What are the key technical points for summer management of black sesame?
How should black sesame be managed in summer? Please give guidance. The summer management methods for black sesame can refer to the following: First, thinning and final thinning of seedlings, checking seedlings and filling gaps. Because sesame seeds are small and many seedlings emerge, after emergence, when the first pair of true leaves grows, the seedlings should be thinned; when 2-3 pairs of true leaves grow, the seedlings should be thinned again; at 4 pairs of true leaves, the seedlings should be finally thinned. Black sesame generally leaves about 8,000 plants per mu; if seedling gaps or broken rows occur due to poor soil moisture at sowing, transplanting dense seedlings to fill sparse areas or replanting after sprouting can be used to ensure full and strong seedlings.
How should black sesame be managed in summer? Please give guidance.
The summer management methods for black sesame can refer to the following:
First, thinning and final thinning of seedlings, checking seedlings and filling gaps. Because sesame seeds are small and many seedlings emerge, after emergence, when the first pair of true leaves grows, the seedlings should be thinned; when 2-3 pairs of true leaves grow, the seedlings should be thinned again; at 4 pairs of true leaves, the seedlings should be finally thinned. Black sesame generally leaves about 8,000 plants per mu; if seedling gaps or broken rows occur due to poor soil moisture at sowing, transplanting dense seedlings to fill sparse areas or replanting after sprouting can be used to ensure full and strong seedlings.
Second, intertillage and weeding, and earthing up to prevent lodging. As the saying goes, "Dry hoe millet, wet hoe cotton, neither dry nor wet hoe sesame." After thinning, shallow hoeing should be done to loosen the soil and remove weeds. When the seedlings are five cm high, carry out the second intertillage and final thinning; afterward, carry out intertillage 1-2 more times. Be careful not to damage the roots when hoeing. When the seedlings grow to about 33 cm, soil should be piled around the roots to resist wind and prevent lodging.
Third, topdressing at flowering stage and pinching the growing tip. Sesame needs much fertilizer during the flowering stage. At the early flowering stage, apply 10-12.5 kg of urea per mu as topdressing; at the full flowering stage, use 120-150 g of potassium dihydrogen phosphate or active humic acid, foliar fertilizer, etc., diluted with water for foliar topdressing; during the topping stage, choose a sunny day and remove the plant tip by hand, with a pinching length of 2 cm as appropriate. Fourth, chemical regulation to promote yield increase. After the full flowering stage, use 40-50 g of paclobutrazol per mu diluted with 25-30 kg of water and spray evenly on the leaves. Spray less on poor-growing plants, and spray an appropriate amount more and earlier on well-growing plants. This can increase yield by 8-10%.
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