The latest Prevention and Control methods of low temperature obstacle in Maize

Corn is a kind of thermophilic crop, which has high requirements for temperature. In some years, because of low temperature, it often leads to low temperature damage of corn. In case of low temperature during sowing and emergence period, it will cause delayed emergence, thin seedlings, reduced seed germination rate, etc. This phenomenon is called hypothermia, so what about corn hypothermia? Let's take a look at it together with Xiaobian.

1. Fine soil preparation

Northern autumn should be in autumn soil preparation fertilization, soil after harrowing grinding, suppression in ridging, and irrigation conditions, should be irrigated with bottom water in autumn and winter, timely suppression, harrowing fine, so as not to lose moisture, to achieve flat ridge, fine soil, upper empty and lower solid.

2. Select improved varieties

Different maize varieties have great differences in low temperature tolerance, so we should select high-yield varieties suitable for local low temperature tolerance according to local conditions, and scientifically determine the sowing date according to climate division, so that the temperature index of each growth stage can be satisfied. The best temperature for seedling emergence from seeding branches is between 13-17 degrees, and the minimum temperature should not be lower than 10 degrees. The average temperature for seedling emergence should be higher than 24 degrees, not lower than 23 degrees. In order to facilitate photosynthesis, especially according to the late high temperature, large temperature difference between day and night is conducive to the accumulation of dry matter.

3. Reasonable close planting

After emergence, seedlings should be thinned and fixed in time, and the density should be appropriate. Plastic film mulching technology should be adopted for cultivation, so that less film is used and management is convenient. Can adopt wide narrow row or big, small ridge planting method, namely big row spacing 80 cm, small row spacing 25 cm, with 70-75 cm wide film cover 2 rows of corn, both sides pressed into the film 10 cm. It is best to maintain 3800-4500 pigs per mu, so that permeability is also better, but also can play the edge line sometimes, but also can increase production by about 10%-15%.

4. Early sowing and early mulching

Film is generally ten days and a half earlier than the open field, after sowing in the ridge on both sides of each open a ditch, about 5 cm deep, the plastic film close to the ground, elastic appropriate, film edge pressure soil tight, so that the film lighting surface in more than 35 cm. For weed breeding, you can spray chemicals on the ridge surface and cover it again, which can prevent weeds from breeding extremely well.

The above is the introduction of corn low temperature barrier control methods, I hope to help you, want to know more about the relevant knowledge, please pay attention to us.