Low temperatures, rain, and unfavorable rapeseed growth

Continuous low temperature and rainy weather is not conducive to the growth and development of rapeseed. The Hunan Provincial Department of Agriculture recently introduced technical measures to guide farmers to grasp the late cultivation of rapeseed, reduce the adverse effects of low temperature and rainy weather, seize the high yield of rape, and at the same time for the early rice production season for the initiative.

Since the beginning of this year, the long-term low-temperature and rainy weather in Hunan Province has caused weak growth of rapeseed in some areas and slow growth and development. According to weather forecast, from March to April this year, the number of low-temperature and rainy days will still be higher than usual.

Technical measures introduced by the agricultural sector include:

Strengthen the drain ditch. It is necessary to promptly clean up the "three ditch" (xianggou, Yaogou and Weigou) of rape fields. For the “three channels” shallow and poorly drained plots, the depth of the “three channels” should be increased to ensure the open channels, prevent the accumulation of water in the fields, reduce the humidity in the fields, improve the soil permeability, and reduce the water stain on the rapeseed. harm.

Pusch leaf fertilizer. In order to promote plant growth and development and increase grain weight, it is necessary to apply boron fertilizer, potassium dihydrogen phosphate and other foliar fertilizers during the bolting period to the initial flowering period of rapeseed. The rapeseed, which has already exhibited symptoms of boron deficiency, has to increase the amount of boron fertilizer and spray times. At the end of the fertilization, Miaofei more, Miao color good field, not topdressing nitrogen fertilizer, so as not to cause lodging, affecting rapeseed production.

Prevent pests and diseases. At present, we must focus on the prevention and control of pests and diseases such as sclerotinia and locusts. Before the onset of Sclerotinia sclerotiorum, we must use carbendazim, thiophanate-methyl, mancozeb, and other agents to prevent and treat sclerotinia. In the case of a locust-infested field, it should be promptly treated with quinones, chlorfenone, and other agents.

Timely harvest. In the later stage of rape growth, some old leaves and yellow leaves should be removed to increase the ventilation and light transmission of the plants and accelerate the development of the plants. Using rapeseed with ripening characteristics, three-cooked rapeseed can be cut down before about 5 days of ripening, moved away from the field, and allowed to ripen and thresh afterwards to free up field plots for early rice production and win time for the production of early rice.

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