Strictly "four customs" to win over rice sheath blight
In recent years, sheath blight has risen as the main disease of rice, and has four major characteristics. First, there is a wide occurrence, almost every field has occurred; Second, there are few varieties of anti-Sheath blight, and the varieties that are currently planted and propagated have varying degrees of occurrence. Third, the degree of harm is increasing, resulting in a great deal of damage, even lodging The fourth is that the lower part of the rice plant is hidden and it is easy to overlook and miss the opportunity for prevention and control. Therefore, prevention and control of rice sheath blight is the key to seizing high food production. Strict management of the four barriers in the control strategy is the key to defeating the enemy. First, salvage bacteria nuclear. Rhizoctonia mainly relies on sclerotia for wintering in paddy fields. When winter sclerotia passes through winter and spring to early rice transplanting, 60-70% of sclerotia can germinate. The number of sclerotia that fall in the field has a certain relationship with the incidence. In the last year or the last season, the sclerotia that landed in the field was heavier than water and could float with water after a long period of time. After paddy fields were flooded The elimination of sclerotia floating on the surface of the water can reduce the initial germination of the bacteria and effectively reduce the incidence of early rice growth. The method of removing the fish is to properly deepen the water layer after the field has been flattened, and then use rakes and other tools to remove the slag and sclerotia floating on the surface of the water, pick it away from the rice fields, and bury or burn it. Second, fertilizer and water management. Strengthen the management of fertilizer and water and improve the disease resistance of seedlings. Late and heavy application of nitrogen fertilizer, long-term irrigation of deep water can easily cause the soft and green leaves and leaves of the seedlings, serious closure of canopy and reduce disease resistance, aggravate the occurrence of sheath blight. Therefore, in the fertilization strategy to grasp the following three principles: First, pay attention to basal fertilizer, apply more farmyard fertilizer and organic fertilizer, the general amount of basic fertilizer should account for 60% of the total amount of fertilizer. The second is the reasonable combination of nitrogen, phosphorus and potassium, especially the amount of nitrogen fertilizer can not be excessive. The third is to top-dress fertilizer early, to the right amount, according to the "pre-heavy, in control, after fill" method. Nitrogen fertilizer can not be applied too late, so as not to cause the seedlings greed and cause sheath blight. In the management of water, shallow, exposed, resting and living irrigation methods are adopted to solve the contradiction between water and gas in the soil. In the stage of rice tillering, shallow ground irrigation should be carried out to properly expose the fields so as to facilitate detoxification, increase gas, and promote root growth. The appropriate late-stage cropping at the end of tillering, control of invalid tillering, and suppression of stem and leaf leggy; after entering booting stage, live water irrigation should be implemented. To the grouting period, we must adhere to dry and wet, promote the growth of the seedlings, disease-free to the old. Third, toxic soil prevention. The prevention of the growth and germination of mycelial growth of mycelia caused by inoculation of rice plant peduncles can inhibit mycelial growth and germination of streptozotocin, and its efficacy is stable, and its residual period is long. After application, it can be absorbed by rice roots, and it can also infiltrate leaves, which has protection and prevention. It is required to be applied within 15-20 days after the rice is planted. Spare 20% of rice feet, 250 grams of fine soil and 25 kilograms of soil shall be sprayed evenly into the paddy field, which has a significant preventive effect. According to a comparative survey, the sickness rate of rice seedlings planted with poisonous soil on rice plants was about 10%, and the soil was not spread on toxic soils. The sickness rate was above 50%. However, the use of rice feet green, must be in the booting period before the prohibition of use in the booting phase or the late growth period, because the rice has a killing male foot function, used in the booting stage, light emerged empty ears and valleys, heavy can not heading. Especially at high temperatures of nitrogen deficiency and potassium deficiency, the impact on rice yield is even greater. Fourth, pharmaceutical control. The occurrence of rice sheath blight is generally slower in the early stage and faster in the later stage. Therefore, field investigations should be strengthened during the early rice delivery season. When high temperature and high humidity weather is encountered, field disease control rates should be controlled immediately when the disease incidence rate is about 30%. The agent may use 1 kg of Jinggangmycin powder or 0.2 kg of Jinggangmycin water and 50 kg of water, and spray 2-3 times according to the degree of disease and weather conditions. The growth period of late rice is short, and the time of occurrence of sheath blight is usually about half a month from the beginning to the outbreak. Therefore, two nights should be used twice, generally in the jointing and booting period, once every 7 days. Given that sheath blight both extend upward from the lower part of the diseased plant, spraying should be focused on the middle and lower parts of the rice plant in order to receive good results.
Paraquat
It is an organic compound with the [(C6H7N)2]Cl2. It is classified as a viologen, a family of redox-active heterocycles of similar structure. Paraquat was manufactured by Chevron. This salt is one of the most widely used herbicides. It is quick-acting and non-selective, killing green plant tissue on contact. It is also toxic to human beings and animals due to its redox activity, which produces superoxide anions. It has been linked to the development of Parkinson's disease. The name is derived from the para positions of the quaternary nitrogens. Paraquat may be in the form of salt with chloride or other anions; quantities of the substance are sometimes expressed by cation mass alone (paraquat cation, paraquat ion).
Agricultural Paraquat,Agricultural Pesticide Products,Agricultural Spray Herbicide Additive,Paraquat Synergist Agent
Ningxia Bornstein Import & Export Co., Ltd , http://www.bornstein-agriculture.com