After the low temperature period, the vegetables in the protected area entered a period of fruitfulness and entered the peak period of water absorption and fertilizer absorption. Therefore, we should fully understand the requirements of the fruit and vegetable crops during this period so that they can be managed scientifically and reasonably.
1. 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 is needed, the demand for phosphate fertilizer is stable, and the demand for nitrogen fertilizer is increased, but nitrogen is required to be lower than required potassium. Many vegetable farmers believe that urea and ammonium bicarbonate can promote fruit fertilizers, and that the higher the amount of fertilizers, the higher the yield. This results in over-application of nitrogen, excessive application of phosphorus, and insufficient potassium fertilizer during the fruit period, resulting in deteriorating soil and plant nutrition. Unbalanced, 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.
2. Pay attention to the greenhouse temperature and moisture management. As the greenhouse temperature rises, symptoms such as cucumber browning and tomato umbilical rot may sometimes appear. This may be caused by iron deficiency. The temperature of the shed increases too quickly. When the temperature changes violently, it will cause the plants to absorb water. Affecting the transportation of calcium in the plant, causing calcium deficiency at the top, the temperature of the greenhouse should be adjusted in time to prevent the temperature from being flickered, watering in time and spraying with calcium fertilizer in foliar.
3. Note the occurrence and control of aphids, whitefly, and virus diseases. As the temperature outside the shed 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 It is an economical and effective measure to add pest control nets. 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 aphids, whitefly can use 25% Aktai 7500 ~ 10000 times spray, while effectively preventing the occurrence of viral disease.
1. 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 is needed, the demand for phosphate fertilizer is stable, and the demand for nitrogen fertilizer is increased, but nitrogen is required to be lower than required potassium. Many vegetable farmers believe that urea and ammonium bicarbonate can promote fruit fertilizers, and that the higher the amount of fertilizers, the higher the yield. This results in over-application of nitrogen, excessive application of phosphorus, and insufficient potassium fertilizer during the fruit period, resulting in deteriorating soil and plant nutrition. Unbalanced, 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.
2. Pay attention to the greenhouse temperature and moisture management. As the greenhouse temperature rises, symptoms such as cucumber browning and tomato umbilical rot may sometimes appear. This may be caused by iron deficiency. The temperature of the shed increases too quickly. When the temperature changes violently, it will cause the plants to absorb water. Affecting the transportation of calcium in the plant, causing calcium deficiency at the top, the temperature of the greenhouse should be adjusted in time to prevent the temperature from being flickered, watering in time and spraying with calcium fertilizer in foliar.
3. Note the occurrence and control of aphids, whitefly, and virus diseases. As the temperature outside the shed 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 It is an economical and effective measure to add pest control nets. 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 aphids, whitefly can use 25% Aktai 7500 ~ 10000 times spray, while effectively preventing the occurrence of viral disease.
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