New approaches to the effects of Si on sugarcane ratoon under irrigation in Quartzipsamments, Eutrophic Red Oxisol, and Dystrophic Red Oxisol

Table 3 Chemical characteristics of Quartzipsamments (NQ), Eutroferric Red Oxisols (LVe) and Dystrophic Red Oxisols (LVd)

Soil	pH	OM	P	S	K	Ca	Mg	Al	H + Al	CEC	V	m	Si	clay	silt	sand
Soil	CaCl₂	g dm⁻³	mg dm⁻³		––––– mmolc dm⁻³ –––––						%		mg kg⁻¹	g kg⁻¹
NQ	4.3	9	2	6	0.3	3	1	0	16	20.0	21	0	1	50	10	940
Lve	6.2	8	8	8	1.0	16	5	0	17	38.6	57	0	5	550	240	210
LVd	5.2	9	20	7	1.2	14	6	0	22	44.2	49	0	3	300	40	660

CEC Cation exchange capacity, V base saturation, m aluminum saturation, pH CaCl₂ by potentiometry, H + Al SMP buffer by potentiometry, O.M. organic matter by spectrophotometry, P in resin by spectrophotometry, S by turbidimetry, K Ca and Mg atomic absorption spectrometry, Si 0.01 M calcium chloride

ISSN: 1471-2229