Mid-and late-stage management of thrown rice

1. Sufficient seedling period: The so-called seedling is the seedling number of 80% of the planned number of panicles. Under normal weather conditions, throwing stubble at constant tillage takes about 16-18 days after throwing, and it takes about 18-20 days after no-tillage throwing to reach enough seedlings. Fertilization was determined according to the weather, soil fertility and growth of seedlings.

(1) If sufficient seedlings are available on time, but the seedlings grow weaker, the leaf color and the amount of growth are obviously insufficient, or the time has not yet reached the seedling number, fertilization must be done in time. Mushi pure nitrogen is about 1.75 kilograms, and potassium chloride is applied in a ratio of 1:2-3 to potassium chloride.

(2) The seedlings grow well, but due to low land fertility, or insufficient early fertilization, resulting in insufficient leaf color levels, there are signs of premature turning into red, and it must be timely fertilization. Mushi pure nitrogen is about 1.25 kilograms, and potassium chloride is applied at a ratio of 1:3.

(3) The seedlings grow well, and the leaves have dark green color and cannot be applied with nitrogen. Only phosphorus and potash fertilizers can be applied, that is, a small amount of superphosphate mixed with 7.5 kg of potassium chloride can be used.

2. panicle initiation two: This period can be calculated in accordance with leafy bracts see hair or throw after a few (about 40 days after throwing) day, as the leaves turn red and promote the degree of application of fertilizers.

(1) The red color of leaves is good and the degree is enough. Mushi pure nitrogen can be about 2 kg, the ratio of nitrogen to potassium is 1:2, and the compound fertilizer is combined with potassium chloride.

(2) If the degree of redness of leaf color is normal, the amount of nitrogen applied may be appropriately reduced, but the amount of potassium should be ensured, such as 1.25 kg of pure nitrogen in Mushi, and the ratio of nitrogen to potassium is 1:3.

(3) If the leaf color does not turn red, no nitrogen can be applied. Only P and K fertilizers can be applied, that is, a small amount of superphosphate and potassium chloride 5 to 7.5 kg mixed wet fine mud.

3. Young panicle differentiation from 4th to 5th: The main seedlings enter the 10-12 days after the second stage of young panicle differentiation. At this time, the panicle length is 0.5-1 cm, and the leaf color level is insufficient. There are signs of premature turning into red and should be appropriate. Shi Bao Hua Fei, generally Mushi compound fertilizer can be imported 7.5-10 kilograms, attention can not be single urea. If the leaf color is normal, this fertilizer may not be applied.

Second, the water management: Immediately enough seedlings when exposed to open field, more exposure to light the sun, 1 week before young panicle differentiation to fight light field, increase soil oxygen, increase photosynthetic product condensation and effective delivery long thick, inhibit the invalid childbirth, and can Facilitate the change of leaf color by time. After spike differentiation, in addition to the need to fertilize the water layer for a few days during fertilization, irrigation is generally performed to maintain the moist state of the soil.

Third, the pest control: throwing rice in the middle of the large population density, ventilation and ventilation is somewhat poor, and often encounter "dragon boat water", humidity, and do a good job of this period of pest control is very important. The major pests in the middle stage of throwing rice are sheath blight, rice blast, bacterial leaf streak, rice leaf roller, and rice planthopper. Commonly used drugs include worms, killers, and insecticides. At the time of sufficient seedling stage and young panicle differentiation stage, 50 grams of Mu Wenlingling is applied to 75 kg of water, and 50 grams of wormwood spirit plus 150-200 ml of insecticidal cream or 100 ml of water to kill 100 ml of water can also be used. Prevention.

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