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• Using Tobit Regression Model to Determine Safety Limit of Lead (Pb) in Irrigation Water for Lettuce Grown onEutric Fluvisols in Red River Delta

  Nguyen Thi Giang, Nguyen Van Dung, Nguyen Thi Hang Nga

  Date Received: 15-03-2023 / Date Accepted: 24-05-2023

   Abstract PDF (VIETNAMESE)

  The study was conducted to determine the safety limit of irrigation water contaminated with Pb for lettuce (Lactuca sativa L.) cv. Rapido 344 grown on Eutric Fluvisols. In pot experiments in net house were carried our with six levelsof Pb-contaminated water (0.0; 0.1; 0.5; 1.0; 2.0. and 4.0 mg/l) used for irrigation. The results showed that Pb-contaminated water increased Pb concentration in the lettuce from 0.19 mg/kg to 1.43 mg/kg and in the soil from 2.63-4.97 mg/kg compared to irrigation withPb non-contaminated water. With Tobit regression model, the safety limit of Pb in irrigation water less than 0.90 ppm was estimated with the mobile Pb form content in soil less than 7 mg/kg.