EMERGENCE, GROWTH, AND PRODUCTION OF COLORED COTTON SUBJECTED TO SALT STRESS AND ORGANIC FERTILIZATION

SOUZA, LEANDRO DE PÁDUA; LIMA, GEOVANI SOARES DE; GHEYI, HANS RAJ; NOBRE, REGINALDO GOMES; SOARES, LAURIANE ALMEIDA DOS ANJOS

doi:10.1590/1983-21252018v31n322rc

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Ciências Florestais • Rev. Caatinga 31 (3) • Jul-Sep 2018 • https://doi.org/10.1590/1983-21252018v31n322rc copy

EMERGENCE, GROWTH, AND PRODUCTION OF COLORED COTTON SUBJECTED TO SALT STRESS AND ORGANIC FERTILIZATION¹ 1 Paper extracted from the postdoctoral research of the second author.

EMERGÊNCIA, CRESCIMENTO E PRODUÇÃO DO ALGODOEIRO COLORIDO SUBMETIDO AO ESTRESSE SALINO E ADUBAÇÃO ORGÂNICA

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

The semi-arid region of Northeast Brazil is vulnerable to problems of water scarcity and salinity, resulting in low-quality irrigation water and the need to adopt cultivation strategies that make the production system viable. Given the above, this study aimed to evaluate emergence, growth, and production of colored cotton subjected to increasing levels of irrigation water salinity and organic matter doses. The experiment was carried out in a eutrophic Regolithic Neosol with a sandy loam texture in a greenhouse in the municipality of Campina Grande - PB, Brazil. A randomized block design was used in a 4 x 4 factorial scheme with three replicates, and the treatments corresponded to four levels of electrical conductivity of water - ECw (1.7, 3.4, 5.1, and 6.8 dS m^-1) and four doses of organic matter - OM (0, 2.5, 3.5, and 4.5% based on soil volume). Increasing irrigation water salinity with ECw values above 1.7 dS m^-1 reduced emergence, growth, and production of colored cotton, and the cotton seed weight was the variable most affected by salinity. Organic matter addition led to increased cotton growth and production, especially in terms of seed weight. Increasing doses of organic matter attenuated the effect of irrigation water salinity on the number of bolls in ‘BRS Jady’ cotton.

Keywords:
Gossypium hirsutum L; Salinity; Bovine manure.

		Chemical	characteristics
pH_ps	O.M	P	K⁺	Na⁺	Ca²⁺	Mg²⁺	Al³⁺	H⁺
	(dag kg^-1)	(mg kg^-1)			(cmol_c kg^-1)
5.63	1.83	18.2	0.21	0.17	3.49	2.99	0.00	5.81
		Physical	characteristics
Size fraction (g kg^-1)			Textural	Water content (kPa)			Total	Density
Sand	Silt	Clay	class	33.42	1519.5	AW	porosity	(kg dm^-3)
					dag kg^-1		m³m^-3
572.3	100.8	326.9	SL	12.68	4.98	7.70	0.57	1.31

					Mean	squares
		ESI	SD		PH		LA
Source of variation	DF		Days after sowing
			40	60	40	60	40	60
Saline levels (SL)	3	0.12**	0.33**	2.60**	112.94**	507.96**	6366.26*	671561.75**
Linear regression	1	0.11**	0.92**	7.42**	328.77**	1520.06**	184732.31**	194289.88**
Quadratic regression	1	0.23**	0.04^ns	0.0001^ns	9.10^ns	2.16^ns	6093.68^ns	78294.00^ns
Organic matter (OM)	3	0.16**	14.32**	13.14**	1050.87**	1681.02**	390369.12**	1426656.81**
Linear regression	1	0.04**	32.43**	25.64**	1735.05**	3343.57**	948412.82**	3763409.46**
Quadratic regression	1	0.23**	9.69**	11.54**	1364.26**	1536.80**	190329.34**	513536.15*
Interaction (SL x OM)	9	0.15^ns	0.25^ns	0.37**	17.83^ns	30.46^ns	13578.14^ns	77856.94^ns
Blocks	2	0.01^ns	0.06^ns	0.02^ns	54.88*	99.44*	11452.35^ns	69149.16^ns
Residual		5.44	5.75	4.67	10.06	9.79	33.56	32.11

Source of variation	DF			Mean squares
		NDFBO	FAR	TNB	SCW
Saline levels (SL)	3	27.74^ns	11.55*	57.36**	1625.49**
Linear regression	1	53.20^ns	1.06^ns	160.06**	4653.26**
Quadratic regression	1	28.52^ns	33.33**	12.00**	213.44**
Organic matter (OM)	3	300.74**	107.88**	47.47**	1553.22**
Linear regression	1	573.50**	248.06**	123.26**	4453.95**
Quadratic regression	1	315.18**	75.01**	2.08**	205.01**
Interaction (SL x OM)	9	13.90^ns	3.55^ns	2.82**	43.86^ns
Blocks	2	73.39^ns	31.08*	1.31	5.69^ns
Residual		11.23	29.50	11.26	19.11

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

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EMERGENCE, GROWTH, AND PRODUCTION OF COLORED COTTON SUBJECTED TO SALT STRESS AND ORGANIC FERTILIZATION1 1 Paper extracted from the postdoctoral research of the second author.

EMERGÊNCIA, CRESCIMENTO E PRODUÇÃO DO ALGODOEIRO COLORIDO SUBMETIDO AO ESTRESSE SALINO E ADUBAÇÃO ORGÂNICA

ABSTRACT

EMERGENCE, GROWTH, AND PRODUCTION OF COLORED COTTON SUBJECTED TO SALT STRESS AND ORGANIC FERTILIZATION¹ 1 Paper extracted from the postdoctoral research of the second author.