This spring, from March to April, suffered from cold weather “cold and cold†twice. The mulberry was frozen and the mulberry buds were frozen to death. The mulberry germination was postponed. According to the survey, the mulberry germination in the mountainous area of ​​southern Anhui was postponed for 10 to 12 days, and the silkworm species were delayed by about one week. Therefore, in order to ensure that the silkworm leaves are not lacking, all localities must guide the silkworm farmers to carry out 1 to 3 times of mulberry leaf surface dressing. The foliar dressing is a method of spraying the water-soluble fertilizer liquid on the mulberry leaf during the growth of the mulberry tree to absorb nutrients from the leaves and improve the yield and quality of the mulberry leaf. It has the characteristics of absorption, quick effect, and high fertilizer efficiency. .
Specific method: It should start 20~25 days before the silkworm leaves, and stop spraying one week before leaf use. The spraying time is preferably selected after sunny morning dew or dry evening, and the spraying area is mainly on the back of leaves and young leaves, because the absorption rate of nutrients on the back of leaves and leaves is much higher than that of the old leaves and leaves.
Mix urea (0.5%), potassium dihydrogen phosphate (0.2%) or urea (0.5%), superphosphate (0.5 to 1%) mixture evenly on the back of the middle and upper leaves to spray The leaves just drip for the degree, acres of spray 2 to 3 barrels, 3 to 5 days once, 2 to 3 times to see the color of the leaves deepened. At the same time, the combination of mulberry picking at the fourth instar period in order to increase the yield and quality of mulberry leaves ensures the production of leaves for spring silkworm production.
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