Soil Moisture Analyzer Analysis of Suitable Soil Moisture of Capsicum Seedlings
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Moderate deficits in crop soil moisture can increase crop yields and water use efficiency. In the Loess Plateau region, insufficient effective soil water supply, low soil fertility and severe soil erosion have long plagued agricultural development in the region. The efficient use of limited water resources, the optimization of fertilization for plants, and the implementation of high-yielding and water-saving agriculture are The main objective of agricultural development in the area.
The soil used for the experiment was a plowed sandy loam soil of nearby farmland, which was air-dried and sieved. The soil bulk density was 1.49g#. A: 3, field capacity is 18%. Weigh 10kg of air-dried soil, add 10g of compound fertilizer and appropriate amount of bactericidal medicine to it, mix it and put it into the basin. The test subject was 2166 lines of pepper, which is a major pepper variety grown on the Loess Plateau. It has a short plant type and strong drought resistance. Combining local experience in planting peppers, the trial was conducted at the beginning of March and transplanted on May 20. The line of pepper seedlings was grown uniformly. Three plants were planted at one hole per pot, and irrigation was conducted to ensure the survival of line peppers. The same, so that the early water content is the same. Water treatment began on June 12, and the water control experiment at the seedling stage ended on July 6 (flowering at each treatment). Watering at the whole growth period ended on September 15. The minimum water content of the soil moisture at the seedling stage was 70%, 60%, 55%, 50%, 45% and 40% of the field water holding capacity, respectively, for a total of 6 treatments. The upper limit of irrigation was 80% of the field water holding capacity. Other fertility The upper and lower limits of soil moisture were controlled at 55% and 80% of field capacity, respectively. When each treated soil moisture content falls to the lower limit of water control, irrigation is performed to make the water content reach 80% of the field water holding capacity. Except during the seedling stage, soil moisture content in other growing seasons is reduced to 55% of the field water holding capacity. That is, irrigation begins at the upper limit.
According to the summary of soil moisture measurement, there is a reasonable combination of the synergistic effect between the upper limit of irrigation and the lower limit of soil moisture: the upper limit of irrigation is 62%-84.1%, and the lower limit of soil moisture is 40%-49% (all represent the equivalent of field water capacity). percentage). In this combined area, the upper limit of irrigation and the lower limit of soil moisture have mutually compensating effects. That is to say, the reduction of either of the upper limit of irrigation and the lower limit of soil moisture can be compensated by increasing the level of another factor to obtain the same yield.