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Soil temperature and humidity were recorded and controlled by a soil temperature and humidity recorder. Soil temperature gradients were set at 9 temperature settings of 5, 10, 15, 20, 25, 30, 35, 40, and 45°C. Soil moisture gradient: 20%, 40%, 60%, 80%, 100% total 5 soil relative water content gradients. No light conditions, air humidity (70 persons 7%). Both soil temperature and air humidity are set by the artificial climate box. Soil moisture setting method: Put the non-polluted soil sample 3509 ready to dry to a constant weight into a triangle funnel (12 m in diameter), add a certain amount of water in the funnel until the funnel starts to drip, and then use The sealing film closes the top of the funnel. After 24 h, the water content in the saturated soil sample was determined. The moisture content of this 24 h saturated water was set at 100%, and other moisture content was taken as the standard. Weigh a quantitative amount of non-polluting soil samples that have been baked to constant weight to a diameter of 9. In the petri dish of m, add the person's quantitative water to achieve the required soil moisture content. The soil sample was then stirred well, capped, sealed in an incubator, placed at the temperature of the test to be placed for 24 to 48 hours, and then ready for sowing. Each dish was sown with 30 seeds of the crabgrass seed so that the seeding depth was 0.5. m is about. Each petri dish was sealed with a sealing membrane to prevent evaporation of the water and then weighed (to observe changes in soil moisture). 3 repetitions. At fixed temperature, the germination test of crabgrass was carried out under different soil moisture content.
By using a soil temperature and humidity recorder to compare the soil temperature and humidity with the emergence of crabgrass, the optimum seedling emergence relative humidity was 60%. The seedling emergence rate was very low at 100% relative humidity and the maximum seedling emergence rate was only 40%. (25°C). This is mainly due to the fact that under high humidity, the seeds do not have enough oxygen for germination. When the high humidity is accompanied by a high temperature condition, the seeds are often first moldy because they are not germinated, thereby reducing the seedling emergence rate of the crabgrass seeds. When the relative moisture content of the soil is too low, the water needed for the seed of the crabgrass seedling cannot be supplied without germination. Therefore, if the relative moisture content of the soil is 20%, no emergence of the crabgrass seedlings can be found within 21 days at any temperature.
Analysis of Soil Temperature and Moisture after Matang Seedling Emergence with Soil Temperature and Humidity Recorder
As a kind of weedy weed, crabgrass has the same emergence time as other weeds. It is affected by environmental conditions such as soil environment and soil temperature and humidity. The occurrence of each weed has its optimum temperature and humidity. Therefore, in order to understand the emergence of crabgrass, we must conduct a profound analysis of its soil temperature and humidity conditions. It is of great significance to study and establish the influence of temperature and humidity interaction, depth of seed burial, and other conditions on the emergence of crabgrass in the prediction of the emergence and damage of crabgrass and the corresponding measures to control the occurrence of crabgrass. For the determination of soil temperature and humidity can use the soil temperature and humidity recorder for analysis.