Biomass and Yield of Peanut Grown on Tropical Soil Amended with Sewage Sludge Contaminated with Lead

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.