Investigating the Effect of Zeolite and DTPA on Tomato Production Characteristics in Pb-Contaminated Soils

In order to investgate the effects of zeolite and DTPA on reproductive traits of tomato in soil contaminated with lead a factorial experiment in a completely randomized design with three replications in Masjed Soleyman city was conducted in 2015. Factors studied consisted the concentration of lead in four levels of zero, 50, 100 and 150 mg per kg of soil, zeolite in three levels of zero,0.5 and 1% and DTPA in three levels of zero, 50 and 100 mg per kg of soil. The effects of lead concentrations, the use of zeolite and DTPA significantly affected the length of inflorescence, number of inflorescences per plant, number of flowers per inflorescence and the number of fruits per plant. Also, the effect of lead concentration and interaction of zeolite and DTPA significantly affect fresh and dry weight of fruit. Spike length, number of inflorescences per plant, number of fruits per plant and fruit dry weight reduced about 60, 42, 34 and 49%, respectively by increasing the lead concentration in the soil compared with control. However, the use of zeolite and DTPA caused a significant increase in measured traits. Also, the use of higher concentrations of zeolite along with higher levels of DTPA increased fresh and dry weight of tomato fruits.