Field Management of jointing and long panicle stage of planting Rice

Rice jointing begins around the peak tillering stage and does not stop elongation of internodes until a few days after heading, which is called jointing and panicle stage. The goal of field management at jointing and long panicle stage is to promote strong stem, large ear, prevent overgrowth and lodging on the basis of tillering and panicle increase.

The main technical measures of field management are:

1. Scientific irrigation

Rice needs the most water at jointing and long panicle stage, especially at meiosis stage, so it should be guaranteed to meet the water demand of rice. However, when rice enters the period of jointing and panicle growth, the general temperature is relatively high, the decomposition of organic matter is accelerated, the microbial activity is exuberant, and the oxygen consumption is the largest, resulting in the accumulation of toxic substances and root hypoxia, which is not conducive to root growth, so it is not suitable for deep water irrigation for a long time. For this reason, the irrigation method at the jointing and long panicle stage of rice should be the proper withdrawal of water from the field at the end of tillering or early jointing stage, so as to control the occurrence of too many ineffective tillers and be beneficial to the control of diseases and insect pests. The water layer should be maintained in the later stage to meet the water requirements of meiosis and pollen content filling period within 5-15 days before heading. In the rest period, intermittent moist irrigation should be adopted, that is, the irrigation method of "old water does not dry, new water does not enter" should be adopted to promote the steady growth of rice plants.

2. Scientific fertilization

Fertilization at jointing and panicle stage of rice can be divided into flower-promoting fertilizer and flower-protecting fertilizer. Flower-promoting fertilizer was applied about 30 days before heading and flower-protecting fertilizer was applied about 15 days before heading. The application of flower-promoting fertilizer and flower-protecting fertilizer depends on the seedling condition. If the early growth of rice is poor, the number of seedlings is insufficient, and the leaves turn yellow, 3-5 kg urea can be applied as flower-promoting fertilizer per mu to strive for more effective panicles and increase the number of filled grains per panicle, on the contrary, it is not suitable to apply flower-promoting fertilizer to avoid late ripening and lodging in the later stage. Flower protection fertilizer requires that as long as it belongs to a normal-looking field, it should be applied. Generally, 8-10 kg potassium sulfate and 2-3 kg urea are applied per mu to meet the nutrient needs of young panicle growth of rice. High-fertility fields, such as garlic fields, do not advocate the application of nitrogen fertilizer as flower-promoting and flower-protecting fertilizer, but need to apply 5-8 kg of potassium sulfate at jointing stage to ensure that the leaf color of rice can fade naturally at heading stage and prevent late lodging and late ripening.

3. Timely prevention and control of diseases, insects, weeds and rodents

1) pest control. The main diseases of rice at jointing and panicle stage are rice blast, bacterial blight, stripe blight, rice false smut, etc., and the corresponding control agents are thiazole, Shiduqing, Jing Gangmycin, etc.; the main pests are rice stem borer, rice planthopper, etc., and the corresponding control agents are Shachongshuang, loxobenzene EC, etc. The prevention and control of diseases and insect pests should be based on the forecast and careful inspection in the field at the same time. If the disease and insect situation are found, it should be "symptomatic medication" as soon as possible to avoid harm.

2) Prevention and control of grass damage

Weeds at jointing and panicle stage are mainly weeds such as barnyards. the method of artificial pulling should be adopted to completely eliminate the weeds.

3) rodent control

If the harm of voles is found in the field during jointing and panicle growth, the "poison bait" prepared by different types of rodenticide should be put in time to control the rodent damage to a minimum.