After the greenhouse nectarine shed is a critical period for its management, the following points must be paid attention to in management:
Decrease the temperature rise time The greenhouse nectarines are covered with plastic film in mid-November, and at the same time covered with straw curtains. Cover during the day, pull up at night, and open the air vents to artificially lower the temperature to lower the temperature to below 7.2°C early, prompting early dormancy. After 40 days, 800 hours of cold demand can be met, and the temperature will start to rise on December 10, and the grass curtain will be opened during the day and covered at night.
Temperature and humidity control
In the daytime, the temperature is warmed up by opening the straw curtain at around 8 am, and covering the straw curtain at around 4 pm for heat preservation. From the beginning to the germination, the highest temperature during the day is 14℃～16℃, and the night is above -2℃; the temperature is controlled at 18℃～22℃, the lowest temperature is not lower than 5℃; the highest temperature during the flowering period The temperature should not be higher than 25℃, and the lowest temperature should not be lower than 7℃; the temperature during the fruit development period should be controlled at 25℃, the highest temperature should not exceed 28℃, and the lowest temperature should not be lower than 10℃. Generally, when it exceeds 25℃ in the daytime, open the air vent to cool down .
Humidity is maintained at 70% to 80% during the shed to the budding period, 50% during the flowering period, and around 60% after flowering until the harvest period.
The suitable tree shape for nectarine cultivation in the plastic pruning greenhouse is the spindle shape. Generally, the trunk is 30 cm high and the tree height is controlled between 1.5 to 1.8 meters. Each plant retains 6 to 8 main branches. The lower main branch has an opening angle of 90° and is long. 80-90 cm, the upper main branch has an opening angle of 60-70° and a length of 40-50 cm, forming a tree shape with a small bottom and a large tree to facilitate ventilation and light transmission. When cutting in winter, thin out the branches below 30 cm above the ground and some over-dense branches; lightly short cut the lengthy branches above 50 cm, and throw away the remaining branches.
Soil, fertilizer, and water management Immediately water the shed and apply 1000 kg of decomposed chicken manure per mu, and 50 kg of NPK compound fertilizer. After hard core, spray 0.3% potassium dihydrogen phosphate solution twice, water once when the fruit is the size of a thumb, and no more water afterwards. The fruit should not be watered in the near-ripening period to prevent fruit cracking.
Flower and fruit management artificial pollination, artificial pollination twice in the full bloom period, point pollination on flowers between different varieties. In order to improve the quality of the fruit and promote the development of the fruit, fruit thinning should be carried out for trees with high fruit setting rate. Generally, fruit thinning begins 2 weeks after flowering, with 2 to 3 long fruit branches, 1 to 2 medium fruit branches, and short fruit branches. One is appropriate, and the outer extension branches do not retain fruit. Attention should be paid to the location and development of the remaining fruits, and no small fruits, deformed fruits, parallel fruits, and diseased fruits are left. In addition, the remaining calyx that has not fallen off should be removed in time after the flowers have died, to avoid contamination of the fruit surface and fruit diseases.
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