Heavy application of flower fertilizer to promote high yield of sesame

Sesame grows most rapidly when it enters the flowering and capsule stage, when vegetative growth and growth go hand in hand, and it is also the peak period for fertilizer, which accounts for 70% and 80% of the nutrients absorbed during the whole growth period. Practice has proved that topdressing flower fertilizer can increase the yield by more than 30%. Flower fertilizer to the application of chemical fertilizer is more convenient, but also can use mature cake fertilizer, manure, barnyard manure and so on. Strip sowing should be ditched or applied in the middle of the row and applied into the soil layer of about 10 cm to absorb the root and cover the soil after application to remove weeds in the field. In the case of sowing, except for the rotten cake fertilizer or granular urea, which can be mixed with soil, and then ploughed and loosened to cover the fertilizer, all kinds of chemical fertilizers should be applied and must not be applied, so as to prevent fertilizer from adhering to the hairs of sesame leaves and causing seedling burning. When the weather is dry, irrigation after application can give full play to the effect of fertilizer. Generally, 5kg of urea is used per mu.

In addition, from the beginning of flowering to the full flowering stage of sesame, foliar fertilizer should be sprayed. Sesame has upright stem, broad leaves, dense hairs on stems, leaves and flowers, strong ability to receive and attach fertilizer, low cost of foliar fertilizer spraying, high efficiency and good effect of both water and fertilizer. Fertilizer spraying can also be combined with the control of diseases and insect pests. According to the experiment, when potassium dihydrogen phosphate solution was sprayed twice at flowering stage, the 1000-grain weight increased by 0.09 g and the yield increased by 19%. Spraying twice, that is, spraying once in the early flowering stage, spraying the second time every 5-7 days, generally using 200-250 grams of potassium dihydrogen phosphate per mu, diluted with water of 50-62.5 kilograms and sprayed on both sides of the leaves, should choose cloudy days or sunny evenings, avoid the interference of high temperature and dry-hot wind when spraying fertilizer, reduce the evaporation of water in nutrient solution, and be more conducive to the absorption of nutrients by leaves.