When the chestnut fruit turns brown, the fertilizer is applied before harvesting, and the quick-acting fertilizer is the main. As a result, more than 50 kg of trees, 1.5 to 2 kg of urea per plant, 0.5 to 1 kg of potassium chloride, sprinkled after rain, or 80-100 kg of decomposed manure and manure. After 5 to 10 days after fruit picking, the fertilizer is applied, mainly NPK compound fertilizer and high quality organic fertilizer. Each plant applies 2 to 3 kg of NPK fertilizer and 25~30 of manure and poultry manure. kg. Around the canopy drip line, digging deep and wide 25 to 30 cm ring groove for fertilization.
If the weather is dry, apply water to each tree after fertilization or simmer 80-100 kilograms of decomposed human and animal manure to promote fertilizer dissolution and conversion, which can improve fertilization effect. In addition, before and after fruit picking, foliar spray fertilizer should be applied, spraying 2~3 times 0.3% urea + 0.5% potassium dihydrogen phosphate + 0.2% borax mixture, and other nutrient solution can also be used. It is best to choose a cloudy or breezy cloudy day when fertilizing, and it is better to spray it before 9:00 am or after 4:00 pm. In the event of heavy rain within 10 hours after spraying, it is necessary to re-spray and spray once every 7 to 10 days. The nutrients are supplemented from the foliage, which is beneficial to the fruit trees and the resulting mother branches for flower bud differentiation.
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Venlo structure is a popular one at present. This architecture uses horizontal girder as main bearer, forming a stable structure with columns. There is consolidation between horizontal girder and column, and hinge is used to connect column and foundation.
In Venlo greenhouse, foundation is made of reinforced concrete and the side wall is made of brick or reinforced concrete plate. The steel frame always use hot dip galvanized light steel. Roof beam adopts horizontal girder structure and using herringbone connection. The horizontal girder bears 2 or more roofs, which is made of aluminum alloy. This material is used as roof structure material and also glass inlay material. Other beams using gutter style to minimize the section. Delighting material of the roof and side wall using the hollow double-layer or multilayer PC board.
PC board is mainly made of PC/PET/PMMA/PP materials, it need sun screen coating to resist ultraviolet resist and ageing, and it is also required to be anti condensation and antidrug.
As a kind of light material, use PC board can greatly reduce the weight of greenhouse structure, and corresponding reduced the size of the steel frame, which saving the cost of steel.
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