Types of rice sitting and control methods First, sit type 1, cold damage type. Occurred in cold flood fields, cold paddy fields, back shade fields. Due to long-term flooding and low soil temperature, this type of field is more prone to sitting on a continuous cloudy day with low temperature and low temperature. Symptoms include delaying greening after planting, not taking new roots, aging roots, and impeding vitality. 2, lack of prime type. Dead yellow muddy field, white peony field lack of potassium; nitrate, cold leaching field phosphorus deficiency; carbonate purple soil, large fertilizer field and long-term heavy application of phosphate fertilizer zinc deficiency. Due to the lack of hormones, the physiological metabolism of the seedlings is hindered. Symptoms: P-deficit rice fields, young seedlings with less roots, weak roots, dark brown roots, axillary clusters, dark brown leaves; potassium-deficient rice fields, weak root growth, short leaves, dark green, old leaves above The auburn spots, the leaves are easily broken, and the main veins are yellow; the zinc-deficient fields, the seedlings are curled and the leaves are not easy to pull out, and the chlorotic stripes appear at the seedling stage, the roots are short and the leaves are red. 3, poisonous type. They occur in deep foot-fields that are flooded for a long time, and have a poor soil permeability, such as rushing fields, muddy fields, and large fertile fields behind houses. This type of plot produces a large amount of toxic substances such as hydrogen sulfide, organic acids, divalent iron, and methane, poisoning the roots of rice bran, and hindering the absorption of phosphorus and potassium in the root system. Symptoms mainly manifested as black roots and yellow staggered roots. 4, lean type. Occurs in heavily sloping shabby fields and high-yielding fields, and new ripening fields with a low degree of ripening. Due to the serious lack of soil nitrogen, other nutrients are not much, resulting in the slow return of green seedlings after planting. The symptoms are yellowing of the leaves, poor root development, and lack of development of the stiff seedlings. Second, the prevention and control methods Because there are many reasons for sitting, often a field of multiple reasons for concurrency. Therefore, it should be based on field conditions, prevention, comprehensive prevention and treatment. At present, we must implement the following two measures. 1, foliar fertilizer, fast-feed nutrients. Mu potassium dihydrogen phosphate (PPO content above 80%) 0.5 kg, zinc fertilizer (Zinc content above 20%) 0.5 kg watered with 75 kg foliar spray. 2, drainage drying field, warming ventilation. For deep-rooted muddy fields, cold-sweeping fields, and large fertilizer fields, it is necessary to drain the field to increase soil temperature and enhance soil permeability. In other fields, shallow water irrigation should be implemented to avoid deep water irrigation.
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