CALCIUM SILICATE AS SALT STRESS ATTENUATOR IN SEEDLINGS OF YELLOW PASSION FRUIT cv. BRS GA1

SOUZA, TARSO MORENO ALVES DE; MENDONÇA, VANDER; SÁ, FRANCISCO VANIES DA SILVA; SILVA, MEDSON JANER DA; DOURADO, CAÍQUE SANTOS TOMÉ

doi:10.1590/1983-21252020v33n223rc

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Agricultural Engineering • Rev. Caatinga 33 (2) • Apr-Jun 2020 • https://doi.org/10.1590/1983-21252020v33n223rc copy

CALCIUM SILICATE AS SALT STRESS ATTENUATOR IN SEEDLINGS OF YELLOW PASSION FRUIT cv. BRS GA1

SILICATO DE CÁLCIO COMO ATENUADOR DO ESTRESSE SALINO EM MUDAS DE MARACUJAZEIRO AMARELO cv. BRS GA1

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Salt stress causes losses in the yields of crops, especially those of great economic and social-food importance, such as passion fruit. The objective of this study was to evaluate the effects of fertilization with calcium silicate on the mitigation of salt stress in yellow passion fruit seedlings. The experiment was conducted in a protected environment, in a randomized block design, arranged in a 4 x 3 factorial scheme, referring to four concentrations of calcium silicate (0; 2.22; 4.44 and 6.66 g per plant) and three levels of irrigation water salinity - ECw (0.5; 1.7 and 4.0 dS m^-1), with four replicates, considering five plants as experimental unit. BRS GA1 seedlings were produced in 0.5-dm³ containers filled with a mixture of soil, washed sand and aged bovine manure, in a ratio of 1:1:1 (v:v:v). Plants received calcium silicate applications according to the studied doses in three plots, at 30, 45 and 60 days after sowing. At 90 days after sowing, plants were evaluated for growth and biomass accumulation. The use of water with salinity of 4.0 dS m^-1 restricted the growth and biomass accumulation of passion fruit seedlings. The use of calcium silicate at dose of 3.5 g per plant mitigates salt stress in seedlings of passion fruit cultivar BRS GA1 when irrigated with saline water.

Keywords:
Passiflora edulis; Salinity; Silicon; Biometrics; Biomass accumulation

Samples	pH	ECse	OM	P	K⁺	Na⁺	Ca²⁺	Mg²⁺	H⁺+Al³⁺	T	Si	ESP
Samples	water	dS m^-1	g kg^-1	mg dm^-3	........................cmol_c dm^-3....................						mg Kg^-1	%
ISS	7.00	0.35	3.44	6.00	1.00	0.02	5.00	1.8	0.00	7.52	101.08	0.27
S₁Si₀	7.48	0.75	3.48	147.27	1.60	0.56	7.56	4.68	0.00	14.40	133.10	3.89
S₂Si₀	7.47	2.53	3.48	64.01	1.28	0.99	7.88	5.17	0.00	15.32	136.60	6.46
S₃Si₀	7.50	6.64	3.47	133.01	1.12	2.02	6.52	6.69	0.00	16.35	145.10	12.35
S₁Si₁	7.41	0.85	3.48	85.11	1.44	0.82	7.67	5.97	0.00	15.9	153.90	5.16
S₂Si₁	7.35	2.72	3.46	98.79	1.18	1.25	8.37	6.73	0.00	17.53	172.80	7.13
S₃Si₁	7.42	6.81	3.48	59.44	1.44	2.62	7.57	6.43	0.00	18.06	148.70	14.51
S₁Si₂	7.53	0.81	9.23	70.28	1.23	0.73	9.05	5.27	0.00	16.28	125.15	4.48
S₂Si₂	7.47	2.62	9.21	139.28	1.28	0.91	8.59	5.24	0.00	16.02	191.80	5.68
S₃Si₂	7.49	6.51	9.27	80.54	0.80	1.50	7.28	5.54	0.00	15.12	139.10	9.92
S₁Si₃	7.62	0.87	7.21	57.73	0.96	0.73	7.18	5.25	0.00	14.12	132.10	5.17
S₂Si₃	7.45	2.45	8.81	92.52	0.75	0.65	7.05	6.09	0.00	14.54	161.05	4.47
S₃Si₃	7.49	6.69	6.05	73.13	1.23	2.10	8.04	5.51	0.00	16.88	169.40	12.44

	Parameters
	pH	EC	K⁺	Na⁺	Mg²⁺	Ca²⁺	Cl^-	HCO₃ ^-	SAR
	H₂O	dS m^-1	--------------------------------------mmol_c L^-1-------------------------------------------						(mmol_c L^-1)^0.5
S1	7.37	0.50	0.31	2.79	1.20	0.83	1.90	3.30	1.96
S2	7.30	1.70	0.20	6.44	2.50	8.00	13.38	3.69	2.37
S3	7.17	4.00	0.20	29.35	2.50	8.00	36.33	3.69	10.07

Source of variation	Mean squares
Source of variation	DF	PH¹ 1 data transformed to X.	SD	NL	LA¹ 1 data transformed to X.	SDM¹ 1 data transformed to X.	RDM¹ 1 data transformed to X.	TDM¹ 1 data transformed to X.
Block	3	0.97^* * Significant at 5% probability level;	0.55^ Significant at 1% probability level;	0.71^NS	5.60^* * Significant at 5% probability level;	0.17^ Significant at 1% probability level;	0.148^ Significant at 1% probability level;	0.27^ Significant at 1% probability level;
Salinity (SAL)	2	6.27^ Significant at 1% probability level;	0.54^ Significant at 1% probability level;	3.42^* * Significant at 5% probability level;	31.28^ Significant at 1% probability level;	0.27^ Significant at 1% probability level;	0.098^ Significant at 1% probability level;	0.36^ Significant at 1% probability level;
Si doses (Si)	3	3.58^ Significant at 1% probability level;	0.61^ Significant at 1% probability level;	3.85^* * Significant at 5% probability level;	20.95^ Significant at 1% probability level;	0.21^ Significant at 1% probability level;	0.034^ Significant at 1% probability level;	0.22^ Significant at 1% probability level;
SAL x Si	6	2.49^ Significant at 1% probability level;	0.37^ Significant at 1% probability level;	1.82^* * Significant at 5% probability level;	14.39^ Significant at 1% probability level;	0.12^ Significant at 1% probability level;	0.023^ Significant at 1% probability level;	0.12^ Significant at 1% probability level;
Error	33	0.33	0.04	0.40	1.81	0.02	0.005	0.02
CV (%)		13.72	7.54	7.83	9.48	12.14	9.21	10.72
Overall mean		4.24	2.66	8.11	14.23	1.28	0.79	1.51

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