Key points of Management in Grain filling stage of planting Rice

The grain filling stage is the key period to determine the yield of rice. Field management should aim to maintain roots and protect leaves, prevent premature senescence, improve photosynthetic efficiency, promote grain filling, and increase seed setting rate and grain weight.

First, apply grain fertilizer to look at the seedlings, the fields and the sky. Those with yellow leaves and short flag leaves should be replenished, those with thick green leaves and hypertrophic flag leaves should not be applied, and those with thin fields, fertilized fields, sunny days and rainy days should not be applied. Generally speaking, it is appropriate to apply 2kg of urea per mu during the break period.

Second, rational irrigation during the filling period can raise roots and protect leaves, reduce empty grains and blighted grains. A certain water layer should be maintained in the field during heading and flowering. The filling period is mainly wet, dry-dry-wet interval irrigation, that is, it naturally dries for 1-2 days and then irrigates to maintain root activity. Sandy loam with good permeability is often aged prematurely due to lack of water, so it is not suitable to use this method, but should maintain a thin water layer. In case of high temperature in flowering stage or low temperature in fruiting stage, the temperature should be adjusted by filling deep water as soon as possible to reduce empty and blighted grains. Water should not be cut off prematurely before harvest, for early rice is cut off 4-5 days before harvest, and middle and late rice is cut off 6-7 days before harvest.

Third, do a good job of "four defenses"

1. Prevent and control diseases and insect pests. The main diseases and pests in this period are rice blast, bacterial blight, rice false smut, sheath blight, rice leaf roller, rice planthopper and so on. The fields with more total tillers and vigorous growth should be taken as the key control points, and the key period of rice break should be grasped for control.

2. Prevent lodging. Rice lodging mainly occurs in the fruiting stage. In addition to strengthening fertilizer and water management and preventing diseases and insect pests, 3% superphosphate leaching solution can be sprayed on Wangchang fields many times, and 40% corn fermented 40 ml plus 40 kg water can be sprayed at the full ear to restrain the elongation of internodes under the panicle and enhance lodging resistance.

3. Prevent greed and greed. Spraying 500 mg / kg ethephon to the fields with tender growth, hypertrophic leaves and draped sword leaves at the milk stage to promote ripening.

4. Prevent premature senility. In addition to increasing the application of grain fertilizer and strengthening the management of water slurry, 2% urea and 0.3% potassium dihydrogen phosphate can also be sprayed on the leaf surface, and the mixture of trimethoprim and green leaf pioneer can be sprayed in the later stage, which can obviously protect the leaves from aging.