What are the management methods for sunflowers during the growth period?
How do you manage sunflowers during the growth period? Please give an introduction. Sunflowers during the growth period can be managed by referring to the following methods: 1. Reasonable topdressing. From the bud stage to the flowering stage, apply 150 kg of urea per hectare, about 15 cm from the roots, by furrow application or hole application; at the full flowering stage, spray 0.2%-0.4% monopotassium phosphate, depending on the growth condition, apply once or twice.
How do you manage sunflowers during the growth period? Please give an introduction
Sunflowers during the growth period can be managed by referring to the following methods:
1. Reasonable topdressing. From the bud stage to the flowering stage, apply 150 kg of urea per hectare, about 15 cm from the roots, by furrow application or hole application; at the full flowering stage, spray 0.2%-0.4% monopotassium phosphate, depending on the growth condition, apply once or twice.
2. Removing branches and protecting leaves. When branches appear, they should be removed in time so that nutrients are concentrated in the flower head on the main stem, ensuring that the seeds are plump and full. Branch removal should be done early, while the branches are small, and thoroughly; when removing branches, care should be taken not to damage the plant. In sunflower production, leaves should not be removed; care should be taken to protect the leaves, especially the leaves in the middle and upper parts of the plant.
3. Supplementary pollination. The time for manual supplementary pollination should be when more than 70% of the sunflower plants in the entire field have flowered, and the first pollination should be carried out 2-3 days after a single head flowers; afterward, pollinate once every 3 days, for a total of 2-3 pollinations. The daily pollination time should be after the morning dew disappears and before 11 a.m. If it cannot be finished in the morning, it can be done after 3 p.m. Manual supplementary pollination can use the "powder puff" pollination method, that is, using cardboard or plastic board, cotton, and clean gauze to make a "powder puff," and gently tap the flower heads in sequence.
4. Strengthen pest and disease control. The diseases commonly occurring in sunflower production mainly include sunflower sclerotinia and downy mildew, and the main pest is the sunflower moth. To control sunflower sclerotinia, agents such as procymidone, vinclozolin, and dimethachlon can be selected for spray control at the early stage of head formation. To control sunflower downy mildew, agents such as dimethomorph, propamocarb, and oxadixyl can be selected for control. To control the sunflower moth, Bt emulsion can be selected or trichogramma cards can be released in the field for control.
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