(1) According to the characteristics of the variety. Under the same production conditions, spring varieties should be properly broadcasted in the evening, and winter varieties should be broadcast early. (2) According to geographical location and topography. About 100 meters above sea level, the sowing date is about 4 days earlier, the same altitude is different latitude, the general latitude is reduced by 1 degree, and the sowing date is delayed by about 4 days. (3) Accumulated temperature before winter. Spring varieties require 625 degrees Celsius before winter, weak winter varieties require 700 degrees Celsius before winter, and pre-winter varieties require 775 degrees Celsius before winter.
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Infectious diseases are caused by microorganisms, such as bacteria, viruses, fungi, and parasites.
Doctors suspect an infection based on the person's symptoms, physical examination results, and risk factors. First, doctors confirm that the person has an infection rather than another type of illness. For example, a person with a cough and difficulty breathing may have pneumonia (a lung infection). However, the person may instead have asthma or heart failure, which are not caused by infection. In such a person, a chest x-ray can help doctors distinguish pneumonia from the other possible disorders.
Once doctors confirm that the person has an infection, they usually need to know which specific microorganism is causing the infection. Many different microorganisms can cause a given infection. For example, pneumonia can be caused by viruses, bacteria, or, rarely, fungi. The treatment is different for each microorganism.
Many different types of laboratory tests can identify microorganisms. Laboratory tests use a sample of blood, urine, sputum, or other fluid or tissue from the body.
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