Early rice remediation

First, the characteristics of flooded early rice

Early rice has different tolerance to fleas at different growth stages, and there are also differences in symptoms after licking. The degree of loss is light and heavy. Seedlings and tillers often cause thin and thin seedlings after pods have been planted. The base leaves are yellowish-brown, and the eucalyptus leaves appear after water receding, but generally they can resume growth. Early rice during the jointing stage often affected the internode elongation, and the rice internodes were shorter than the normal after retreating. The plants exhibited dwarfing phenomenon, fine and weak bending, and rotten leaves and black roots increased. Early rice was affected during the booting stage, but the rate of empty crops increased and the maturity period was delayed. The weight of spikelets and branches deteriorated, resulting in the death of young ears and the emergence of white panicles. In the milking period, most of the leaves were withered, the grain became darker, part of the grains germinated, and the 1000-grain weight decreased, which had a greater impact on the yield. The impact of flooding is that the root system is seriously damaged. The number of black roots and yellow roots in flooded rice increased. It was observed that conventional japonica rice and japonica submerged for 4 days, hybrid rice submerged for 6 days, the ratio of black roots and yellow roots reached 100%; rice submerged for 10 to 14 days, only the proportion of black roots At 90%, some of the roots died. The second is the death of leaves, tillers, main stems, and tillers. The first rice plants affected by the death of rice plants are the leaves that are submerged in water. The affected heart and leaves will also die. Afterwards, the tillers, main stems and tiller sections will all die one after another, resulting in lack of seedlings and a serious decline in the total number of seedlings. The third is the increase in the number of high births. The surviving rice plants grow with the leaves, and some even grow on the elongation stem section. Fourth, the growth period is delayed and the heading period is elongated. The growth period of rice after flooding is postponed, and the more the number of flooded days, the more obvious the delay in the growth period, generally flooding the fields of 3 to 5 days and nights, delaying the full heading period and mature period by 1 to 2 days; flooding 7 days and nights, full heading period and The maturation period is postponed by 2 to 3 days, and severely up to 5 days. The fifth is the decline in output. Due to the insufficient number of tadpoles in the japonica rice field, the post-disaster birthing was higher in the birthing stage, the ear shape became smaller, the 1000-grain weight decreased, and the yield decreased. The loss was more than 80%.

Second, remedial measures

The main measures are: 1 rapidly rule out water. Immediately after the floods took place, they should organize a power grab to prevent the seedlings of the early rice from exposing the water as soon as possible and minimize the flooding time. In the drainage process, the bank field should be raised first, followed by the low-lying field in the rear. Rainy days can drain the field once. If there are few shrubs in the field, the seedlings grow robustly and there are more floating muds in the field, which can be combined with draining of the open field to prevent the seedlings from lodging. If the drainage meets the solar weather, when the temperature is high, the drainage speed should be slowed down, and Tanaka should properly retain the shallow water layer. If it is drained once, it can easily cause the death of young crops, resulting in greater losses.

2 Remove sediment in time. After the early rice is affected, the stems and leaves are often covered with mud, causing the leaves to fall or lodging. In order to restore the growth of the seedlings as soon as possible, we should organize the force to pick up the sediment accumulated in the field as soon as possible and remove the floating objects so as to reduce the degree of pressure on the seedlings. At the same time, we should use bamboo sticks to sweep back and forth to sweep away the silt on the stems and leaves. When the water emerges from the tip, rinse the seedlings with water. After the water receded, the plants were uprooted and the rotten leaves and yellow leaves were removed.

3Drainage and water control timely. After the stagnant water in the paddy fields recedes, the field water is still in a saturated state. Drainage should be carried out to drain the water in the field soil and drained from the soil in the ditch. As soon as possible, the water content in the field is reduced, so that the floating mud formed by the flooding gradually sinks to promote new Root growth. Adhering to the dry, wet and wet irrigation method not only ensures the needs of the rice plants, but also ensures the ventilation of the soil, and promotes the occurrence of a large number of root systems at the upper nodes and a strong vitality. If the heading stage encounters low temperatures, it should be filled with deep water, and the grouting should be solidified in the later stage. Care should be taken to avoid premature water cuts.

