Strengthen management and prevent vegetable failure

At the moment, the eggplant and melon vegetables in the greenhouse have entered the fruitful period and have entered the peak period of water absorption and fat absorption. Therefore, we should fully understand the requirements of fruit and vegetable crops during this period in order to scientific management.

Pay attention to reasonable fertilization: The proportion of absorption of nitrogen, phosphorus, and potassium in the fruit growth period is different from that in the pre-growth stage. At this time, more potash fertilizer supply is needed. The demand for phosphate fertilizer is stable, and the demand for nitrogen fertilizer is increased, but the nitrogen requirement is low. Need potassium. Many vegetable farmers believe that urea and ammonium bicarbonate can be used as a fruit replenishment fertilizer, and that the higher the amount of fertilizer applied, the higher the yield. This leads to over-application of nitrogen, excessive application of phosphorus, and insufficient potassium fertilizer during the fruit period, resulting in deteriorating soils. Unbalanced plant nutrition, often susceptible to a variety of diseases. For example, when there are too many nitrogen fertilizers, it is often found that the leaves are enlarged, the leaves are dark green, the leaves are thick and hard, twisted, the fruit is reduced or the melon strips are twisted and other salty symptoms. When there are too many phosphate fertilizers, chlorotic symptoms such as zinc deficiency, iron deficiency, and magnesium deficiency will occur because the dissolved phosphate will combine with these elements in the soil and reduce their effectiveness. In the absence of potassium, the lower old leaves appear charred from the edges, the fruits are easy to crack, the sugar content is reduced, the flavor is deteriorated, and the plant premature aging is also caused.

To this end, fertilization in fruit phase should follow the principle of a small number of times, and pay attention to the application of potash fertilizer. When it is necessary to supplement trace elements, it can be carried out by foliar spraying.

Pay attention to the greenhouse temperature and water management: As the temperature of the greenhouse increases, symptoms such as cucumber browning and tomato umbilical rot sometimes appear. This may be caused by iron deficiency. The temperature of the greenhouse may increase too quickly and the temperature may change rapidly. Will cause plants to absorb water difficulties, affect the calcium transport in the plant, cause top calcium deficiency, should promptly adjust the temperature of the greenhouse to prevent the temperature from falling, timely watering and spray with calcium fertilizer.

Pay attention to the occurrence and prevention of aphids, whitefly, and virus diseases: As the temperature outside the greenhouse increases, the number of viral vectors such as aphids and whitefly increases, and pest control should be emphasized to reduce the occurrence of viral diseases.

1 Covering insect nets is an economical and effective measure. Colorless insect nets are added to all ventilation openings in greenhouses.

2 Set up a disinfectant pool at the entrance of the shed, with quicklime for disinfection of the sole.

3 Prepare 1 bottle of 0.1% potassium permanganate or 10% trisodium phosphate disinfectant for disinfection before operation.

4 control maggots, whitefly can use 1% A-dimensional salt 1500-2000 times spray, while effectively preventing the occurrence of viral disease.

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