After October, the weather turned cold and sunshine fell dramatically. Bitter gourd entered the final stage of production. The investment in bitter gourd was relatively reduced during this period, and the sales price of products gradually increased. During this period, due to the aging of the root system and the extensive use of nutrients in the soil, the focus is on the recruitment of foliar fertilizers. Foliar spray fertilizer is a kind of economical and effective fertilization method. Foliar fertilizer can supply nutrients needed by crops in a timely manner because it contains many nutrients, promotes crop growth, and achieves strong seedlings, disease resistance, sterilization, yield increase, and improvement. The role of quality, sometimes mixed with pesticide spraying, can simultaneously take into account the dual role of disease prevention and treatment. The commonly used types of foliar fertilizers mainly include urea, potassium dihydrogen phosphate, superphosphate, potassium sulfate, and various trace element fertilizers. Other types of high-level foliar fertilizers include: 1. Humus Foliar Fertilizer: Generally, rot Ammonium and ammonium humate are used as raw materials, compounded with nitrogen, phosphorus and potassium or trace elements, and there are two solid and liquid dosage forms; 2. Amino acid leaf fertilizer: mainly amino acid composition, and trace elements Free or complex state exists, easily absorbed by crops; 3, trace element foliar fertilizer: Trace element fertilizer application amount is small, but the soil is easy to fix, thus reducing the application effect. When fertilizing the leaves, the amount of nutrients absorbed by the leaves is related to the length of time the solution wets the leaves. The longer the moistening time, the more nutrients the leaves absorb and the better the effect. In general, it is appropriate to keep the wet time of the leaf at 30-60 minutes. Therefore, the best application of foliar fertilizer is in windy weather in the evening. Spraying fertilizer in the morning with dew will reduce the concentration of the solution and affect the effect of fertilization. Before the rain or the rain, the foliar dressing cannot be carried out because the nutrients are easily lost and cannot be used properly. If the rain falls 3 hours after spraying, the spray should be sprayed once when the weather is fine, but the concentration should be reduced appropriately. Spraying should be uniform, meticulous, and considerate. The foliar application requires fine droplets and even spraying. Special attention should be paid to the backside of the upper leaves and leaves that are sprayed vigorously. The back of the leaves absorbs nutrients more quickly than the front, and has strong absorption capacity. The number of sprays should not be too small and there should be intervals. The concentration of top-dressing crops is generally low, and the amount of uptake per time is very small, which is much lower than the demand for crops. Therefore, the frequency of foliar application should generally not be less than 2-3 times; due to more than 10 months of autumn rain, it is generally unnecessary to carry out field replenishment. In the light rain, the fertilizing material or urea plus potassium sulfate plus monoammonium phosphate can be mixed evenly on topsoil, which can save labor costs for fertilization. The pests of bitter melon after October are mainly epidemics. The prevention and control method is to select the time when the weather is good, and pay close attention to the spraying of liquid medicine. If it encounters continuous rain and rain, it is best to choose the spraying of dust agent. Drugs can choose 64% anti-drug WP, 25% wet fungal wet powder, 40% EB 200 times, 25% metalaxyl, 58% MnZn WP, 5 ~ 7 days of medication Once, use 3 to 4 times. Or use 75% chlorothalonil 600 times solution, 50% cefotaxime 5000 times, 64% antiviral M8 WP 500 times, 25% trefenrel, and 54% thiram 1:1 mixture to root. Or use dust.
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