Management of sesame after molding

Sesame molding refers to the middle and late stage of sesame seedling growth, the management of this period is very important, which is directly related to the planting benefit of sesame, so how to manage sesame after forming?

Increase fertilizer application

On the basis of sufficient base fertilizer, nitrogen fertilizer should also be applied at the first flowering stage of sesame. For summer sesame seeds that are too late to apply base fertilizer before sowing, topdressing should be applied early. Sesame needs more potassium, and 0.4% potassium dihydrogen phosphate solution can be used for foliar spraying at the beginning of flowering, usually every 5-7 days.

Timely watering

Under the condition of good soil moisture, the seedling stage generally does not need watering; the phenomenon of water shortage before budding can be watered; the flowering and capsule stage is the key period of water demand for sesame, and it is necessary to water sesame if it is dry; sesame generally does not need watering after capping.

Manual topping

Timely topping of sesame can promote the concentrated distribution of water and nutrients to the formed capsules and grains, which is beneficial to early maturity and yield increase. The suitable topping time is spring sowing sesame in mid-late July and summer sowing sesame in mid-late August. Usually topping when the lower capsule of the plant is nearly mature and the upper part is still flowering (inflorescences no longer increase). To choose a sunny day to hit the top. When topping, remove the top of the inflorescence by hand, 2 cm to 3 cm.

Prevention of diseases and insects

The main diseases harmful to sesame are stem point blight, leaf wilt, Fusarium wilt and so on, which mostly occur in the flowering and capsule stage. Specific control methods: in addition to avoiding continuous cropping and soaking seeds with 55 ℃ warm water or 5.7% cupric sulfate solution for 15 minutes before sowing, the fields that have occurred diseases can be sprayed with 40% carbendazim 500 times 800 times per mu, once every 5-7 days, 3 times 4 times.

Sesame is easy to be harmed by ground tiger, aphid and red spider at seedling and flowering stage. the method of spreading poison bait can be used to control ground tiger and internal inhaling pesticide to control aphid and red spider.

Special reminder: foliar spraying of sesame at flowering stage

Sesame has erect stems, broad leaves, dense hairs on stems, leaves and flowers, and strong ability to receive and attach fertilizer. In the whole flowering period of sesame, vegetative growth and reproductive growth are carried out synchronously, lack of fertilizer has a great impact on plant growth and yield, low cost of foliar fertilizer spraying, high efficiency, good effect of water and fertilizer, fertilizer spraying can also be combined with the control of diseases and insect pests.

1. Period and frequency of spraying. The best fertilizer spraying period is from the beginning of flowering to full flowering of sesame, avoiding rainy days, spraying once every 5-7 days.

two。 Spraying time and method. Try to arrange in the afternoon of sunny weather, choose direct spray head spray, the operation range is wide and easy to operate.

3. Spray concentration and dosage. The concentration of potassium dihydrogen phosphate sprayed is 0.4%. According to the growth situation of sesame, the application amount of pure potassium dihydrogen phosphate per mu is 300g to 400g.