What are the reasons for uneven corn seedling emergence
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Why corn seedling emergence is uneven
Author: Article source: Agricultural Station of Qijia Town, Shuangyang District, Changchun City, Jilin Province Published: 2018-02-07 Clicks:
The phenomenon of uneven corn seedling emergence often occurs in production practice. Because of uneven emergence, corn density is reduced, which directly affects corn yield. The main reasons for uneven corn seedling emergence are as follows:
1. Extensive tillage quality
Tillage depth is inconsistent, the plow layer is relatively shallow, soil clods vary in size, and land preparation is uneven and not level. After corn sowing, seeds in soil with little moisture and pressed by larger clods emerge more slowly, or even struggle to emerge.
2. Poor corn seed quality
Differences in corn seeds themselves affect uneven emergence. First, when corn seeds are harvested and encounter rainy weather with high moisture content, they are prone to mildew, and the seed germination rate decreases; second, there is the difference between coated seeds and uncoated seeds: uncoated seeds emerge quickly, but the seedling survival rate is low, while coated seeds emerge slowly but have a high seedling survival rate; third, seeds that suffer mechanical damage during threshing, fine selection, transport, and coating after harvest have a low germination rate and a low emergence rate.
3. Poor sowing quality
Sowing depth is inconsistent, and the thickness of the covering soil is also inconsistent. Seeds sown deep with thick covering soil emerge slowly, while those sown shallow with thin covering soil emerge quickly, but shallow-sown seeds are easily washed away by rain and directly exposed to the sun, making it difficult for them to germinate, directly affecting emergence.
4. The influence of adverse weather factors
In drought weather, soil moisture is insufficient, and sowing is often done for drought resistance, which affects the quality of corn emergence; in addition, after long periods of rain, soil moisture is excessive, and corn seeds are prone to rotten sprouts and dead seedlings.
5. The harm of harmful organisms
Especially uncoated seeds, which are most likely to suffer diseases and insect pests, thereby causing uneven corn seedling emergence.
The main preventive measures against uneven corn seedling emergence:
1. Intensive cultivation and leveling the land
Deeply plow the land before sowing, with consistent depth, and harrow it level and fine, with no large clods, uniform and consistent.
2. Improve sowing quality
Select excellent disease-resistant varieties and promote the use of coated seeds; when sowing, keep the depth consistent, avoid covering soil too deeply or too shallowly, and keep the covering soil as uniform and consistent as possible.
3. Prevent and control harmful organisms
The best way to prevent and control rodent damage, diseases, and insect pests is to use coated seeds, because coated seeds contain insecticides, fungicides, and plant growth regulators.
1. Extensive tillage quality
Tillage depth is inconsistent, the plow layer is relatively shallow, soil clods vary in size, and land preparation is uneven and not level. After corn sowing, seeds in soil with little moisture and pressed by larger clods emerge more slowly, or even struggle to emerge.
2. Poor corn seed quality
Differences in corn seeds themselves affect uneven emergence. First, when corn seeds are harvested and encounter rainy weather with high moisture content, they are prone to mildew, and the seed germination rate decreases; second, there is the difference between coated seeds and uncoated seeds: uncoated seeds emerge quickly, but the seedling survival rate is low, while coated seeds emerge slowly but have a high seedling survival rate; third, seeds that suffer mechanical damage during threshing, fine selection, transport, and coating after harvest have a low germination rate and a low emergence rate.
3. Poor sowing quality
Sowing depth is inconsistent, and the thickness of the covering soil is also inconsistent. Seeds sown deep with thick covering soil emerge slowly, while those sown shallow with thin covering soil emerge quickly, but shallow-sown seeds are easily washed away by rain and directly exposed to the sun, making it difficult for them to germinate, directly affecting emergence.
4. The influence of adverse weather factors
In drought weather, soil moisture is insufficient, and sowing is often done for drought resistance, which affects the quality of corn emergence; in addition, after long periods of rain, soil moisture is excessive, and corn seeds are prone to rotten sprouts and dead seedlings.
5. The harm of harmful organisms
Especially uncoated seeds, which are most likely to suffer diseases and insect pests, thereby causing uneven corn seedling emergence.
The main preventive measures against uneven corn seedling emergence:
1. Intensive cultivation and leveling the land
Deeply plow the land before sowing, with consistent depth, and harrow it level and fine, with no large clods, uniform and consistent.
2. Improve sowing quality
Select excellent disease-resistant varieties and promote the use of coated seeds; when sowing, keep the depth consistent, avoid covering soil too deeply or too shallowly, and keep the covering soil as uniform and consistent as possible.
3. Prevent and control harmful organisms
The best way to prevent and control rodent damage, diseases, and insect pests is to use coated seeds, because coated seeds contain insecticides, fungicides, and plant growth regulators.
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