Rice damage occurred quickly to remedy
In recent days, heavy rains continued to occur in the southern part of Hunan Province, resulting in floods and heavy rains in some areas. This has had a serious impact on rice production. Remedial measures should be taken as soon as possible to restore production. At present, the province's early rice is in the booting stage to the heading stage, and the first season rice is in the tillering stage to the ear growth stage. The post-disaster remediation should be based on the growth period of rice and the degree of harm caused by floods. Aphid damage affects growth Damage is the damage to the plants caused by the soaking of rice when the water level rises in the planting area. When the rice plant is completely submerged in water, photosynthesis is completely stopped, various life activities are at a standstill, and as the flooding time is extended, rotting becomes dark. Rice has different stages of growth and development, and its flooding time and harm degree are different. Flooding for 2 to 3 days during the tillering period can still gradually resume growth after the water is discharged. Flooding takes 4 to 5 days. The aboveground part is completely dry, but the tiller buds and stem growth points have not yet died. Therefore, new leaves and tillers can still occur after the water is discharged. The longer the flooding time, the slower the growth. The rice plant showed necrosis on the leaf blade, which was yellow-brown or dark green, and the heart was slightly curved. After the water receded, there were different degrees of leaf dryness. When the panicles are submerged at 2 to 3 days, the spikelet differentiation is inhibited, and the panicles cannot head. With the increase of the number of flooding days and the depth of flooding, the internode elongation is greater, but after the water recedes, the elongation of the plants is shortened, and even the neck and neck sections are shortened. Under severe conditions, the stalks are weakened. , There are deformed phenomena such as bending, breaking and lodging of the plant, re-winging and bending. Flooding at the booting stage inhibited the development of young panicles, resulting in the formation of terrible spikes and degenerate spikelets. In flooding for more than 2 days, most of them could not heading, and later formed high-pointing tillers, some of which could be eared, but were not strong, and emerged as rotting spikes, abnormal spikes, etc., and undead young spikelets and twigs severely degraded after heading. White panicles, even only the cob, heading and maturity delayed by 5 to 7 days, the number of grains per panicle decreased. Heading and flowering period is flooded for 2 to 3 days. After water emerges, rice spikelets can still bloom, and some of them can be solid and flooded for more than 3 days. Because of pollen and anther damage, they can flower but cannot pollinate, and soon the ears are dry. Differentiate the remedy After the damage, the rice suffers varying degrees of damage, and the extent of the damage should be diagnosed to determine whether to leave or replant. First of all, the degree of victimization should be judged according to the tolerance of rice at different fertility stages. After the water receded, it was checked in the field in the morning, such as the tip of rice seedlings spiting water droplets, indicating that there is vitality, and it is certain that it will not die. The hand is then pinched at the base. If the base is hard, it indicates that there is still vitality. If it is already soft, it is dead. After the water receded, if it was fine and dry, the rice seedlings withered and withered, indicating that they had died. If you do not fall into a bow, you can still restore vitality. When the affected rice is reclaimed, the floater can be removed with water withdrawal, which can reduce the pressure of the rice seedlings and the rot of the seedlings. At the same time, with bamboo rafts oscillating back and forth during water withdrawal, the sediments that are contaminated with the stems and leaves are washed away, and the rice seedlings are restored to a good life. After the occurrence of aphid damage, according to the growth of rice seedlings, appropriate application of available fertilizers to promote tillering or long ear; spraying fungicide and other fungicides to prevent bacterial leaf streak or bacterial blight hazards. However, the heavy rain disaster is caused by flash floods caused by short-term heavy rain or mud-rock flow damage to rice plants. The degree of damage is related to erosion speed, duration, and sediment content. Rice disasters caused by flash floods are different from soaking disasters. Due to high sediment content in mountain flooding, even if rice is not washed away, the rice leaves are covered with muddy water after retreating, affecting the permeable and photoconductive leaves, and the leaves are easy to die. A little longer will kill the whole plant. The production should be based on the occurrence of the disaster, take remedial measures, or change crops such as late rice and corn.
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