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 variationF test

Additional treatments ** **
Pb rate NS NS
Time of application NS NS
Pb rate × time of application NS NS
Sewage sludge × additional treatments ** *
CV (%)11.9716.16

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.