After the return of wheat, it will enter the critical period of wheat management. All regions should strengthen the management of wheat in the spring according to the situation of the seedlings. 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. Pc Board Venlo Greenhouse,Venlo Greenhouse,Venlo Type Pc Sheet Greenhouse JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.thgreenhouse.com
One, warming and warming protection for the small age of the seedlings, small groups of wheat, can be recycled in the spring soil before and after the 1-2 times.
Secondly, postponing the first spring time in spring, the warming of the wheat field after the irrigation of wheat fields will not only promote the growth of wheat, but will cause the growth of wheat to be retarded. Specific irrigation time, local conditions should be based on soil moisture, soil texture and seedlings comprehensive determination.
1. The sowing of the wheat field, which is late and the group is small, should be held on March 20-25, the first irrigation time. Water irrigation in this period is beneficial to the growth of wheat in the green period, and can promote the tillering into the panicle to form high yield. Group structure.
2. For lands that have been sown too shallow, if there is no precipitation in the near future, the irrigation time may be appropriately advanced to March 15-20.
3. For sandy lands with poor water retention capacity, the irrigation time may be appropriately advanced.
Pre-winter sowing of wheat fields with a postponement of more than 800,000 wheat per acre from the average winter wheat crop before the winter, and the first irrigation time may be postponed until March 25 to April 5.
Third, a reasonable topdressing of wheat should be the first spring irrigation with top dressing, can effectively promote the growth of wheat, increase the rate of tillering and succession, mu recovery urea about 17.5 kg, should not be over-dressing. Individual land foundation poor or basal fertilizer application is too small, plots of poor seedlings can be returned to the soil back to the green when combined with planing, open rill mu urea 10 kilograms, the first urea topdressing 10 kilograms of irrigation. .
Fourth, cover the feces to warm up and protect the conditions of the farmers, can seize the time in the wheat field after the application of the stack of manure, can fertilize the soil, play a role in warming and protecting the earth. When spreading, pay attention to fine and even, do not cover the wheat seedlings. When returning green, the smashed wheat seedlings should be cleared and ridged in time to prevent shading from affecting the growth of wheat.
V. Timely control of weeds Wheat fields that are not chemically weeded before winter. When the average temperature rises above 10°C after mid-March, herbicides should be sprayed in time to control weeds, and 10% tribenuron-methyl WP can be used. 10-15 grams. At the same time as spraying the herbicide, it can mix and spray 50% carbendazim 90g, or 12.5% ​​wolfberry fruit 20g, or 20% triadimefon EC 10ml.
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.