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

Table 1 C, N, P, and Si concentrations in leaves and stems of sugarcane plants in two water deficit conditions (presence: 35%, and absence: 70% of water retention) combined with absence (0.0 mmol L⁻¹) and presence of fertigated Si (1.8 mmol L⁻¹) in three tropical soils (Quartzarenic Neosol; Eutroferric Red Latosol; and Dystrophic Red Latosol)

Water deficit	Si	Quartzipsamments		Eutrophic Red Oxisols		Dystrophic Red Oxisols
Water deficit	Si	leaf	Stem	leaf	stem	leaf	stem
C (g kg⁻¹)
Presence	without	437.27 Aa	413.52 Aa	437.35 Aa	425.81 Aa	428.55 Aa	422.71 Aa
Presence	with	422.63 Ab	408.22 Aa	433.72 Aa	413.88 Ab	426.70 Aa	416.62 Ab
Absence	without	430.78 Aa	416.71 Aa	417.14 Ba	413.31 Ba	432.04 Aa	416.20 Ba
Absence	with	417.98 Ab	406.6 Ab	416.77 Ba	414.39 Aa	419.92 Bb	411.59 Bb
N (g kg⁻¹)
Presence	without	4.37 Aa	3.67 Aa	8.89 Aa	5.17 Aa	6.25 Ba	4.22 Aa
Presence	with	3.53 Bb	3.15 Ab	7.76 Ab	4.47 Ab	6.01 Aa	3.84 Aa
Absence	without	4.50 Aa	2.87 Ba	4.80 Ba	3.06 Ba	6.93 Aa	3.10 Ba
Absence	with	4.05 Ab	2.48 Bb	4.26 Bb	2.53 Bb	5.33 Bb	2.52 Bb
P (g kg⁻¹)
Presence	Without	0.55 Bb	0.58 Bb	0.23 Bb	0.41 Bb	0.68 Bb	0.99 Bb
Presence	With	0.63 Aa	0.62 Ba	0.27 Ba	0.48 Ba	0.71 Ba	1.12 Ba
Absence	Without	0.61 Aa	0.68 Ab	0.33 Ab	0.48 Ab	0.75 Ab	1.15 Ab
Absence	with	0.64 Aa	0.71 Aa	0.38 Aa	0.54 Aa	0.85 Aa	1.42 Aa
Si (g kg⁻¹)
Presence	Without	2.81 Ab	1.97 Ab	3.64 Bb	3.13 Bb	3.44 Bb	2.36 Ab
Presence	With	10.00 Ba	4.19 Ba	9.18 Ba	4.77 Ba	8.06 Ba	5.64 Ba
Absence	Without	3.41 Ab	2.41 Ab	5.55 Ab	5.66 Ab	4.85 Ab	3.41 Ab
Absence	With	17.91 Aa	7.53 Aa	19.42 Aa	13.63 Aa	12.67 Aa	8.39 Aa

Different uppercase letters indicate differences in water deficit and different lowercase letters indicate differences in Si fertigation by Tukey test (p < 0.05)

ISSN: 1471-2229