Water is a key factor for crop growth. The relationship between crops and water is extremely close. The level of soil water potential has a significant impact on the growth and yield of crops. In order to study the relationship between them, it is feasible to explore the application of water potential as an index of crop irrigation. Sex, we conducted experiments on rapeseed as a test crop. The plant water potential pressure chamber is an important instrument for the study of plant water potential.

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 (excuse soil), and the corresponding soil moisture content (mouth 2%) and the percentage of field water retention.

According to the comparative analysis of the n times measured data of the water potential of rapeseed leaves treated with three kinds of soil water potential during the experiment and the corresponding soil water potential value, it shows that the leaf water potential of rape has a tendency to decrease with the decrease of soil water potential, but the decreased ratio follows the soil water potential. The decrease and gradual decrease of the leaf water potential has a hysteresis effect. The influence of soil water potential on leaf water potential can also 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, while the corresponding leaf water potential values ​​measured by the plant water potential pressure chambers 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 plant water potential stress chamber test results show that: a. It is feasible to use a tensiometer as a test method to monitor the change of soil water potential; b. The higher soil water potential value has a significant role in promoting the vegetative growth and reproductive growth of rape; c. According to the water demand characteristics of rapeseed, the suitable soil water potential should be maintained between 150-1350 hPa.

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