At present, rice is in the stage of heading grain filling, and the number of seedlings per acre has been determined. The main objective of field management is to increase the seed setting rate and increase the grain weight. This period is a crucial period for achieving high yields. The management of water and fertilizer in the field and pest control cannot be relaxed for a moment.
1. Late water management: Do a good job of field water management, ensure smooth heading and flowering, maintain root vitality, and ensure smooth grouting. During the earing and heading stage, deep water is kept in the field, but it is not suitable to deep water for a long time. During the grain filling period, soil ventilation should be maintained under the conditions of field water supply in order to raise the roots and protect the leaves, prolong the vitality of the root system, and prevent premature aging of the leaves. The specific water management measures are: let the water layer dry naturally after heading, then water every 5-6 days, then let it dry naturally, make the field wet and dry, to keep the soil aerated and moist, maintain the old The vitality of the root promotes renewed new roots, maintains the vitality of the functional leaves, and increases grain weight. Avoid cutting off water prematurely during mature period, generally cut off water for about one week before harvest.
2. Prevention and control of pests and diseases: It focuses on the control of rice planthoppers, rice leaf roller, leaf borer, stem borer, rice sheath blight, rice blast, rice smut, and stripe leaf blight. Comprehensively adopt agricultural and ecological control technologies, trapping and killing technologies, biological control technologies, and application of selective, high-efficiency, and environment-friendly pesticides, implement standards for prevention and control, master the appropriate control period, dosage of pesticides, and application methods. Each pesticide species is not used quarterly. More than 2 times to avoid pest resistance. Promote the use of buprofezin (Pentazoyl), fenthrin, pymetrozine and other agents to control rice planthopper, imidacloprid against whitebacked planthopper, profenofos, chlorantraniliprole, etc. Amine, tricyclazole and other agents control rice blast, insecticidal double, insecticide and other agents to control aphids. The promotion and application of Bacillus thuringiensis (Bt) preparations for the control of S. indica and C. meleagris, and egg hatching during the spraying period can effectively control pests and protect natural enemies in paddy fields. Rice blast and rice smut common areas and susceptible varieties cultivation areas, selection of Bacillus subtilis preparations, kasugamycin to prevent rice blast, well wax bud preparations to prevent rice smut and sheath blight, Jinggangmycin to prevent sheath blight. In areas where rice virus is endemic, Ningnanmycin is used in combination with insecticides to prevent and reduce the risk of viral diseases such as striped blight and black-streaked dwarf disease.
(1) Rice blast: The panicle blast must be sprayed twice in advance to prevent the drug. One breaks at the end of the panicle, and the other at the flowering stage of the panicle, at intervals of about 10 days. Use 20% tricyclazole 20% wettable powder 100 grams or 60 to 70 milliliters of Fuji No.1 emulsifiable concentrate and add 50 to 60 kg of regular spray water. Note: Dosage must be used at the end of booting and full heading; The spraying should be applied before 8 am and after 4 pm. Long-acting medicaments are used at the end of the booting stage. After playing the drug at the full heading stage, if there is a lot of rain, it will be repeated after 5 days.
(2) Sheath blight: two times from jointing to full heading, with an interval of 7 to 10 days. The method is: 20% Jinggangmycin powder 25 grams per acre, plus 10 to 50 kg of water spray, must be sprayed to the stem lesions.
(3) Bacterial blight: In the field of string-irrigation plots and bacterial blight, use 20% Ye Ku Ning 75-100 g water 50 kg prevention. Pay attention to control the onset center.
(4) Oryza sativa disease: Use 5% Jinggangmycin 300-350 ml per acre (Jianzhi Rhus blight) or 40% Rhizoctonia 75 g or 15.5% Bao Sui Ning 80-100 g water spray. In the first 5-7 days before the rice break prevention and control of the first time, heading again to prevent and control once.
(5) Locust: In the heading stage of rice, the hatching period of egg hatching is controlled until the young larvae stage. Use 5% Ruijinte 60 liters per acre to evenly spray 60 kg of water. Keep 3-5 days of shallow water layer better when applied. It should generally be applied about 1 week after the peak of egg hatching.
(6) Cnaphalocrocis medinalis: control from the peak of egg hatching to the young larvae. Apply 48% Los Herbal Emulsion 80ml or 5% fipronil 60ml per acre to evenly spray 60kg of water.
(7) Rice planthoppers: Spray 60 g of water on 10 g of 10% imidacloprid wettable powder or 40 g of rice bran (25% buprofezin WP) per acre. The key period of prevention and control is the generation of young nymphs that are the main victims. Spray first and then middle.
3. Apply appropriate foliar fertilizer to increase the weight of one thousand grains: the root activity of the hybrid rice after heading decreased, and the functional leaves gradually turned yellow. It was easy to defertilize and cause premature yellowing and dead of the leaves. The ability of the rice plants to reduce photosynthesis was weakened. Supplementary application of granular fertilizer can prevent premature aging of functional leaves, increase seed setting rate, and increase grain weight. The method of application is mainly foliar spraying. Urea with 0.5 kg per mu water 50-100 kg, spray concentration of 1%. Potassium dihydrogen phosphate was sprayed with 150 grams of water and 75 kilograms of water per acre. The concentration of trace elements sprayed is generally 0.01-0.1%. Pay attention to spraying carefully to see that can not be excessive, the amount of water should be enough to avoid excessive concentration of burning seedlings.
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