At the moment when the hybrid rice is about to be sown, the farmers face difficulties in choosing a variety of hybrid rice varieties. Some farmers blindly choose large-spike varieties and feel that large-spike varieties are more likely to obtain high yields. In fact, the yield of hybrid rice mainly depends on the total number of effective grains per unit area and 1000-grain weight, and the total number of effective grains per unit area is determined by the unit. Area of ​​effective panicles and effective grains per panicle. Therefore, if the panicle type is too small, it is obviously impossible to super-high yield; if the panicle type is too large, the seed setting rate will tend to be low. So how do farmers choose their own hybrid rice varieties?
According to the selection of varieties, many farmers nowadays do not arrange corresponding varieties according to the local climate and ecological characteristics. They blindly believe in advertising and believe that new varieties must be better than old varieties. In fact, many mature “old varieties†are more suitable for local climate and ecology. Can obtain stable and high yield, can be planted continuously for 3-5 years. The new varieties need to be tested first, the planting area is smaller, the test planting is continued for 2-3 years, and after the planting experience of the plant is accumulated, the area can be gradually expanded.
The Shanshan town of Fanchang County is dominated by single-season rice, and a few are planted with double late hybrid rice. There are mainly three kinds of cornices: rapeseed meal, wheat bran, winter free field. For winter and field crops and rapeseed pods, hybrid rice varieties with a relatively long growth period of about 140 days can be arranged to fully utilize the local temperature and light resources. It is more appropriate to choose the larger panicle cultivars with strong tiller ability. In Makin Field, where the live-based planting model is used, wheat is generally harvested in early June, and live broadcasts are mainly concentrated in mid-June. Varieties should be selected not to exceed 130-132 days, since it is a hot season in July and August. Due to the high temperature and the shortening of the growth period, these temperature-sensitive varieties actually only last for about 120-125 days. The hybrid rice varieties with medium-to-large panicles suitable for planting in our country are selected, such as Liangyou 6 and Xinliangyou 6 and Kailiang. You No. 8, Guodao No. 1, Fengliangyou No. 4 and other varieties. For plants planted after June 20th, it is recommended to plant double-late hybrid rice or late-season rice, but it must be broadcasted before the end of June. After the early-season rice is harvested, the hybrid rice will not exceed 110 days of live growth.
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.
Pc Board Venlo Greenhouse,Venlo Greenhouse,Venlo Type Pc Sheet Greenhouse
JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.engreenhouse.com