The best time and method of sesame topdressing
Seedling stage: Because the nitrogen fertilizer at the bottom is too easy to make the seedlings grow and form high seedlings, the sesame seedling period generally only uses part of the nitrogen fertilizer as the base fertilizer. The masses have the saying that "seeing seedlings and fattening". When the seedlings are very poor or the seedlings differ in size, the seedling fertilizer can be applied in small amounts to dilute the mature manure or urea. Because the sesame root system is shallow at this time, it should be applied shallowly when fertilizing.
The bud stage: This period is the flower bud differentiation period. The sesame vegetative growth and reproductive growth go hand in hand at the same time. Topdressing should be based on nitrogen fertilizer, supplemented by phosphorus and potassium fertilizers. Boron fertilizer should be applied in areas where boron is absent.
Flowering stage: The sesame grows most rapidly during the flowering stage, and the nutrients absorbed in this period account for 70%-80% of the whole growth period. In order to meet the needs of plant growth and development, the sesame grows vigorously, accumulates more photosynthetic products, increases the number of flower buds, and the long-term stability does not prematurely decay, so that the grain is full and full, and the flower fertilizer must be re-applied. At this time, the lateral roots have begun to form in large quantities, the absorption capacity of the root system is enhanced, the growth rate of the plants is accelerated, and the demand for nutrients is also significantly increased. It is convenient to use fertilizer when fertilizing, and it is also possible to apply decomposed cake fertilizer, manure, and manure.
The fertilization method in the above periods is as follows: when the seeding is carried out, about 10 cm away from the sesame plant, the ditch strip is applied or applied, and the soil layer is applied to a depth of 10 cm to absorb the roots and apply the soil after the application; according to the test, each acre is applied. The same fertilizer, shallow application (10 ~ 13 cm) than the deep application (25 cm) increased production by about 11%. In the case of spreading, the decomposed cake fertilizer or granular urea can be mixed with soil, and then cultivating the soil to cover up the soil. When the weather is dry, water should be sprayed after application to fully exert the fertilizer effect.
In the flowering period, the root dressing can also be carried out as follows: On a sunny afternoon, the leaves are sprayed with 0.3% to 0.4% potassium dihydrogen phosphate, and sprayed three times, every 5 to 6 days. After spraying, it should be re-sprayed in case of rain.
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