The phenomenon of uneven emergence of corn often occurs in production practice. Due to the uneven seedling, the density of corn is reduced, which directly affects the yield of corn. The main reasons for the emergence of corn are the following:
1. Extensive quality of cultivated land
The cultivated land is different in depth, the plough layer is shallow, the soil mass is different, and the land preparation is uneven and uneven. After sowing of corn, seeds with less water in the soil and being crushed by larger clumps are slower to emerge, and even difficult to emerge.
2, the quality of corn seeds is not high
The difference in corn seed itself affects the emergence of seedlings. First, the corn seeds are exposed to rainy weather during harvest, and the water content is high, which is easy to cause mildew and the germination rate of seeds is reduced. Second, the difference between coated seeds and non-coated seeds is not coated. The seed emergence is fast, but the seedling rate is low, the coated seed is slow to emerge, but the seedling rate is high. Third, the seed has low germination rate and low emergence rate due to mechanical damage during the process of threshing, selection, transportation and coating. .
3, the quality of sowing is not high
The seeding depth is different, and the thickness of the soil is inconsistent. The seedlings with deep soil cover are slow to emerge, and the seedlings of shallow soil cover are quick, but the seeds that are shallowly sown are easily washed by rain and the sun is difficult to germinate, which directly affects emergence.
4. Impact of adverse weather factors
In the case of dry weather, soil moisture is insufficient, and often drought-tolerant sowing, affecting the quality of corn emergence; in addition, the long-rainy soil is overwhelmed, and the corn seed is easy to cause rotten buds and dead seedlings.
5, the harm of pests
In particular, uncoated seeds are most likely to cause disease and pests, resulting in uneven emergence of corn.
The main preventive measures to prevent corn emergence:
1. Intensive cultivation and leveling of land
Deeply ploughing the land before sowing, the depth is the same, the target is flat and fine, no large clumps, uniform.
2, improve the quality of seeding
Choose excellent disease-resistant varieties and promote the use of coated seeds; the depth of seeding is consistent, avoiding over- or too shallow overburden, and covering the soil as uniform as possible.
3. Prevention and control of harmful organisms
The best way to control rodents and pests is to use coated seeds, which contain insecticides, fungicides and plant growth regulators.
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