Since March, the overall temperature in the Yangtze River basin has been high, the birthing process of rape has accelerated, and the flowering period is about one week earlier than usual. At present, most of the rapeseed in the Yangtze River Basin is in the flowering stage, and the upper reaches of the Yangtze River Basin have entered the late flowering stage and are about to be transferred to the mature stage of pods. The late planting rape in the downstream areas has also entered the initial flowering stage. The flowering and fruiting period is the critical period for the formation of rapeseed yield. The total number of pods, pods, and grain weight are determined during this period. It is very important to grasp the current field management.
The first is the scientific application of pest control. The main anti-sclerotia and aphids. In the early flowering period of rapeseed, it is necessary to fully carry out prevention and control of sclerotinia. Generally, 50 ml of 25% chlorpheniramine EC or 40% sclerotium net WP is used per mu, and the entire plant is sprayed with 50-75 kg of water. Spray as much as possible to the lower part of the rape stem in order to improve control efficiency. Heavy-field interventions are again controlled 5-7 days apart. Conditions should actively promote the use of drones or large mechanical sprays to improve the effectiveness of spraying and operating efficiency and reduce the cost of prevention and control. After spring, the temperature rises rapidly, and rape locusts are susceptible to outbreaks. Measures should be taken to prevent them in time. 10-20 grams of 10% imidacloprid per acre can be used, and 50 kg of water can be sprayed for prevention and treatment.
The second is spraying fertilizer to prevent premature aging. In the flowering period of rapeseed, combined with the prevention and treatment of Sclerotinia sclerotiorum, foliar spray fertilizer can prolong the functional period of photosynthetic organs, promote the conversion and operation of sugar, increase the number of pods, increase the number of grains, and increase grain weight. Foliar spray fertilizer is generally dominated by phosphate fertilizer, potash fertilizer, and boron fertilizer, but it is also necessary to spray nitrogen fertilizer on fields with poor growth and premature aging trends. Generally, 100-150 grams of potassium dihydrogen phosphate, 150-200 grams of urea, 50-100 grams of available boron fertilizer, and 50-75 kilograms of uniform water are sprayed per acre. Spray enough moisture to fully moisten the foliage.
The third is clearing the ditch and lodging. The Qinghai period is a crucial period for preventing the lodging of rapeseed, especially for the live rapeseed because of the finer stalks or the influence of waterlogging, and more attention should be paid to preventing lodging. For the rapeseed field that is still in its flowering period, it is necessary to increase the prevention and control of sclerotinia and reduce the risk of lodging caused by diseases. In early spring, some areas of the Yangtze River have increased rainfall, and it is necessary to clean up the ditch system as soon as possible, especially in the field of rice and paddy. It is also necessary to pay attention to flood prevention and flood prevention to prevent loose soil from causing lodging. Larger transplanted rapeseeds can be protected from lodging by fences and partitions.
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