Method for increasing the seed setting rate of oil sunflower
Oil sunflower is a favorite fertilizer crop. The advantages and disadvantages of water and fertilizer conditions have a close relationship with reducing the shell rate of oil sunflower and increasing the yield.
1 The rational use of natural precipitation is an effective way to reduce the empty shell rate. Oil sunflower has strong drought resistance, and it is a kind of crop that needs more water from the breeding period, but too much rain will affect pollination and increase the spread of diseases.
2Scientific fertilization is an effective measure to reduce empty shells. Oil sunflower is a fertilizer crop. Fertilizer deficiency is not only unfavorable for plant development, but also has a direct impact on the formation and development of flower organs. In particular, the empty grains in the central part of the disk will increase. .
3 Artificial snoring is a good way to reduce nutrient dispersion. The oil sunflower has branching characteristics. Therefore, the branch buds should be promptly knocked out as soon as they emerge.
(2) Artificially assisted pollination
In the case of insufficient insects and bees, artificially assisted pollination is an effective way to increase the seed setting rate. After flowering, the viability of pollen and the stigma without pollination were maintained for 10 days. Pollen is the most energetic period during the first 2 to 3 days of flowering. Therefore, artificial supplementary pollination should be started when the oil sunflower enters the flowering period of 2-3 days.
(3) timely late broadcast
Within a certain temperature range, the lowering of temperature will favor the increase of seed setting rate, and the appropriate adjustment of the sowing date during production will avoid the high temperature during the flowering period, which will help to increase the seed setting rate of oil sunflower.
(4) Regional planting
When the sunflower is planted, it is planned to plant regionally. It is necessary to avoid the planting of sunflower and oil sunflower, and to keep the sunflower planting area away from vegetables and cotton areas as much as possible, because more pesticides are used in the production process of these crops, resulting in the lack of bees. The willingness to carry out activities in the surrounding oil sunflower plots directly affects the improvement of the seed setting rate.
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