Returning to the hidden dangers of rapeseed fields need to be strengthened

Last year, the quality of rapeseed planting in our province was high, and there was a large proportion of strong seedlings before winter. During the winter, there was no extreme weather, and the degree of cold damage was mild. However, there are also some problems that cannot be ignored. In particular, the common cold springs and continuous rainy weather in spring still pose a great threat to the growth of rapeseed.

According to the survey, there are currently four major problems with rape in our province. First, there is an imbalance in the seedlings. Rapeseed grows more prosperously in some areas, and nutrient consumption is too high. If fertilization is not applied early, it can easily lead to “poor twitching”. At present, the province's rapeseed has fallen by about 20% (1.07 million mu) of Daejeon rape. In addition, about 10% (53.8 million mu) of the area was prosperous and sealed off in advance, and timely control was needed to avoid field cover and affect plant branching. The second is that the weed base is large. If it is not well controlled, weeds will form. The third is the hidden dangers of late spring cold. The ability of anti-freezing and cold-resisting of rapeseeds after a bud twitching sharply declines. In the case of low-temperature cold weather below 0°C and a long duration, it may lead to cracking and even breaking of the "cold spring" cold damage of rapeseed pods, and aggravate the spread of disease transmission. Fourth, there are hidden dangers of waterlogging. Rape in the province is concentrated in the area south of the Huaihe River. Continuous rainy weather often occurs in spring. Rapeseed is in a period of rapid root enlargement after convulsions. Once it encounters continuous rainy weather and poor drainage in the field, it will be affected by stains, resulting in poor root activity, reduced absorption capacity, yellowing of leaves, and aggravating the occurrence of sclerotia. And hazards.

As the temperature gradually rises in the spring, rapeseed field management must be strengthened according to the weather, seedlings, and lyrics, so as to fully inhibit ineffective growth and promote effective growth. The first is to promote weak control and strong growth early. Overwintering growth is not enough weak seedlings field, or because of pre-winter prosperous, rapeseed field has fallen off yellow, early application of green relay fertilizer to promote growth, application of urea per acre about 7.5 kilograms. Normally growing plots should control the application of fertilizers in early spring to avoid ineffective growth and create conditions for re-applying rapeseed crops. At present, the prosperous canola field can be sprayed with an appropriate amount of uniconazole before it is convulsed. The second is to prevent pests and weeds in time. Mastering the "cold-tail warmer" before the rapeseed twigs, when the average daily temperature is above 8 °C, the drug will be eliminated. In the rape field where the leaves are frostbite, we must promptly remove the frostbite leaves with obvious water stains to prevent the invasion of the bacteria from the frostbite and affect the whole plant. In addition, we must strengthen the prevention and control of pests and diseases such as viral diseases, aphids, and sclerotinia. Third, according to the situation of the seedlings, it is appropriate to re-apply and reapply fertilizer. In case of cold frost damage in winter, urea can be applied for 5 to 7.5 kilograms per mu to restore fertilizer. Fourth, in-depth investigation before twitching to ensure the smooth flow of the ditch to prevent waterlogging.

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