The Causes of Sunflower Empty Shell and Preventive Countermeasures

When people plant sunflowers, people feel headaches because they have more empty shells and lower yields. Many farmers feel helpless. In fact, as long as we understand the reason why sunflowers produce empty shells, there are countermeasures. 1 Main reasons for empty shell 1.1 The results of water shortage test showed that in the growing season of sunflower, sufficient water and fertilizer were available, the empty shell rate in the center of the disk was only 4%, and the empty shell rate of water and fertilizer deficiency was as high as more than 35%. If the water shortage was severe, the flower disk would All empty shells. This fully shows that the sunflower from the bud to the end of flowering is an important period for the formation of flower discs and seeds. In this period, the water demand of the plants accounts for more than 60% of the water requirement in its lifetime. If the water supply is insufficient, the seeds will be stunted and empty shells will form. 1.2 Poorly pollinated sunflowers are cross-pollination crops. According to experiments, the empty shell covered with gauze is 3 times more than the bees can approach. If rain occurs during pollination, the empty shell rate will increase significantly. 2 Technical Measures for Reducing Shell Ratio 2.1 Watering and fertilizing During the blooming and flowering period of sunflower, it is necessary to water and fertilize in time to ensure that the plants have sufficient moisture and nutrition. 2.2 Artificial pollination Make a puff that is the size of a kwai plate. Gently wipe it a few times on a faceplate, then gently wipe it on another faceplate. It is also possible to gently wipe the two adjacent plates slightly, but be careful not to hurt the stems. The two pollination methods mentioned above should be conducted until the morning of the sunny day when the sunflower blooms and after the dew is dry until 12 o'clock. It usually takes 3 to 4 times.

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