Effects of Hydrogel Use in <i>Cariniana pyriformis</i> (Lecythidaceae) Seedlings Under Different Water Regimes

Ríos, Ingrid Vanessa; Prato, Andrés Iván; Castaño, Andrés Felipe

doi:10.1590/2179-8087-FLORAM-2020-0009

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ORIGINAL ARTICLE, Silviculture • Floresta Ambient. 28 (2) • 2021 • https://doi.org/10.1590/2179-8087-FLORAM-2020-0009 copy

Effects of Hydrogel Use in Cariniana pyriformis (Lecythidaceae) Seedlings Under Different Water Regimes

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The effect of hydrogel (0, 3, 6, and 9 g per seedling) on the survival and growth of Cariniana pyriformis seedlings under different water regimes (absence of irrigation, 60% and 100% field capacity) in a sandy loam soil was assessed. The experiment was carried out in an agricultural nursery with drip irrigation, implementing a completely randomized block design in a split-plot scheme. After 20 weeks of evaluation in both treatments with irrigation, the maximum dose showed a slight increase (9%) in stem diameter and seedling height compared with the control treatment, although the aerial and root dry biomass did not show differences. For the treatment without irrigation, the survival had a linear response with increasing doses, from 24% (0 g per seedling) to 65% (9 g per seedling). C. pyriformis responds positively to hydrogel when a severe water deficit occurs.

Keywords:
Colombian mahogany; hydro retainer polymer; reforestation; water stress

Physical properties			Chemical properties
soil texture ⁽¹⁾	sandy loam		pH ⁽⁵⁾		6.7
sand	(%)	67.4	E.C ⁽⁵⁾	dS m^-1	0.16
Silt		14.2	O.M ⁽⁶⁾	g 100 g^-1	0.72
Clay		18.4	N ⁽⁷⁾	%	0.11
bulk density ⁽²⁾	g cm^-3	1.2	P ⁽⁸⁾	mg kg^-1	9.6
real density	g cm^-3	2.6	S ⁽⁹⁾		3.6
WRC (curve tension kPa)			Fe ⁽⁹⁾		29.8
0	%	42.5	Ca^{+2 (10)}	cmol ₍₊₎ kg^-1	5.1
-10 ⁽³⁾		18.0	Mg^{+2 (10)}		0.7
-33		13.8	K^{+ (10)}		0.1
-1,500 ⁽⁴⁾		6.5	Na ⁽¹⁰⁾		0.14

Stage		Visual characteristics
0	Normal	No signs of wilting or water stress.
1	Slightly wilted	Some leaves lose turgidity, but none are rolled or folded.
2	Wilted	Leaves begin to hang and have lost turgidity. The leaf angle is close to -45° in relation to the horizontal plane.
3	Severely wilted	Beginning of the generalized leaf necrosis (with gray-green to gray-brown areas).
4	Nearly dead	Most of the leaves are necrotic, some young leaves still green near the midrib. The stem is alive and is distinguished by its color and elasticity.
5	Dead	Necrosis of all leaves and the stem has lost its elasticity.

Water regime	DRM (g seedling^-1) ^(A)	DMA (g seedling^-1) ^(B)	DQI ^(B)
No irrigation	2.85±0.40 b	4.7±0.29 b	2.26±0.21 b
60% FC	5.26±0.93 a	17.5±4.20 a	6.32±1.25 a
100% FC	5.73±0.87 a	17.6±3.74 a	5.2±0.82 a
CV (%)	33.5	55.9	45.7

Hydrogel (g seedling^-1)	Category (days)
Hydrogel (g seedling^-1)	0 ^ns	1	2 ^ns	3 ^ns	4 ^ns	5
0	39.1±1.4	16.2±6.8 b	37.7±3.7	16.3±1.6	12.1±2.1	14.0±3.2 a
3	46.1±2.9	21.5±2.3 b	34.9±5.9	14.0±2.4	10.3±2.9	10.7±3 a
6	41.1±4.5	28.9±1.8 a	28.3±6.8	16.3±1.6	13.1±3.5	9.3±3.6 ab
9	47.6±0.8	23.4±4.0 b	38.7±5.3	12.6±2.8	12.1±3.5	3.7±3.3 b
CV (%)	7.8	16.6	15.1	12.6	12.0	39.3

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E-mail: floram@ufrrj.br

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[1] CORRESPONDENCE TOAndrés Iván Prato Corporación Colombiana de Investigación Agropecuaria (AGROSAVIA), Centro de Investigación La Suiza, Km 32 via al mar, CEP 687519, Rionegro, Santander, Colombia e-mail: aprato@agrosavia.co