At the end of November, the nectarine forced defoliation to start the plastic film shed, cover the shade of grass during the day, and uncover the ventilation of the mulch in the evening, and maintain the low temperature of 0°C to 7°C. On December 22, the curtains began to heat up and warm up while making vent holes. The curtains are uncovered at approximately 8:00 a.m., and are screened at 3-4 p.m. Later, with early sunrise and sunset time, early release, delay, try to extend the lighting time. No less than 5°C at night before flowering, no higher than 24°C during daytime, no less than 8°C during flowering, no higher than 26°C during daytime, no less than 10°C during fruit growth to maturity, and no more than 28 during daytime °C.
From the shed until flowering, the humidity in the shed was maintained at 70% to 80%, the flowering period was maintained at 50% to 60%, and the fruit was grown to maturity at 60% or less. If the temperature is too high or the humidity is too high, use a vent to adjust the ventilation.
Second, flower and fruit management
Natural nectarines have a high rate of fruit set, but they are not conducive to pollination and insemination because of poor air circulation and high humidity in the greenhouse. Therefore, artificial pollination or bees should be conducted to increase fruit setting rate. Generally, 1 to 2 boxes of bees assisted pollination are placed in each shed 2 to 3 days before the initial flowering. 3 weeks after flowering, fruit thinning, fruiting, deformed fruit, small fruit, and densely squeezed fruit were carried out, and the fruit spacing was maintained at 10 cm or more. Generally, 3 to 5 fruit are left in the long fruiting branch, 2 to 3 fruit in the middle fruiting branch, and 1 fruit in the short fruiting branch. After the fruit is fixed, the residual flowers on the young fruit must be removed in time, otherwise black spots or rotten fruit will be caused on the fruit surface, which will seriously affect the fruit quality.
Third, the tree management
Immediately after flowering, sprouts are removed and pruned after flowering. Cut off part of the fruitless branches and retract the fruitless long branches. When the new shoot grows to 15-20 centimeters, it sprays 150 times 200 times paclobutrazol solution, and then sprays it once as the case may. It can basically control the growth of new shoots and increase the fruit setting rate. Other pruning measures with open field Taoyuan.
Fourth, fertilizer and water management
Immediately after the curtain was warmed up, it was filled with water and covered with plastic film. On the 10th day after flowering, a small amount of water was punched in a hole in the membrane, and water was irrigated once after the hard core and before the fruit was colored.
Before catching the small water, the first chemical fertilizer was chased after flowering to supplement the consumption of nutrients during flowering. The fertilizer is Isaac, which can be enriched. Each plant can be enriched with 100 grams, 25 grams of urea and 25 grams of potassium sulfate. In the second half of March, the second fertilizer was removed from the mulching film to supply the development of embryos and the need for hard core and shoot growth.
Combining pest control with foliar spraying for 4 times, spraying 0.3% to 0.5% potassium dihydrogen phosphate and 0.3% to 0.4% urea solution twice.
V. Pest Control
Due to the relatively high humidity in the shed, poor light, and poor ventilation, the prevention and treatment of diseases should be emphasized. After the shed is used to prevent and treat pests and diseases, the concentration of pesticides must pay special attention, and it is generally advisable that the concentration of pesticides is not high enough. After exposing to temperature rise, spray 3~5 Baume degree lime sulfur once, warming for about 20 days (flower bud expansion period), spraying dimethoate 800 times solution and thiophanate-methyl 800 times, spraying carbendazim once after spraying 800 times. The liquid accelerated killing D 2500 times. Spray 800 times of carbendazim once every 20 days or so.
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