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

Table 2 C, N, P, and Si content in leaves and stem 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 (mg per plant)
Presence	without	7013.7 Bb	1772.8 Bb	3783.3 Bb	514.4 Bb	8339.7 Bb	1850.2 Bb
Presence	with	9722.6 Ba	2669.5 Ba	4431.1 Ba	1129.2 Ba	8909.7 Ba	2125.1 Ba
Absence	without	12,234.0 Aa	4577.5 Aa	5522.8 Ab	1571.7 Aa	11,377.0 Aa	3520.7 Ab
Absence	with	12,443.0 Aa	5099.8 Aa	6644.0 Aa	1906.2 Aa	11,642.0 Aa	3865.6 Aa
N (mg per plant)
Presence	without	69.87 Bb	15.72 Bb	77.14 Aa	6.24 Bb	122.66 Ba	17.72 Ba
Presence	with	87.96 Ba	20.56 Ba	77.25 Aa	12.19 Aa	126.36 Ba	19.61 Ba
Absence	without	122.52 Aa	31.56 Aa	55.44 Ba	11.29 Aa	171.65 Aa	29.05 Aa
Absence	with	119.00 Aa	30.31 Aa	63.82 Ba	11.70 Aa	161.20 Ab	23.89 Aa
P (mg per plant)
Presence	without	8.78 Bb	2.59 Bb	2.00 Bb	0.49 Bb	13.17 Bb	4.33 Bb
Presence	with	15.05 Ba	4.07 Ba	2.59 Ba	1.31 Ba	14.79 Ba	6.27 Ba
Absence	without	17.44 Ab	7.49 Aa	4.19 Ab	1.68 Ab	19.37 Ab	10.01 Ab
Absence	with	19.28 Aa	8.91 Aa	6.07 Aa	2.51 Aa	23.34 Aa	13.26 Aa
Si (mg per plant)
Presence	without	50.81 Bb	8.76 Bb	31.44 Bb	4.67 Bb	67.20 Bb	10.37 Bb
Presence	with	242.51 Ba	24.87 Ba	95.53 Ba	12.43 Ba	168.06 Ba	28.58 Ba
Absence	without	96.79 Ab	28.60 Ab	66.94 Ab	21.55 Ab	144.02 Ab	26.93 Ab
Absence	with	534.00 Aa	94.40 Aa	299.06 Aa	63.01 Aa	346.45 Aa	79.48 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