4 increase available fertilizer. During the submergence of early rice, the vegetative organs of rice plants were damaged to varying degrees, and the roots, leaves, and pods resumed growth after effluent. A large amount of mineral nutrients was required, and the loss of fertilizer in the original paddy fields was high. At this time, root dressing and foliage should be taken. The combination of topdressing and topdressing available fertilizers. The fertilizer should be applied quickly and the amount should be sufficient to promote the growth of the rice plant as soon as possible. After the drainage, each mus (1 acre = 667 square meters, the same below) Waseda was spread with 5, 6 kg of urea and potassium chloride. Can also be used with a concentration of 0.3% potassium dihydrogen phosphate solution 50 kg, foliar spray 1 or 2 times, to meet the rice plant nutrient requirements, improve the photosynthesis function of the leaf, and promote the seedlings to restore growth as soon as possible.

5 Strengthen pest control of flooded early rice. . After the early rice is flooded, due to the reduced disease resistance of the plants, and the easy formation of a microclimate environment with high temperature and high humidity in the field, it is conducive to the occurrence and spread of pests and diseases, and is most likely to cause the occurrence of bacterial diseases such as bacterial brown smut and bacterial blight. With the popular, therefore, we must adhere to the rational use of fertilizer, irrigation, and strive to separate the irrigation and drainage, to prevent stringar irrigation of rice in the field, so shallow irrigation. Control the application of nitrogen fertilizer, appropriate increase in phosphorus and potassium fertilizers to enhance plant disease resistance. For the old wards and flooded rice fields where bacterial blight and bacterial blight have occurred in the early stages, chemical control must be carried out in a timely manner. For the disease hillock, use 20% Ye Qingshuang wettable powder 100-150 grams per acre, watering 50 kilograms, or 97% strong chlorine WP wettable powder 100 grams per acre, watering 50 kilograms for spray control. Spraying is required to be uniform and comprehensive, and sufficient liquid is sprayed to control the spread of bacterial diseases. In addition, the leaves and tendons born after flooding of early rice fields are relatively green, and are vulnerable to damage by rice leaf roller, especially when the early rice is flooded, the leaf color is green, and the growth period is often postponed. The devastating damage of the second generation rice leaffolder caused a large number of white leaves, which has a great impact on the production of early rice. It is necessary to focus on the prevention and control of the second generation rice leaf roller. The available effective agents are avermectin and methyla Vermectin Benzoate, Tetrachlortetramide, Chlorantraniliprole, Indoxacarb and others. In addition, due to the delay in growth and development, the opportunities for invasion of rice planthoppers and Sassafras tsutsugamushi are increased. Therefore, it is necessary to timely control the pest situation. During the late growth stage of flooded early rice, if there are more rainy days, we should pay close attention to rice cancer, especially the occurrence and control of rice blast disease in the panicle. The available effective agents are: Bacillus subtilis, polyoxin, kasugamycin, etc. Biological pesticides, and chemical pesticides such as tricyclazole and propionazole.

Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone

Laser Distance Meter

Laser distance measure is a very convenient tool for various types of applications in industries, construction and house decoration. Laser distance meter is a very useful device which gives accurate measurement of distance, area and volume especially in large areas such as rooms, apartments, buildings, real estates, factories, warehouses, infrastructures, gardens, roads, and many other applications requiring accurate results for distance , area and volume measurement.

Trade your heavy tape measure for laser rangefinder, which let you simply take measurements with one hand. No matter your job, the laser rangefinder will help you measure much farther, with greater accuracy and in more situations, saving you money and time.

Specification:

Laser Distance Meter,Laser Distance Measure,Laser Rangefinder,Laser Distance Gauge

Chengdu JRT Meter Technology Co., Ltd , https://www.rangesensors.com