SHADING LEVELS AND PLANT GROWTH REGULATOR FOR FORMATION OF <i>SCHIZOLOBIUM AMAZONICUM</i> COMPACT SEEDLINGS

Binotti, Eliana D. C.; Binotti, Flávio F. da S.; Lucheti, Bruna Z.; Costa, Edilson; Pinto, Adriana H.

doi:10.1590/1809-4430-Eng.Agric.v39n5p586-591/2019

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Scientific Paper, Soil and Water Engineering • Eng. agríc. (Online) 39 (5) • Sep-Oct 2019 • https://doi.org/10.1590/1809-4430-Eng.Agric.v39n5p586-591/2019 copy

SHADING LEVELS AND PLANT GROWTH REGULATOR FOR FORMATION OF SCHIZOLOBIUM AMAZONICUM COMPACT SEEDLINGS

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Paricá (Schizolobium amazonicum) can be used for rehabilitation of degraded lands, timber manufacturing markets. However, for its planting, high-quality seedlings should be used. Thus, this study aimed to evaluate the effect of different types of paclobutrazol (PBZ) application and two shading levels on high-quality seedling production. As there was no replication of cultivation environments, we considered each one of them as an experiment. For each environment (35 and 50% shading screen), a completely randomized design was adopted, testing combinations of two types of PBZ application (direct seed immersion in 0.005% PBZ solution; substrate hydration with 0.005% PBZ solution; and 50% seed hydration and 50% substrate hydration; plus, a control), with five replications and five seedlings per plot. The environments were evaluated by analysis of groups of experiments. Seedling growth was evaluated. Under 50% shading, Paricá seedlings had better growth conditions. Application of 100% PBZ in substrate provided compact seedlings with larger dry root phytomass, besides being more practical.

KEYWORDS
protected cultivation; plant environment; high-quality seedlings; plant growth reducer; Schizolobium amazonicum

pH	–––––––––– cmol dm^-3 ––––––			mg dm^-3	cmolc.	g dm^-3
CaCl2	Ca	Mg	Al	P (Mel)	CEC	OM	OC
4.8	4.3	1.1	0.19	7.4	12.5	23.9	13.9
mg dm^-3(ppm)			–––––––––– mg dm^-3(ppm). Mehlich^-1–––––––––––			%
S	B	Cu	Fe	Mn	Zn	Na	BS
3.7	0.13	2.0	26	78.6	1.5	Ns	78.6

Treatment	Seedling height –––cm–––	Seedling diameter –––mm––	H/CD
Environment
35% shading	24.22 b	4.22 b	5.75 a
50% shading	26.32 a	4.53 a	5.78 a
PBZ application method
Control	31.04 a	4.64 a	6.73 a
100% seed (Se)	27.20 b	4.64 a	5.89 b
100% substrate (S)	21.39 c	4.02 b	5.33 bc
50% Se + 50% S	21.43 c	4.20 b	5.10 c
CV%	9.27	8.05	10.23

PBZ application method	Growing environment
PBZ application method	35% shading	50% shading
	Root dry phytomass (g seedling^-1)
Control	0.407 A b	0,520 A a
100% via seeds	0.544 A ab	0,586 A a
100% via substrate	0.667 A a	0,553 A a
50% via seeds + 50% via substrate	0.612 A a	0,562 A a
CV%	16.28
	Shoot dry phytomass (g seedling^-1)
Control	0.853 B a	1.246 A a
100% via seeds	0.706 B a	1.297 A a
100% via substrate	0.607 A a	0.706 A b
50% via seeds + 50% via substrate	0.581 A a	0.639 A b
CV%	28.99
	Total dry phytomass (g seedling^-1)
Control	1.261 B a	1,766 A a
100% via seeds	1.250 B a	1,883 A a
100% via substrate	1.275 A a	1,179 A b
50% via seeds + 50% via substrate	1.194 A a	1,202 A b
CV%	21.16

Associação Brasileira de Engenharia Agrícola SBEA - Associação Brasileira de Engenharia Agrícola, Departamento de Engenharia e Ciências Exatas FCAV/UNESP, Prof. Paulo Donato Castellane, km 5, 14884.900 | Jaboticabal - SP, Tel./Fax: +55 16 3209 7619 - Jaboticabal - SP - Brazil
E-mail: revistasbea@sbea.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] * Corresponding author. Universidade Estadual de Mato Grosso do Sul/ Cassilândia - MS, Brasil. E-mail: dclia78@yahoo.com.br