Due to abnormal climate change during the seedling stage of rapeseed, the temperature is high and low, the temperature is high in the early stage, the rapeseed is prosperous, and the short-lived rain and snow cool down on March 12, causing various degrees of cold damage to the rape. The recent temperature rises and the rape grows hard. Adaptation caused longitudinal cracking of some early maturing and early-harvest rapeseed stalks. In addition to the weather, some of the above-mentioned phenomena are caused by the lack of boron in some plots, excessive humidity in the field, sufficient nitrogen fertilizer, and low phosphorus and potassium fertilizers. This situation can easily lead to disease in the late stage of rape growth. To this end, special management measures are proposed for the reference of farmers' friends in production. First, spray fertilizer. Before the flowering, 50 grams of liquid boron fertilizer per acre, 100 grams of potassium dihydrogen phosphate, uniform spray, can play a role in increasing flower, increasing angle and increasing grain weight. Second, the ditch drainage, flood control and stain removal. In our province, there are more rains in spring, especially the high groundwater level of rice blast, which is not conducive to root activity, causing premature senility, and is likely to cause the spread of germs and increase the harm of sclerotinia, thus affecting the high and stable yield of rapeseed. Therefore, field trenches should be cleared and opened to keep the "three channels" open and ensure that there is no water accumulation in the rain. 3. Spray plant growth regulator "802" to enhance crack resistance and promote rapid recovery. Fourth, comprehensive prevention and control of pests and diseases. Spring is a time when pests and diseases occur in rapeseed, and pest and disease control efforts must be strengthened everywhere. In the aspect of chemical control, the following measures can be taken according to the types of pests and diseases: 50% carbendazim suspension 50-50 kg per acre can control downy mildew; use 10% of the net 20 grams Water can control aphids; with 50% carbendazim (carbendazim) WP 80-100 g water 50-75 kg, in the early flowering spray can control Sclerotinia, generally to control 2 times. In addition, we must remove the old leaves in time, remove the weeds manually, increase the permeability of the field, and reduce the occurrence of diseases.
Sampling Cotton Swabs,Nylon Flocked Swab,Small Foam Tip Swab ,Cotton Tipped Swabs
Hunan Kangfutai Medical Devices Co., Ltd. , https://www.3kfut.com