1, in the same seedbed, the same site, the emergence of different time, have a few days difference, to bring difficulties to seedbed management.
The reason is poor seed quality, such as inconsistent maturity, new seeds, and old seeds. When priming, the panning is uneven and the germination is uneven.
2, in different parts of the same seedbed, some places emerged early, and some places emerged late.
The reasons are as follows: 1 The seedbed is uneven and the bottom water is poured unevenly, causing the wet place to emerge first and the dry place not to emerge. 2 The temperature is different, the north of the bed is sunny, and the temperature is higher than the shade in the south. 3 The wiring of the warming line is irrational, the temperature at the dense line is high, and the emergence is quick. 4 The thickness of the cover soil was inconsistent after sowing, and the emergence of the cover at the thick soil was late. 5 Insulation condition of seedbed cover is poor, and some places have air leakage, and the temperature is low, affecting seedling emergence. 6 Frequent leakage of rain makes the soil in the bed soil too wet, resulting in low temperature and high humidity, which is not conducive to emergence. 7 There are lice, cockroaches, rats, and other damage. 8 Using the method of watering after sowing first, irrigate alluvial water to make the seeds unevenly distributed.
According to the reasons for the emergence of malaria, the following preventive measures can be taken: 1 Before germination, germination tests should be conducted, and seeds with fast germination and high germination rate should be selected. 2 During the soaking and germination process, diligent turning. 3 Prepare nutrient soil to make bed soil fertile and free of disease, insects and rodents. 4 The bed should be leveled and filled well before filling. 5 sowing uniform, uniform cover. 6 Strengthen management after sowing so that the temperature, humidity, and air permeability of each part of the seedbed are consistent.
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