It can be seen from Table 1 that there is no direct correlation between water use and zinc concentration in each zinc treatment group. However, at the same zinc treatment concentration, with the extension of zinc treatment time, the water use degree decreased gradually. Compared with that of 7 days, the water use degree of 14 days treatment decreased significantly. However, compared with the water use degree of 14 days, the water use degree of 21 days decreased slightly.

Table 1