The Latest Field Management Measures in Late Rice Stage

Protecting stems and leaves, preventing premature senescence, enhancing photosynthetic efficiency after heading, promoting high accumulation and high transportation of nutrients are one of the key measures to achieve high yield and good quality of hybrid rice.

supplementary grain fertilizer

After heading, the functional leaves of hybrid rice gradually turn yellow. If the fertilizer is removed, the leaves will turn yellow prematurely and die, and the photosynthetic ability of rice plants will be weakened. Therefore, it is one of the effective measures to increase the number and fullness of grains by supplementing fertilizer, prolonging the life span of leaves and improving the photosynthetic ability of leaves. The application of grain fertilizer is generally based on spraying foliar fertilizer outside the root. Spraying 2~3 times from the break stage to the filling stage, each time using 100 g potassium dihydrogen phosphate and 0.5~1 kg urea per mu, dissolved in 50 kg water and then mixed with 15~20 ml 802 to spray on the stems and leaves of rice plants. For the fields with insufficient base fertilizer and early denitrification and yellowing of leaves, it is advisable to apply urea 2.5~4 kg per mu before heading, which can promote flower bud differentiation and prevent spikelet degeneration. Give full play to the big panicle advantage of hybrid rice.

regulating water

The requirement of water for hybrid rice at heading and flowering stage is more strict, and it is most vulnerable to high temperature damage at heading and flowering stage. It is appropriate to carry out deep irrigation, increase field humidity, reduce temperature, and promote heading tidiness and normal flowering pollination. If you encounter abnormal high temperature weather, you should spray clean water to improve the ear layer microclimate and mitigate the impact. After heading, plant root senescence, should ensure water supply conditions to increase the opportunity for soil aeration, air to nourish roots, root maintenance leaves, to prevent root decay and leaf failure. A certain water layer should be maintained in the field from heading to early pollination to meet the physiological water requirements of plants. After that, moist irrigation should be maintained according to the principle of alternating wet and dry. Wet is mainly used in filling stage, dry is mainly used in wax ripening stage, and dry, wet and wet alternate to maturity. Cut can not cut off water too early, otherwise it will artificially lead to premature aging, resulting in reduced yield and reduced rice quality, generally about 5 days before harvest water is appropriate.

pest control

The diseases and insect pests of hybrid rice in late stage are seriously damaged, which are important factors affecting "reservoir protection","strong source" and "smooth flow", and obstacles to high yield and high quality. Leaf-destroying diseases and insect pests of hybrid rice mainly include late syndrome, rice blast, bacterial blight and rice leaf roller, culm-damaging diseases and insect pests mainly include sheath blight, rice planthopper and stem borer. We should focus on the prevention and control of late syndrome, because it is the result of mixed growth of various fungal diseases, which often causes scorched leaves, damaged leaf tips and serious premature aging, which can reduce rice by about 20%. At the breaking stage, 50~ 75g of 40% Hekuling or Yelubao WP per mu, diluted with 50kg of water and sprayed evenly on the stems and leaves of rice plants, can obtain remarkable effects of preventing diseases and leaves and preventing premature senescence. For rice blast frequent areas and bacterial blight epidemic areas, in order to prevent the disease, tricyclazole, Ye Kuning and other corresponding chemicals can be added in the break period.

boron fertilizer spraying

At flowering and fruiting stage of hybrid rice, sufficient boron fertilizer supply can improve seed setting rate and increase 1000-grain weight. According to experiments, spraying boron fertilizer solution at the later stage of hybrid rice can increase the seed setting rate by 4.3%, and increase the 1000-grain weight by 0.5~1 g. Therefore, in the boron-deficient field or rice field after rape stubble, it should be sprayed once at the initial heading stage and the full heading stage respectively, which can be combined with spraying grain fertilizer mixture, 100g borax or 100g photosynthetic micro-fertilizer per mu each time, diluted with 50kg water and sprayed evenly. When preparing borax solution, first use a small amount of warm water to fully dissolve borax, and spray it in time after preparation.