This study was conducted in the greenhouse (24 ± 2 C).
Thirty-day-old seedlings of tomato (cv. Sultana-7) were used,
one seedling per pot (15 cm diam.). The soil of each pot
(1500 g) was a mixture of sand, sandy loam and peat moss
(2:1:1), which was previously steam-sterilized (15 Psi at
121 C) with an autoclave for 30 min.