How to manage the growth period of sunflower?

How to manage the growth period of sunflower? Please introduce the growth period of sunflowers can refer to the following methods of management: 1. Reasonable topdressing. From budding to flowering, 150 kg of urea per hectare is applied, about 15 cm from the root, applied in ditches or holes, and 0.2% 0.4% potassium dihydrogen phosphate is sprayed at full flowering, depending on the growth, once or twice. two。 Forking and protecting leaves. When branches appear, they should be removed in time to concentrate nutrients on the disk of the main stem to ensure that the grains are full and full. Forking should be done early, small and thoroughly, and attention should be paid not to damage the plant. The leaves should not be beaten in sunflower production, and attention should be paid to protecting the leaves, especially the leaves in the middle and upper parts of the plant. 3. Auxiliary pollination. During the period of artificial pollination, the first pollination should be carried out 2-3 days after the flowering of more than 70% of the sunflower plants in the whole field, and then pollinated for a total of 2-3 times every 3 days. The daily pollination time should be before 11:00 after the dew disappears in the morning. If it can't be finished in the morning, it can be done after 3 p.m. Artificial pollination can use "powder puff" pollination method, that is, using cardboard or plastic board, cotton, clean gauze to make "powder puff", in turn gently touch the flower plate. 4. Strengthen the prevention and control of diseases and pests. The common diseases in sunflower production are Sclerotinia sclerotiorum and downy mildew, and the insect pests are mainly sunflower borer. The control of Sclerotinia sclerotiorum can be controlled by spraying at the initial stage of setting. The control of sunflower downy mildew can be controlled by Kelu, Prike, antidote alum and other agents. Bt emulsion or Trichogramma card in the field can be used to control sunflower borer. Click to get more sunflower planting techniques click to get more grain and oil crop planting techniques