Effects of planting hole sealing methods on soil moisture, temperature, salinity and survival rate of tomato seedling

In order to improving tomato transplanting survival rate in saline and alkaline land in Hetao irrigation area, Inner Mongolia, taking the planting hole sealed by soil as control, soil moisture, temperature, salinity between plants and rhizosphere, and the growth of tomato seedling that the planting hole sealed by sand and planting hole with no seal were monitored. The result showed that soil moisture, temperature and salinity between plants of different treatments had no significant difference. Compared with the control, soil moisture of planting hole sealed by sand and planting hole no seal decreased by 11.73% and 14.80% in 0-10 cm soil depth, and decreased by 9.60% and 13.64% respectively in ≥10-20 cm soil depth; soil maximum temperature decreased by 1.2 and 3.6℃at 5 cm soil depth, and average daily temperature decreased by 1.6 and 2.2℃ respectively; soil salinity decreased by 19.11% and24.84% in 0-10 cm soil depth, and decreased by 11.84% and 19.67% compared to planting hole sealed by soil in ≥10-20 cm soil depth respectively. Tomato transplanting survival rate of planting hole sealed by sand and planting hole with no sealed increased by 20.57% and 19.4% compared to planting hole sealed by soil respectively. It was indicated that treatments of the planting hole sealed by sand or the planting hole with no seal at planting time when cultivating tomato in saline and alkaline land with mulching in Hetao irrigation area, Inner Mongolia, soil moisture and temperature in soil decreased, soil salt accumulation in soil hindered, tomato transplanting survival rate increased. This study provides guidance for saline-alkali soil planting tomato in Hetao irrigation area.