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The application of plastic film mulching technology in dry farming areas is very extensive. The application of mulching film has significant effects of increasing temperature and water retention and increasing yield and maturing, which provides a lot of theoretical basis for agricultural production in dry farming areas. However, the application of plastic film technology will also have certain shortcomings. This is mainly because the plastic film is difficult to decompose in a short time. Residues in the soil will cause pollution and the impact of the following year. In the process of corn planting in Daejeon, mulch has a great influence on soil fertility and hydrothermal conditions. It can increase the yield of corn in dry areas and increase the income of farmers so as to promote sustainable development. The effect of plastic film on soil moisture in corn field can be measured and compared by using a multi-point soil temperature and humidity recorder.
The experiment was set up with three ridges of full-sea ridges, full-film flats and bare grounds. Three replicates were used. Randomized block design was used. The area of ​​the plot was 2. Basal fertilizer 400kg/hm2 urea and 800kg/hm2 superphosphate, double ridge full-vegetation planting, large ridge width 80cm, high 10cm, small ridge width 40cm, high 15cm; full-film flat and bare ground row spacing 60cm, spacing 30cm During the growth of corn, no fertilizer was applied, and no water was applied on the filmed land. The unpatched test land was conventionally managed. The test measures soil temperature, moisture, organic matter, available N, available P, and quick-acting K according to the growth period of corn, and the methods of determination are all conventional methods.
Through the measurement and record analysis of multi-point soil temperature and humidity recorders, during the spring maize growing season in the northern arid area, the soil temperature at the same depth and at the same depth at the same time in the plastic film-covered land was different, and all of them were bare ground. , Ridge film ditch is the highest. The surface soil moisture content of mulch film coverage was significantly higher than that of bare soil, and the ridge film cultivar was higher than that of the whole film. The reason was that ridge film cultivar cultivation techniques not only had strong conservation ability, but also had better ability to collect ineffective rainfall than the whole film. Coverage, while at the same time during the growth of corn, the difference between the harvest of corn and the end of the test after the corn's harvest decreased; with the increase of soil depth, the moisture content of the film-covered soil drastically decreased, and the soil moisture in the middle and lower layers was lower than the control.
The mulching film has a good water retention effect, and the mulch film coverage mainly improves the surface soil moisture content, but the deep soil moisture appears obvious depletion. This is mainly due to the poor mulching of the mulching film, which affects the supplement of soil water by precipitation. During the corn growing period, the temperature of all soil layers in the mulching film was significantly higher than that of bare soil. It was also consistent with most research results. Especially in the winter, the temperature of film-covered soil was significantly higher than that of no-film coverage, and the daily variation was relatively small. It can be seen that the significant warming effect of mulching film is precondition, that is, it can only be fully expressed under the high solar radiation intensity, while under the condition of low temperature and short sunshine in winter, the mulching effect of mulching film is limited.
Through the measurement of multi-point soil temperature and humidity recorders, it was found that plastic film mulching has the effect of fully mobilizing many factors and exerting the potential for increasing the yield of soil in dry areas. It has important application value for early spring crops in arid and semi-arid areas, but the annual coverage Cultivation will lead to a decline in soil fertility. Attention should be paid to the replenishment of water and fertilizers, especially the application of organic fertilizers, in order to prevent the decline of soil fertility. Otherwise, the relatively poor agricultural soils in China's arid and semi-arid regions may become more barren, which is not conducive to the cultivation of farmland soils and the sustainable development of agricultural production.
The experiment was set up with three ridges of full-sea ridges, full-film flats and bare grounds. Three replicates were used. Randomized block design was used. The area of ​​the plot was 2. Basal fertilizer 400kg/hm2 urea and 800kg/hm2 superphosphate, double ridge full-vegetation planting, large ridge width 80cm, high 10cm, small ridge width 40cm, high 15cm; full-film flat and bare ground row spacing 60cm, spacing 30cm During the growth of corn, no fertilizer was applied, and no water was applied on the filmed land. The unpatched test land was conventionally managed. The test measures soil temperature, moisture, organic matter, available N, available P, and quick-acting K according to the growth period of corn, and the methods of determination are all conventional methods.
Through the measurement and record analysis of multi-point soil temperature and humidity recorders, during the spring maize growing season in the northern arid area, the soil temperature at the same depth and at the same depth at the same time in the plastic film-covered land was different, and all of them were bare ground. , Ridge film ditch is the highest. The surface soil moisture content of mulch film coverage was significantly higher than that of bare soil, and the ridge film cultivar was higher than that of the whole film. The reason was that ridge film cultivar cultivation techniques not only had strong conservation ability, but also had better ability to collect ineffective rainfall than the whole film. Coverage, while at the same time during the growth of corn, the difference between the harvest of corn and the end of the test after the corn's harvest decreased; with the increase of soil depth, the moisture content of the film-covered soil drastically decreased, and the soil moisture in the middle and lower layers was lower than the control.
The mulching film has a good water retention effect, and the mulch film coverage mainly improves the surface soil moisture content, but the deep soil moisture appears obvious depletion. This is mainly due to the poor mulching of the mulching film, which affects the supplement of soil water by precipitation. During the corn growing period, the temperature of all soil layers in the mulching film was significantly higher than that of bare soil. It was also consistent with most research results. Especially in the winter, the temperature of film-covered soil was significantly higher than that of no-film coverage, and the daily variation was relatively small. It can be seen that the significant warming effect of mulching film is precondition, that is, it can only be fully expressed under the high solar radiation intensity, while under the condition of low temperature and short sunshine in winter, the mulching effect of mulching film is limited.
Through the measurement of multi-point soil temperature and humidity recorders, it was found that plastic film mulching has the effect of fully mobilizing many factors and exerting the potential for increasing the yield of soil in dry areas. It has important application value for early spring crops in arid and semi-arid areas, but the annual coverage Cultivation will lead to a decline in soil fertility. Attention should be paid to the replenishment of water and fertilizers, especially the application of organic fertilizers, in order to prevent the decline of soil fertility. Otherwise, the relatively poor agricultural soils in China's arid and semi-arid regions may become more barren, which is not conducive to the cultivation of farmland soils and the sustainable development of agricultural production.
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