Key points of high-yield cultivation techniques for early rice throwing
A large class of alcohols and organic compounds is a compound in which a hydrogen atom in an aliphatic hydrocarbon, an alicyclic hydrocarbon or an aromatic hydrocarbon side chain is substituted with a hydroxyl group. Generally referred to as an alcohol, the hydroxyl group is attached to a saturated, sp3 hybridized carbon atom. If the hydroxyl group is bonded to the benzene ring, it is a phenol; if the hydroxyl group is linked to the sp2 hybridized olefinic carbon, it is an enol. The properties of phenols and enols are quite different from those of general alcohols.
A phenol having the general formula of ArOH is a type of aromatic compound in which a hydrogen on an aromatic hydrocarbon ring is substituted with a hydroxyl group (-OH). The simplest phenol is phenol. The phenolic compound refers to a compound formed by substituting a hydrogen atom on a benzene ring in an aromatic hydrocarbon with a hydroxyl group, and can be classified into a monohydric phenol and a polyhydric phenol according to the number of hydroxyl groups contained in the molecule.
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1. Age-appropriate throwing, uniform seedlings. On the basis of bred and strong sputum, it is necessary to throw the cockroaches at the appropriate age. s According to the production practice in recent years, the plastic tray is used for breeding. The optimum leaf age for throwing is 4 leaves and 1 heart, and the age is about 25 years old. When throwing cockroaches, Tian Yaoping, grass should be clean, and the soil should be kept moist. First throw 2/3 seedlings, then use l/3 seedlings to make up the thin, and strive to reach the hole in the range of 33cm square. The empty space should be done in time to make the missing work, so that the basic seedlings per 667m2 field reach 120,000. 150000.
2. Prevent weeds. Because the plants are unevenly distributed, the weeds are prone to weeds in the cavity, and it is inconvenient to manually weed. Therefore, after about 10 throwing, weeding herbicide weeding, 50% killing wettable powder per 667m2 25g Or 10% benzathlon wettable powder 15g spray 40-50kg of water, can effectively prevent weeds.
3. Fertilized by seedlings. Science is water. After the planting of the early rice, the rooting is fast and the branching is early. The fertilization technique should be adopted before and after supplementation. On the basis of applying organic Fertilizer, 25kg of ammonium bicarbonate and calcium superphosphate per 667m2 were used as kneading fertilizer. After transplanting 10 large fertilizers, combined with herbicide application, 7.5-10 kg per 667 m2 of urinary tract, after seeing the seedlings to apply the flower fertilizer, and with 5 - 7.5 kg of potassium chloride to enhance the lodging resistance of rice plants. In the management of water slurry, the surface of the field is kept moist for 3 to 5 days after the transplanting. In case of heavy rain, a shallow water layer of 3 cm depth is poured to prevent floating seedlings from pile up. After shallow water irrigation, promote living trees. When the number of seedlings per 667m2 reaches 280,000 to 300,000, the seedlings should be twisted in the field. Intermittent irrigation is adopted in the middle and late stages to keep the soil moist, so as to prevent lodging in the later period.
In addition, we must do a good job in the prevention and control of pests and diseases, especially the prevention and control of sheath blight.