Table 5: Phosphorus and Mg contents in peanut shoot as a function of Pb rates applied to soil with sewage sludge, time of sewage sludge application, mineral fertilization, and control.

Nutrient content (g kg−1) Treatment P Mg Additional treatments  Control 0.8a† 4.1a  Mineral fertilization 1.7a 2.3b Sewage sludge  Pb rate (mg kg−1)  3 1.8a 3.1a  21 1.9a 3.1a  42 1.8a 3.0a Time of application  30 d before sowing 1.9a 2.8a  At the day of sowing 1.8a 3.3a Analysis of variance Source of variation F test‡ Additional treatments ** ** Pb rate NS NS Time of application NS NS Pb rate × time of application NS NS Sewage sludge × additional treatments ** * CV (%) 11.97 16.16

†Means followed by same letter in column within additional treatments and each factor of factorial do not differ significantly by Tukey test at P < 0.05. ‡NS: not significant. *, **significant at P < 0.05 and P < 0.01, respectively.