Effects of Wote Super Absorbent and PAM absorbent on soil moisture and growth of potato

Compared with no used Wote super absorbent and PAM in loess hilly and gully regions of northern Shaanxi, applying Wote super absorbent and PAM in small holes near seed potato and soaking seed potato with 1.0% Wote super absorbent and 1.0% PAM, the effects of Wote and PAM on soil moisture and growth of potato were researched. The results showed: soil moisture in 10～20 cm and 30～40 cm deep soil of all treatments were slightly higher than that in CK betore floressence of potato, and were slightly lower than that in CK after stem and leaves witherd. In seedling phase, soil moisture in 0～100 cm deep soil of all treatments was slightly higher than that in CK. In florescence, soil moistures in 0～100 cm soil depth of Wote15, Wote30, PAM15 and PAM30 were super significantly(p＜0.01) higher than those in CK, and Wote60, Wote1.0%, PAM45, PAM60, PAM1.0% were significantly(p＜0.05) lower than that in CK. In harvest phase, soil moisture in 0～100 cm deep soil of all treatments was lower than that in CK. In florescence and harvest phase, with amounts of Wote and PAM, biomass, tuber yields, biggest tuber increased, tuber number decreased. From seeding to florescence phase, water consumptions of potato of Wote15, Wote30, PAM15 and PAM30 were significantly lower than that in CK. From seeding to harvest phase, water consumption of potato of all treatments had no difference with that in CK. In florescence and harvest phase, water use efficiency and water output rate of Wote and PAM treatments were super significantly higher than that in CK. In potato production, optimum amounts of applying Wote and PAM in small holes near the seed potato should be from 30 kg/hm² to 45 kg/hm². Soaking the seed potato with 1.0% Wote and 1.0%PAM should become a chiefly used way in planting potato.