What should be paid attention to during the fruitful period of fruit and vegetables in greenhouses?
September 15 02:16:48, 2025
After the low-temperature period, vegetables grown in protected environments enter a productive phase and reach their peak for water and nutrient uptake. It is essential to fully understand the specific needs of these crops during this stage to ensure proper and scientific management.
1. Pay attention to balanced fertilization. During the fruiting stage, the absorption ratio of nitrogen, phosphorus, and potassium differs from that in the earlier growth phase. At this time, more potassium is needed, while phosphorus demand remains stable, and nitrogen demand increases but should be lower than that of potassium. Many farmers mistakenly believe that urea and ammonium bicarbonate can boost fruit production, thinking that higher fertilizer application leads to greater yields. This often results in excessive nitrogen, over-application of phosphorus, and insufficient potassium, leading to poor soil health, unbalanced nutrition, and increased susceptibility to diseases. For example, excess nitrogen may cause large, dark green, thick, and curled leaves, as well as reduced fruit quality or twisted melon strips. Too much phosphorus can lead to deficiencies in zinc, iron, and magnesium because dissolved phosphate binds with these elements in the soil, reducing their availability. A lack of potassium can cause the edges of older leaves to burn, fruits to crack easily, sugar content to drop, flavor to deteriorate, and plants to age prematurely.
To avoid these issues, fertilization during the fruiting stage should follow the principle of applying smaller amounts more frequently, with a focus on potassium. If trace elements are needed, foliar sprays can be used effectively.
2. Monitor greenhouse temperature and moisture levels carefully. As temperatures rise, symptoms like cucumber browning or tomato umbilical rot may appear. These could be caused by iron deficiency. Rapid temperature increases can affect the plant’s ability to absorb water and transport calcium, leading to calcium deficiency at the top of the plant. Adjust greenhouse temperatures promptly to avoid sudden fluctuations, water regularly, and apply calcium foliar sprays when necessary.
3. Be vigilant about the occurrence and control of aphids, whiteflies, and viral diseases. As outdoor temperatures rise, the population of viral vectors such as aphids and whiteflies increases, making pest control crucial to prevent disease outbreaks. Several effective measures include:
1) Install fine mesh nets on all ventilation openings to block pests.
2) Set up a disinfection pool at the entrance of the greenhouse, using quicklime to disinfect footwear.
3) Prepare 0.1% potassium permanganate or 10% trisodium phosphate solution for disinfection before entering the shed.
4) Control aphids and whiteflies using 25% Actara diluted at 7,500–10,000 times, which helps prevent the spread of viral diseases.
By following these practices, farmers can maintain healthy crops, improve yield quality, and reduce the risk of disease outbreaks.
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Water absorbing expansion bag
Denilco water absorbing expansion bag has a wide range of applications and can be used for dam heightening and blockage, water containment and overflow prevention, engineering interception, blockage of hidden ditches and holes, reinforcement of flood control dams at any time, temporary flood control works such as urban waterproof sub embankments and block waterproof walls in flood control and emergency rescue. Before absorbing water, it weighs only 275 grams, and after 2-3 minutes of absorbing water, it can reach 20 kilograms. During emergency rescue, it can replace the soil source and quickly construct rescue projects to reduce losses caused by the lack of soil source on the rescue site and inability to rescue in a timely manner.
Specifications
Name: Non woven water absorbing expansion ba
Model： DP400
Brand： DENILCO ®
Size： 400mm*600mm
Color： White
Outer material：four in one ultrasonic polypropylene non-woven fabric
Built in：hydrophilic nanoscale SAP functional materials
4. Sealing performance: There is no obvious leakage of water absorbing resin debris before water absorption, and the contents do not overflow after water absorption
5. Drop performance: Free fall from a height of 1 meter to a flat concrete floor without damage
6. Sewing thread body: 100% combed fine cotton thread
7. Product weight: 0.27Kg ± 5% before water absorption, 20Kg ± 5% after water absorption
