BIOMASS AND CHLOROPLAST PIGMENTS IN JACKFRUIT SEEDLINGS UNDER SALINE STRESS AND NITROGEN FERTILIZATION

OLIVEIRA, FRANCISCO ÍTALO FERNANDES DE; SOUTO, ANTÔNIO GUSTAVO DE LUNA; CAVALCANTE, LOURIVAL FERREIRA; MEDEIROS, WILIANA JÚLIA FERREIRA DE; MEDEIROS, SHERLY APARECIDA DA SILVA; OLIVEIRA, FLAVIANO FERNANDES DE

doi:10.1590/1983-21252018v31n310rc

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Agronomia • Rev. Caatinga 31 (3) • Jul-Sep 2018 • https://doi.org/10.1590/1983-21252018v31n310rc copy

BIOMASS AND CHLOROPLAST PIGMENTS IN JACKFRUIT SEEDLINGS UNDER SALINE STRESS AND NITROGEN FERTILIZATION¹ 1 Paper extracted from the Course completion work in Agronomy of the first author.

BIOMASSA E PIGMENTOS CLOROPLASTÍDICOS EM MUDAS DE JAQUEIRA SOB ESTRESSE SALINO E ADUBAÇÃO NITROGENADA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Irrigation with saline water is a worldwide necessity an excess of salts in water or in soil causes growth inhibition, and negatively affects the productivity of many crops. Application of nitrogen fertilizers may be a way of mitigating the effects of salts on plants. The aim of this study was to evaluate the accumulation of biomass and the chlorophyll pigment content in jackfruit seedlings irrigated with water of increasing salinity level in soil with nitrogen sources. The treatments were distributed in randomized blocks with four replicates and three plants per plot, arranged in a 5 × 3 factorial scheme, related to electrical conductivity levels of the irrigation water of 0.3, 1.0, 2.0, 3.0 and 4.0 dS m^-1, in soil without nitrogen, with ammonium sulfate and with urea, in a split application 60 and 75 days after sowing. An increase in the salinity of the water increased the salinity levels of soil, which was intensified by a dose of 150 mg of N, mainly when applied in the form of ammonium sulfate, inhibiting dry matter production and chlorophyll content in jackfruit seedlings. The greatest reductions in chlorophyll a and b content occurred in jackfruit seedlings irrigated with water of 4.0 dS m^-1 conductivity in the soil without nitrogen fertilization. Urea is the most suitable nitrogen source for the production of seedlings under conditions of high salinity.

Keywords:
Artocarpus heterophyllus L.; Saline stress; Nitrogen fertilization.

Fertility	Value	Physical	Value	Saline	Value
pH in water (1 : 2.5)	4.90	Ds (g cm⁻³)	1.11	pHsp	5.06
P (mg dm⁻³)	13.50	Dp (g cm⁻³)	2.67	ECse (dS m⁻¹)	0.17
K⁺ (cmol_c dm⁻³)	0.12	Pt (%)	0.58	K⁺ (mmol_c L⁻¹)	0.36
Ca²⁺ (cmol_c dm⁻³)	1.58	Sand (g kg⁻¹)	552	Ca²⁺ (mmol_c L⁻¹)	0.32
Mg²⁺ (cmol_c dm⁻³)	2.36	Silt (g kg⁻¹)	101	Mg²⁺ (mmol_c L⁻¹)	0.29
Na⁺ (cmol_c dm⁻³)	0.09	Clay (g kg⁻¹)	347	Na⁺ (mmol_c L⁻¹)	0.69
SB (cmol_c dm⁻³)	4.15	WDC (g kg⁻¹)	52	SC (mmol_c L⁻¹)	1.66
H⁺ + Al³⁺ (cmol_c dm⁻³)	7.83	FI (%)	85	Cl⁻ (mmol_c L⁻¹)	1.36
Al³⁺ (cmol_c dm⁻³)	0.80	SDI (%)	15	CO₃ ²⁻ (mmol_c L⁻¹)	0.00
CEC (cmol_c dm⁻³)	11.98	Ucc (g kg⁻¹)	23	HCO₃ ⁻ (mmol_c L⁻¹)	0.18
ESP (%)	0.75	Upmp (g kg⁻¹)	15	SO₄ ²⁻ (mmol_c L⁻¹)	0.22
V (%)	34.64	Wav (g kg⁻¹)	8	SAR (mmol_c L⁻¹)	1.76
OM (g dm⁻³)	17.00	----	---	ESP (%)	0.75
Classification	Dystrophic	Soil texture	SCL	Classification	NS

SV	DF	Mean squared
		RDM	SDM	LDM	APDM	TDM	CHLa	CHLb	CHLt	ECse
Blocks	3	0.05^ns	0.04^ns	0.11**	0.27*	0.49^ns	1826.45**	995.06^ns	864.87^ns	1.60^ns
Water (W)	4	0.85**	0.74**	0.89**	3.14**	7.17**	41236.75**	19098.83**	53434.8**	240.5**
Nitro (N)	2	0.18**	0.004^ns	0.001^ns	0.001^ns	0.19^ns	5579.00**	4817.73**	17679.7**	35.00**
W × N	8	0.12**	0.08**	0.11**	0.35**	0.81**	1824.80**	3253.72**	9160.68**	3.10^ns
Residual	42	0.02	0.02	0.02	0.07	0.11	336.39	716.18	148.49	1.82
CV (%)		14.13	22.03	11.76	13.51	11.39	4.94	14.85	6.81	15.55
Mean		0.941	0.665	1.245	1.910	2.851	387.193	180.18	565.92	8.68

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[1] ^* Corresponding author: italooliveiraufpb@gmail.com.

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BIOMASS AND CHLOROPLAST PIGMENTS IN JACKFRUIT SEEDLINGS UNDER SALINE STRESS AND NITROGEN FERTILIZATION1 1 Paper extracted from the Course completion work in Agronomy of the first author.

BIOMASSA E PIGMENTOS CLOROPLASTÍDICOS EM MUDAS DE JAQUEIRA SOB ESTRESSE SALINO E ADUBAÇÃO NITROGENADA

ABSTRACT

BIOMASS AND CHLOROPLAST PIGMENTS IN JACKFRUIT SEEDLINGS UNDER SALINE STRESS AND NITROGEN FERTILIZATION¹ 1 Paper extracted from the Course completion work in Agronomy of the first author.