Nutritional status and biomass of african mahogany seedlings grown with nutrient solution in the Northern Amazon

Smiderle, Oscar José; Souza, Aline das Graças; Chagas, Edvan Alves; Alves, Marcia Souza; Fagundes, Paulo Renato de Oliveira

doi:10.5902/1980509819904

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Artigos • Ciênc. Florest. 30 (4) • Oct-Dec 2020 • https://doi.org/10.5902/1980509819904 copy

Nutritional status and biomass of african mahogany seedlings grown with nutrient solution in the Northern Amazon^* * Trabalho extraído da Tese do quinto Autor a ser apresentada no Programa de Pós-Graduação em Agronomia, Universidade Federal de Roraima.

Status nutricional e biomassa de mudas de mogno africano cultivadas com solução nutritiva na Amazônia Setentrional

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this work was to determine aspects about growth variables and dry mass partition of Khaya senegalensis seedlings and the nutrient absorption rate, depending on the seasons and mineral fertilization. The experimental design used was completely randomized, in a 2x6 factorial scheme. Two levels of nutrient solution factor (without addition) and six levels of time factor (0; 60; 80; 100; 120 and 140 days). Four replications were used, each one consisting of 10 seedlings. To evaluate the quality of the seedlings, morphological parameters, relationships and quality indexes were considered: Height (H; cm); collar diameter (CD; mm); shoot dry mass (SDM; g plant^-1); dry root mass (DRM; g plant^-1); total dry mass (TDM = SDW + RDW; g plant^-1); shoot dry mass and root dry mass ratio (SDM/DRM); robustness index (RI = H / DC; cm mm ^-1); the Dickson quality index (DQI) and the accumulation of macronutrients in the shoots and root system. It is recommended to add solution for seedlings of Khaya senegalensis from 100 days after transplanting in the selected nursery in the Amazon. The maintenance of Khaya senegalensis seedlings with the use of the nutrient solution provides the best conditions for the use of macronutrients and obtaining suitable seedlings for the field in 140 days after transplanting in the selected nursery in Roraima.

Keywords:
Khaya senegalensis; Seedling production; Mineral nutrition

Table 1: Chemical composition, micronutrients and granulometryof the substrate (OrganoAmazon®) used in the growth of Khaya senegalensis

Sub⁽¹⁾	pH	Assortment complex⁽²⁾								V	M	P	MO
Sub⁽¹⁾	pH	Ca²⁺	Mg²⁺	K⁺	Al³⁺	H+Al	S	t	T	V	M	P	MO
			-------cmol_cdm^-3-------							---% ---		mg dm^-3	g kg^-1
ORG	5.8	10.5	7.9	1.6	-	2.1	20	20	22	90.6	-	176.7	69.2
Sub		Micronutrients⁽³⁾									Granulometry
Sub		Zn	Fe	Mn	Cu	B	S				Clay	Silt	Sand
ORG		-------mg dm^-3-------									-------g kg^-1-------
ORG		19.5	27.1	124	0.3	0.3	19.0				170	290	540

Table 2: Composition of the nutrient solution used in the production of Khaya senegalensis seedlings

Composition	N-NO₃-	N-NH₄+	P	K	Ca	Mg	S	Fe	EC	(Ions)	Ionic force
	mg L^-1								Ds m^-1	mmol L^-1
Nutritive solution	174.0	24.0	39.0	183.0	142.0	38.0	52.0	32.0	1.7	26.9	21.9

Table 3: Height; collar diameter; shoot dry weight; root-system dry weight; total dry weight; robustness index; shoot dry weight and root-system dry weight the Dickson quality index, of seedlings of Khaya senegalensis without (WS) and with application of nutrient solution (NS) depending on the different seasons evaluated

	H (cm)				CD (mm)				SDM (g plant^-1)				DRM (g plant^-1)
Times	WS		NS		WS		NS		WS		NS		WS		NS
0	7.36	fA	7.69	fA	3.36	fA	3.41	fA	0.30	fA	0.30	fA	0.27	fA	0.29	fA
60	24.01	eB	24.94	eA	6.72	eA	6.19	eB	3.84	eA	3.86	eA	1.15	eA	0.99	eB
80	32.01	dB	33.56	dA	8.59	dB	9.44	dA	9.30	dB	10.04	dA	1.96	dB	2.84	dA
100	44.63	cB	46.10	cA	9.98	cB	12.54	cA	13.98	cB	15.44	cA	4.27	cB	4.86	cA
120	47.58	bB	64.88	bA	11.12	bB	14.68	bA	21.91	bB	35.66	bA	5.76	bB	8.64	bA
140	75.47	aB	91.75	aA	13.07	aB	17.12	aA	27.78	aB	52.31	aA	5.83	aB	12.56	aA
Average	38.51	B	44.82	A	8.81	B	10.56	A	12.85	B	19.60	A	3.20	B	5.03	A
CV%	1.33				2.01				0.37				0.79
	TDM (g plant^-1)				RI (cm mm^-1)				SDM/DRM (gplant^-1)				DQI Index
	WS		NS		WS		NS		WS		NS		WS		NS
0	0.57	fA	0.59	fA	2.19	dA	2.25	eA	1.13	dA	1.05	eB	0.17	fA	0.18		fA
60	4.99	eA	4.85	eB	3.58	cB	4.03	cA	3.35	cB	3.91	dA	0.72	eA	0.61	eB
80	11.25	dB	12.88	dA	3.73	cA	3.55	dB	4.76	cA	3.53	cB	1.33	dB	1.82	dA
100	18.25	cB	20.30	cA	4.47	bA	3.68	dB	3.28	bA	3.17	bB	2.35	cB	2.96	cA
120	27.67	bB	44.30	bA	4.28	bA	4.42	bA	3.80	aB	4.13	aA	3.42	bB	5.18	bA
140	33.61	aB	64.87	aA	5.77	aA	5.36	aB	4.76	aA	4.17	aB	3.19	aB	6.81	aA
Average	16.06	B	24.63	A	4.00	A	3.88	B	3.51	A	3.33	B	1.86	B	2.93	A
CV%	0.36				2.66				1.34				1.92

Universidade Federal de Santa Maria Av. Roraima, 1.000, 97105-900 Santa Maria RS Brasil, Tel. : (55 55)3220-8444 r.37, Fax: (55 55)3220-8444 r.22 - Santa Maria - RS - Brazil
E-mail: cienciaflorestal@ufsm.br

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Trabalho extraído da Tese do quinto Autor a ser apresentada no Programa de Pós-Graduação em Agronomia, Universidade Federal de Roraima.

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Nutritional status and biomass of african mahogany seedlings grown with nutrient solution in the Northern Amazon* * Trabalho extraído da Tese do quinto Autor a ser apresentada no Programa de Pós-Graduação em Agronomia, Universidade Federal de Roraima.

Status nutricional e biomassa de mudas de mogno africano cultivadas com solução nutritiva na Amazônia Setentrional

Abstract

Nutritional status and biomass of african mahogany seedlings grown with nutrient solution in the Northern Amazon^* * Trabalho extraído da Tese do quinto Autor a ser apresentada no Programa de Pós-Graduação em Agronomia, Universidade Federal de Roraima.