In the early spring season (2~4 months), the temperature in the shed experienced a process of increasing temperature from low temperature to late stage. The plant nutrient accumulation decreased, the growth and development accelerated, the flowers fell frequently, the disease occurred more, and the pests and diseases occurred. The period when sheds are difficult to manage. According to the law of temperature change, it can be divided into two stages for shed management.
First, the first phase is from February to March
The general temperature is lower and the soil surface is drier. At this time, it should be based on heat preservation and antifreeze. The shed temperature should be maintained at 25 °C ~ 28 °C during the day and 15 °C at night.
1. Temperature management is ventilated during the day, and the shed will be opened after 9:00 on sunny days. The ventilation will be closed from small to large at 4 pm. Strengthen the cover insulation work at night to prevent the temperature inside the shed below 10 °C. The management of rainy days is slightly different to ensure the temperature in the shed is mainly. Small ventilation can be carried out around noon, not too large, and the time cannot be long to avoid the temperature drop in the shed is too large.
2, fertilizer and water management fertilization with foliar spray and root leaching mainly, should be carried out at noon on sunny days, this is the best time for plants to absorb nutrients.
3, Baohua Baoguo due to weak light, lack of nutrition, soil dry or too wet, too high temperature, too much nitrogen fertilizer application, plant length, etc., can cause falling flowers and fruit. Generally use 2.4-D20 ~ 30 mg / kg + gibberellin 10 ~ 20 mg / kg + 0.1% of 50% Sucrose (or carbendazim) WP powder, the flower of the initial flowering and flowering period Apply a little bit of liquid and apply a flower once, which will increase the fruit setting rate and promote fruit growth.
The anti-falling effect on the young leaves and shoots is lighter. Commonly used spray method, the concentration used in the early low temperature stage is 30 ~ 50 mg / kg, with the temperature rise, the use concentration decreases. Use a hand-held small sprayer to place a flower spike between the fingers on the palm of your hand and spray once. If there are more spikes, the flowers that are open later can be sprayed again.
Second, the second stage is April
The temperature gradually rises, the humidity changes, and the dry and wet alternates. Generally, the humidity in the shed is too large, so that the ventilation work should be done in time, the humidity in the shed and the temperature in the shed are too high, and the occurrence of diseases is reduced.
1. Temperature and ventilation management The noon temperature in the shed is gradually higher than the normal temperature of the plant. Ventilation should be strengthened. Otherwise, the temperature in the shed will be too high and the plant will be burned. The length of ventilation and the amount of ventilation can be controlled according to the temperature displayed by the thermometer in the shed.
2. Timely application of whole fertilizer and pruning With the gradual increase of temperature, the plant growth is gradually accelerating, and the supplement of nutrient fertilizer is urgently needed, from small to large, and the amount of fertilizer is increased. Generally, 5 to 7 kilograms of urea per acre is applied once every 10 days; it should also be sprayed with 0.3% to 4.4% potassium dihydrogen phosphate or green Fenway 1 or 3 solution 3 to 4 times. At the same time, combined with top dressing, timely watering, keeping the soil moist, ventilation after ventilation, to prevent the air humidity in the shed is too high. According to the growth of the plants, the plants are adjusted in time to ensure the best result plant type.
3, strengthen pest control Because the humidity inside the shed is large, the disease is common, dust or fumigant should be used to reduce the water dispersion in the shed. Underground pests can be rooted with 48% lysine lotion 1000 times solution, aphids, hummers, etc. can be used to kill and kill smoke agents. The disease is gray mold, and it is prevented by 2-3 times with 50% gram of WP 1500 times or 50% of chlorhexidine 2000 times solution every 7 to 10 days. The main pests are aphids, red spiders, thrips, etc., which are controlled with 10% good winter 1000 times liquid or 20% keke star emulsifiable oil 1000 times liquid; red spiders are controlled with 73% gram emulsifiable concentrate 2000 times liquid.
4. Timely harvesting and topdressing and harvesting should master the principle of “early time and slightly tender fruitâ€. It depends on the width and width of the white ring-shaped belt at the junction of the bract and the fruit. It is better to use a wider white ring. Also known as the eggplant eye). Not only can the morning market, the quality is tender, increase the early yield, is conducive to the growth of the young fruit in the later period, and improve the full-term production.
The management of rainy days is in the management of water, pay attention to ventilation. Firstly, the drainage ditch around the shed should be controlled to avoid causing too much humidity in the shed. The shed is made of high sorghum to avoid spraying and pouring water in rainy days. At noon, the outside temperature allows the "two low, two small, two high and two long" ventilation: low temperature, small ventilation; low humidity, small ventilation; high temperature, long ventilation; high humidity, long ventilation. If the temperature in the shed is low and the humidity is high, short-term ventilation should be carried out, but it is necessary to keep the shed in time.
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