000 times for the second time to clear the park and fight against the thrips and green blind locusts; 3-5 days before flowering, Yibao 1200 is used. Starbucks Star 8000 times, plus Wanling powder 3000 times or Beta-cypermethrin, focus on spraying new shoots and spikes, control black spot disease, cob brown rot, downy mildew and other diseases and pests such as Puma, A. lucorum .

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