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In order to alleviate the adverse effects of drought and low temperature on the growth of rapeseed, at present, in the field management of rapeseed, it is necessary to take water and fertilizer as the main factor, adopt comprehensive measures to promote the transformation of seedlings, base on disaster prevention, and strive for a good harvest of rapeseed.
Grasping the time of farming, strengthening management of all the rape fields that have preserved the whole seedlings, should not give up, as long as the management is fully able to capture the harvest. First, there are many precedents in the history of disaster relief and harvest; second, the temperature is warming up, the process of rapeseed is very fast, especially the flower buds are rapidly differentiated; third, there is sufficient time to promote the transformation of rapeseed seedlings, strengthen management, and control, Discard it.
With water fertility and classification, most of the rapeseed has entered the bud stage, near the flowering stage, and it is also the period when rapeseed requires the most fertilizer and fertilizer. Early application of heavy fertilizer is to promote the steady growth of rapeseed and more branches. It is one of the effective measures to prevent the shedding and the weight of the grain. Recently, many areas like to drop to moderate rain, should seize the favorable sensation, distinguish the seedlings, grab the early application of fertilizer, to achieve water and fertilizer. For general field rapeseed, when the vegetable meal is as high as 10~20 cm, 10~15 kg of urea can be applied per acre. The wax fertilizer is applied more adequately, and the soil fertility is better. When the rain is frequent, the fertilizer can be applied less or late. The leaves are hypertrophy, and the dome is lower than the tip of the leaf. Excessive application of manure will cause rapeseed to be late and ripe, increasing shade and causing disease. For the soil that has not been applied with boron fertilizer or boron deficiency in the early stage, 0.2% of the speed liquid boron solution can be sprayed 60-70 kg per acre, and it can be sprayed with urea or potassium dihydrogen phosphate or Huimanfeng active liquid fertilizer.
Eliminate waterlogging, prevent disease and prevent oil from entering the flowering and pod-forming period from the bud stage, and gradually increase the shade in the field. If the rainfall continues, the soil water content will increase, which is not conducive to the development of the root system and the absorption of fertilizer, but is beneficial to the sclerotia. The occurrence of diseases and insects can easily lead to lodging. Therefore, we must not neglect the cleaning of the field ditch, to make clear water discharge, dark water quick filtration, rain to live in the field, to promote roots, prevent lodging, and prevent disease. For fertilizers and long-lasting rapeseed, plant growth regulator paclobutrazol should be sprayed. The dosage per acre is 15% paclobutrazol wettable powder 40~50g, and 40kg spray. Spraying paclobutrazol can effectively control the main stem and branch height of rapeseed, inhibit the prolonged leaves, and enhance the lodging resistance, disease prevention and yield increase.
(Yu Hongzhang, Senior Agronomist, Agricultural Bureau of Xiaogan City, Hubei Province)
According to a multi-point survey in rape fields in late February, the growth of rapeseed in some areas of Hubei is worse than normal. First, the number of effective seedlings is small, and some farmers will replant the rapeseed seedlings, which are sparsely populated; Insufficient hair growth; the third is that many rapeseed seedlings have suffered from freezing damage, and 2 to 3 leaves of the base have been frozen to resemble scald necrosis; fourthly, there are symptoms such as deficiency of nitrogen, phosphorus, potassium and boron to some extent, and some leaves and petioles It is red, some of the lower leaves are rolled, some of them are longitudinally contracted, and the growth of the top leaves is not flat enough. These conditions have made it difficult to produce high-yield rapeseed this year. The reason for the poor growth of rapeseed seedlings was that during the sowing and seedling cultivation of rapeseed last year, there were many rainy days and rapeseed failed to sow seedlings in a timely manner. Second, the sowing period was urgent. Some farmers did not apply base fertilizer and white seeds to the fields. The third was rapeseed sowing. After a long period of drought and little rain, coupled with the continuous drought after the Spring Festival and low temperature freezing damage, the growth and development of rapeseed was inhibited.
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