Applying Sewage Sludge to Eucalyptus grandis Plantations: Effects on Biomass Production and Nutrient Cycling through Litterfall

Table 3

Nutrients added in the treatments through the sewage sludge and mineral fertilizer application to the soil of the experimental forest stands.

Treatment	Age (days by implantation)	Input (per tree)	N	P	K	Ca	Mg	S	B	Zn
			kg ha^−1
(1) C (Control)		no fertilization	—	—	—	—	—	—	—	—
		TOTAL	—	—	—	—	—	—	—	—
(2) MF (Mineral fertilizer)	−45	1.2 kg dolomite*	—	—	—	440	160	—	—	—
	7	160 g NPK 6 : 30 : 6 + 2% S + 0.5% Zn	16	34	13	—	—	5	—	1.5
	90	70 g ammonium nitrate	39	—	—	—	—	—	—	—
	90	50 g potassium chloride	—	—	41	—	—	—	—	—
	90	8 g de Borax	—	—	—	—	—	—	1.5	—
	180	180 g NPK 20 : 0 : 20 + 0.5% B	60	—	50	—	—	—	1.5	—
		TOTAL	115	34	105	440	160	5	3	2
(3) WS (10 t ha^−1 wet sewage)	7	26 kg wet sewage	320	140	21	248	48	66	0.1	24
	7	16 g potassium chloride	—	—	13	—	—	—	—	—
	90	50 g potassium chloride	—	—	41	—	—	—	—	—
	90	15 g de Borax	—	—	—	—	—	—	2.9	—
	180	34 g potassium chloride	—	—	28	—	—	—	—	—
		TOTAL	320	140	105	248	48	66	3	24
(4) DS (10 t ha^−1 dry sewage)	7	6 kg dry sewage	322	154	21	228	36	63	0.1	32
	7	16 g potassium chloride	—	—	13	—	—	—	—	—
	90	50 g potassium chloride	—	—	41	—	—	—	—	—
	90	15 g de Borax	—	—	—	—	—	—	2.9	—
	180	35 g potassium chloride	—	—	29	—	—	—	—	—
		TOTAL	322	154	105	228	36	63	3	24

*Dolomite was broadcast on the soil surface 45 days before planting.