SALT STRESS AND AMBIENCE ON THE PRODUCTION OF WATERMELON SEEDLINGS

SILVA JUNIOR, FRANCISCO BARROSO DA; SOUSA, GEOCLEBER GOMES DE; SOUSA, JOSÉ THOMAS MACHADO DE; LESSA, CARLA INGRYD NOJOSA; SILVA, FRED DENILSON BARBOSA DA

doi:10.1590/1983-21252020v33n224rc

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Agricultural Engineering • Rev. Caatinga 33 (2) • Apr-Jun 2020 • https://doi.org/10.1590/1983-21252020v33n224rc copy

SALT STRESS AND AMBIENCE ON THE PRODUCTION OF WATERMELON SEEDLINGS

ESTRESSE SALINO E AMBIÊNCIA NA PRODUÇÃO DE MUDAS DE MELANCIA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The objective of this study was to evaluate the production of watermelon seedlings irrigated with saline waters and cultivated in different types of environments and substrates. The experimental design was completely randomized with split-split plots, in which the plot corresponded to two growing environments (EN1 = full sun and EN2 = 50% shade black net), the subplot to two types of irrigation water (IW1 = 0.8 and IW2 = 2.5 dS m^-1) and the sub-subplot to four types of substrates (SB1 = vermiculite + coconut fiber, SB2 = manure + soil, SB3 = carbonized rice husk + soil, SB4 = biochar + soil), with four replicates of twenty-five seeds. The variables analyzed were: emergence percentage (EP), emergence speed index (ESI), mean time of emergence (MTE), number of leaves (NL), stem diameter (SD), seedling height (SH) and root length (RL), shoot dry mass (SDM), root dry mass (RDM) and total dry mass (TDM). The EN2 treatment provided better conditions for emergence and initial growth, and EN1 was also favorable to the emergence and initial growth of watermelon seedlings, when the substrates SB1 and SB2 were used.

Keywords:
Citrullus lanatus (Thunb.) Matsum & Nakai; Protected environment; Salinity

Chemical characteristics
	OM	N	Ca²⁺	K⁺	Mg²⁺	Na⁺	H⁺ + Al³⁺	Al	SB	P	CEC	V
(gkg^-1)			(cmol_c kg^-1)							(mg kg^-1)		(%)
SB1	---	0.60	13	73.51	378.33	---	---	---	464.84	300	464.84	100
SB2	14.74	0.93	4.90	0.58	0.90	0.26	0.33	0.00	6.64	20	6.97	95
SB3	5.18	0.31	0.70	0.24	0.50	0.08	0.50	0.05	1.52	20	2.02	75
SB4	4.07	0.24	0.60	0.16	0.40	0.10	0.17	0.00	1.26	10	1.43	88

	Temperature (º C)	Umida
	Max.	Min.	Max.	Min.
Full sun	34.5	32.6	53	47
50% Shade black net	35.5	33.8	50	46.5

SV			Mean square
	DF	EP	ESI	MTE	MSE
Environment (EN)	1	1,600.00000^ Significant by the 1% F test, ns: not significant.	8.76900^ Significant by the 1% F test, ns: not significant.	14.72641^ Significant by the 1% F test, ns: not significant.	0.00473^ Significant by the 1% F test, ns: not significant.
Water (WA)	1	256.00000^ns	1.79895^ Significant by the 1% F test, ns: not significant.	5.16426^ Significant by the 1% F test, ns: not significant.	0.00214^ Significant by the 1% F test, ns: not significant.
Substrates (SB)	3	772.00000^ Significant by the 1% F test, ns: not significant.	3.37862^ Significant by the 1% F test, ns: not significant.	6.45212^ Significant by the 1% F test, ns: not significant.	0.00231^ Significant by the 1% F test, ns: not significant.
EN x WA	1	196.00000^ns	0.33785^ns	1.05063^* * Significant by the 5% F test,	0.00026^ns
EN x SB	3	1,004.00000^ns	3.89050^ Significant by the 1% F test, ns: not significant.	5.60009^ Significant by the 1% F test, ns: not significant.	0.00184^ Significant by the 1% F test, ns: not significant.
WA x SB	3	390.66667^* * Significant by the 5% F test,	0.25123^ns	0.17570^ns	0.00003^ns
EN x WA x SB	3	525.33333^ Significant by the 1% F test, ns: not significant.	0.80403^ Significant by the 1% F test, ns: not significant.	0.87635^ Significant by the 1% F test, ns: not significant.	0.00
Resíduo - EN	6	69.33333	0.09168	0.19856	0.00008
Resíduo - WA	6	92.66667	0.09181	0.13324	0.00008
Resíduo - SB	36	96.55556	0.14148	0.16357	0.00007
Total	63
Overall mean		89.5	3.50484	6.85313	0.14891
CV - EN (%)		9.3	8.64	6.5	5.88
CV - WA (%)		10.76	8.65	5.33	6.19
CV - SB (%)		10.98	10.73	5.9	5.43

SV	Meansquare
	DF	SH	RL	SD	NL	SDM	RDM	TDM
Environment (EN)	1	146.25^ Significant by the 1% F test, ns: not significant.	1.11^ns	0.14^ns	1.62^ns	319.73^ns	332.37^ns	1,304.11^ns
Water (WA)	1	6.84^ Significant by the 1% F test, ns: not significant.	0.03^ns	0.19^ns	0.05^ns	1,534.19^* * Significant by the 5% F test,	33.27^ns	2,019.37^ns
Substrates (SB)	3	6.79^ Significant by the 1% F test, ns: not significant.	2.20^* * Significant by the 5% F test,	0.43^ Significant by the 1% F test, ns: not significant.	0.26^ns	592.47^ Significant by the 1% F test, ns: not significant.	628.53^ns	377.38^ns
EN x WA	1	1.28^ Significant by the 1% F test, ns: not significant.	0.47^ns	0.54^ns	0.14^ns	16.15^ns	61.13^ns	140.12^ns
EN x SB	3	0.44^ns	0.23^ns	0.08^ns	0.36^* * Significant by the 5% F test,	176.1^* * Significant by the 5% F test,	159.01^ns	583.54^ns
WA x SB	3	0.18^ns	0.36^ns	0.06^ns	0.12^ns	27.8^ns	155.39^ns	54.96^ns
EN x WA x SB	3	0.41^ns	0.52^ns	0.11^ns	0.14^ns	123.99^ns	81.58^ns	385.99^ns
Resíduo - EN	6	0.65	4.69	0.09	0.36	113.99	330.15	574.29
Resíduo - WA	6	0.06	0.17	0.18	0.13	122.77	613.77	1,014.16
Resíduo - SB	36	0.23	0.52	0.04	0.09	48.3	308.61	455.23
TotalOverall mean	63	4.89	3.53	1.94	2.83	46.33	39.81	86.14
CV - EN (%)		16.47	61.39	15.9	21.38	23.04	45.64	27.82
CV - WA (%)		5.25	11.81	22.06	13.15	23.91	62.22	36.97
CV - SB (%)		9.87	20.48	10.73	10.80	15	44.12	24.77

Universidade Federal Rural do Semi-Árido Avenida Francisco Mota, número 572, Bairro Presidente Costa e Silva, Cep: 5962-5900, Telefone: 55 (84) 3317-8297 - Mossoró - RN - Brazil
E-mail: caatinga@ufersa.edu.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *Corresponding author