The relationship between crops and moisture is extremely close. Soil water potential has a significant impact on the growth and yield of crops. In order to study the relationship between them and explore the feasibility of applying water potential as a crop irrigation indicator, we conducted a pilot study on rape as a tested crop. The plant water potential stress chamber investigates the relationship between soil moisture and plant water content, improving efficiency for irrigation.
The experiment was conducted using potted plants. The test soil was light loam soil. The test was to set high, medium, and low soil water potential values, and three replicates were set for each treatment. The soil water potential of each treatment period (excavation), and the corresponding soil moisture content and percentage of the field water holding rate.
The leaf water potential of rape has a tendency to decrease with decreasing soil water potential, but the decreased ratio gradually decreases with the decrease of soil water potential, that is, the reduction of leaf water potential has a hysteresis effect. The test results for n tests: When the soil water potential is 277 hPa, the corresponding leaf water potential value is a 6622 hPa, which is equivalent to 24 times the soil water potential value; when the soil water potential value is reduced to a 451 hPa and a 640 hPa, the corresponding leaf The water potential values ​​are 7609 hpa and 8476 hPa, which are only equivalent to 17 times and 13 times the soil water potential value, respectively.
Through the analysis of the plant water potential pressure chamber, the effect of soil water potential on the leaf water potential can be reflected from the changes in the morning and afternoon potential values. Five sunny days were selected during the mossy flowering period of rape, and three treated soil water potentials and corresponding leaf water potentials were observed at 10 h and 4 h respectively. From the measurement results, it can be seen that the soil water potential values ​​of the three treatments are significantly reduced from morning to afternoon, and the corresponding leaf water potential values ​​also show a significant downward trend. The decline in water potential of the three treatments of rapeseed was 8.6, 9.9, and 8.8 times the decrease in soil water potential, respectively. There is little difference in the multiple of the drop value. This also clearly shows that the leaf water potential of rapeseed is obviously constrained by the soil water potential, and there is a clear correlation between the two.
The experiment was conducted using potted plants. The test soil was light loam soil. The test was to set high, medium, and low soil water potential values, and three replicates were set for each treatment. The soil water potential of each treatment period (excavation), and the corresponding soil moisture content and percentage of the field water holding rate.
The leaf water potential of rape has a tendency to decrease with decreasing soil water potential, but the decreased ratio gradually decreases with the decrease of soil water potential, that is, the reduction of leaf water potential has a hysteresis effect. The test results for n tests: When the soil water potential is 277 hPa, the corresponding leaf water potential value is a 6622 hPa, which is equivalent to 24 times the soil water potential value; when the soil water potential value is reduced to a 451 hPa and a 640 hPa, the corresponding leaf The water potential values ​​are 7609 hpa and 8476 hPa, which are only equivalent to 17 times and 13 times the soil water potential value, respectively.
Through the analysis of the plant water potential pressure chamber, the effect of soil water potential on the leaf water potential can be reflected from the changes in the morning and afternoon potential values. Five sunny days were selected during the mossy flowering period of rape, and three treated soil water potentials and corresponding leaf water potentials were observed at 10 h and 4 h respectively. From the measurement results, it can be seen that the soil water potential values ​​of the three treatments are significantly reduced from morning to afternoon, and the corresponding leaf water potential values ​​also show a significant downward trend. The decline in water potential of the three treatments of rapeseed was 8.6, 9.9, and 8.8 times the decrease in soil water potential, respectively. There is little difference in the multiple of the drop value. This also clearly shows that the leaf water potential of rapeseed is obviously constrained by the soil water potential, and there is a clear correlation between the two.
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