How do watermelon seedlings survive safely? What are the key points of fertilization technology?

Watermelon is one of the fruits often eaten in summer. It is not only juicy, but also sweet and popular. Especially in the hot summer to eat a few mouthfuls of ice watermelon, very summer heat to quench thirst. Now that the temperature is very cold, how can the watermelon seedlings survive the winter safely? What are the key points of fertilization techniques?

First, how can watermelon seedlings survive the winter safely?

In order to improve the heat preservation and heating measures of watermelon seedling shed, polycyanoethylene non-dripping film is used instead of polyethylene film, the heat preservation and performance are greatly improved, and the greenhouse temperature can be increased by 1 ℃ ~ 2 ℃. Temporary heating equipment such as fire wall or heating furnace should be installed in the greenhouse. Artificial warming should be carried out when necessary.

1. Strengthen seedling management.

The wound healing stage is within 1 week after grafting, the greenhouse temperature should be kept at 20 ℃ ~ 30 ℃, the grafted seedling bed should be strictly sealed for 3 to 6 days, and the relative temperature in the bed should be maintained. It should be completely shaded in the first 3 days, only through weak scattered light, and gradually see light on the 4th day, gradually ventilated after 6 days, remove the shade and increase ventilation after 7 days, and timely foliar spraying fragrant or active carbon to improve the ability to resist natural disasters and increase the intensity of photosynthesis. Make the grafted seedlings adapt to the normal seedling bed environment.

2. Strengthen the management of disastrous weather

The management of severe weather such as continuous overcast, rain and snow, strong cold spell and so on is an important link in the success or failure of seedling breeding. Pay attention to listen to the weather forecast in winter and take measures to keep warm and warm before the cold spell comes.

Second, what are the key points of fertilization techniques for watermelons?

1. Fertilization in nursery bed

The nutrient soil used for watermelon seedling cultivation requires rich organic matter, loose, strong water and fertility conservation.

2. Soil preparation and fertilization

Re-application of base fertilizer is the basis to ensure the robust growth and high yield of watermelon stems. After the previous crop harvest, combined with deep ploughing and soil preparation, the rotten organic fertilizer 4000kg was applied per mu, the furrow spacing was 30cm, the bottom of the ditch was applied with 10cm thick organic fertilizer, the compound fertilizer 30kg or urea 10kg, diammonium phosphate and potassium sulfate each 15kg, then a layer of 10cm thick organic fertilizer, the top layer of compound fertilizer 20 kg or diammonium phosphate, potassium sulfate and urea each 10kg were applied, and the chemical fertilizer and organic fertilizer were mixed evenly with the soil in the ditch, leveling and ridging. Timely watering and covering plastic film and greenhouse film.

3. Topdressing after planting

Stretching manure

When watermelon enters the spreading stage, the demand for fertilizer and water increases gradually. at this time, topdressing should aim at promoting vine leaf growth and expanding leaf area, but to prevent overgrowth. Topdressing is mainly mature organic fertilizer, combined with appropriate amount of chemical fertilizer.

Expanded melon fertilizer

When the normal young fruit grows to the size of the egg, the fruit begins to expand rapidly, and the fertilizer requirement of the plant gradually reaches the peak of the whole growth period. At this time, we should re-apply expanded melon fertilizer to promote melon expansion and prevent premature senility. Topdressing is mainly based on phosphorus and potassium fertilizer, with little or no application of nitrogen fertilizer to avoid the decline of watermelon quality caused by excessive nitrogen fertilizer.

Compound fertilizer

After the harvest of the first stubble melon, the quick-acting chemical fertilizer was applied immediately. Generally, urea 1520k potassium sulfate 15kg and diammonium phosphate 10kg were applied per mu, combined with topdressing and watered once. By strengthening the management, replenishing the nutrients and water in the soil, maintaining the strong growth of the plant and preventing the premature senescence of vine leaves.

4. Skillfully applying foliar fertilizer

Foliar fertilizer spraying is a necessary means to make up for the deficiency of root absorption, supplement nutrition and balance nutrients to the plant. it has the characteristics of low application cost, uniform fertilization, fast fertilizer efficiency and high nutrient utilization efficiency.