Gas exchanges and production of colored cotton irrigated with saline water at different phenological stages

Soares, Lauriane Almeida dos Anjos; Fernandes, Pedro Dantas; Lima, Geovani Soares de; Suassuna, Janivan Fernandes; Pereira, Rennan Fernandes

doi:10.5935/1806-6690.20180027

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Engenharia Agrícola • Rev. Ciênc. Agron. 49 (2) • Apr-Jun 2018 • https://doi.org/10.5935/1806-6690.20180027 copy

Gas exchanges and production of colored cotton irrigated with saline water at different phenological stages¹ 1 Parte de Dissertação de Mestrado da primeira autora apresentada no Programa de Pós-Graduação em Engenharia Agrícola CTRN/UFCG.

Trocas gasosas e produção do algodoeiro colorido irrigado com água salina em diferentes estádios fenológicos

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Scarcity of good-quality water is a limiting factor for irrigated agriculture, especially in semi-arid regions, which leads to the use of water with high salt content to irrigate crops. Therefore, this study aimed to evaluate physiological aspects and production of colored cotton genotypes under saline stress, during the different development stages and under conditions of low and high salinity. The experiment was conducted using a randomized block design, with a 3 × 7 factorial scheme and three replicates. Treatments corresponded to three colored cotton genotypes irrigated with low-salinity water (0.8 dS m^-1) and high-salinity water (9.0 dS m^-1): T1-A₁B₁C₁, T2-A₂B₁C₁, T3-A₁B₂C₁, T4-A₁B₁C₂, T5-A₂B₁C₂, T6-A₂B₂C₁ and T7-A₁B₂C₂ (A₁, B₁ and C₁: without salinity and A₂, B₂ and C₂: with salinity; in the vegetative, flowering and fruiting stages, respectively). Among the genotypes, BRS Rubi was the most sensitive to irrigation water salinity, regardless of development stage. Successive application of saline water at the flowering and boll formation stages led to drastic reduction in physiological aspects of the crop, with recovery of the plants after the stress was interrupted. Saline water irrigation at initial development stages can be used in the cotton crop for reducing the average time to the beginning of flowering. Seed cotton production was more affected by application of saline water at the flowering and boll formation stages.

Key words:
Gossypium hirsutum L.; Water scarcity; Salinity

Density	Total Porosity	OM	Moisture (kPa)		Available water	Sorption Complex				pHsp	EC_se
Density	Total Porosity	OM	33.42	1519.5	Available water	K⁺	Na⁺	Ca⁺²	Mg⁺²	pHsp	EC_se
(kg dm^-3)	(%)	dag kg^-1	dag kg^-1		(%)	(cmol_c kg^-1)				-	dS m^-1
1.67	38.59	21.20	11.48	2.41	9.07	0.18	0.37	2.37	3.09	5.80	0.20

Variables	DAS	DF	MSq	DF	MSq	DF	MSq	CV%	Overall Mean
Variables	DAS	DF	Management Strategies (MS)	DF	Genotypes (G)	DF	MS x G	CV%	Overall Mean
gs	37	1	0.0055*	2	0.0003^ns	2	0.0013^ns	16.58	0.2005
E		1	0.2787^ns	2	0.0559^ns	2	0.0306^ns	9.79	2.6085
A		1	0.0896^ns	2	0.6536^ns	2	5.1551^ns	13.51	15.3675
WUEi		1	1.5922^ns	2	0.1155^ns	2	0.2954^ns	13.95	5.9311
Ci		1	1867.2853^ns	2	75.7842^ns	2	129.3021^ns	12.09	192.4814
CEi		1	0.0006^ns	2	0.00002^ns	2	0.0001^ns	23.68	0.0844
gs	59	3	0.0339**	2	0.0005^ns	6	0.0022^ns	28.66	0.1678
E		3	5.1323**	2	0.4068^ns	6	0.3811^ns	18.84	3.5056
A		3	97.1252**	2	11.1883^ns	6	6.7393^ns	19.33	16.0259
WUEi		3	0.4168^ns	2	0.4094^ns	6	0.0175^ns	10.49	4.7861
Ci		3	1970.1478*	2	622.1321^ns	6	323.9594^ns	16.18	143.4074
CEi		3	0.0017^ns	2	0.0016^ns	6	0.0003^ns	24.22	0.1179
gs	113	6	0.0337**	2	0.0004^ns	12	0.0002^ns	21.16	0.1293
E		6	10.4424**	2	0.0724^ns	12	0.0846^ns	22.11	2.9974
A		6	109.0878**	2	6.4652^ns	12	2.2722^ns	13.93	11.8575
WUEi		6	1.8826**	2	0.8686^ns	12	0.2304^ns	14.45	4.3776
Ci		6	6642.7695**	2	1652.9949*	12	378.7082^ns	13.51	163.9153
CEi		6	0.0014**	2	0.0015**	12	0.0004^ns	24.06	0.0761

Variation sources	DF	Mean Square
Variation sources	DF	NDANT	SCW
Management Strategies (MS)	6	4.932^ns	29205.163**
Genotypes (G)	2	4.608^ns	5389.677**
MS x G	12	5.170*	406.921^ns
Blocks	2	16.513**	44.154^ns
Residual	40	2.346	308.221
CV (%)		3.03	10.33
Overall Mean		50.619	169.874

Management Strategies	Genotypes
Management Strategies	BRS Rubi	BRS Topázio	BRS Safira
T1- A1B1C1	49.222 bA	49.777 aA	51.444 aA
T2- A2B1C1	51.111 aA	49.666 aA	52.444 aA
T3- A1B2C1	48.888 bA	49.444 aA	49.222 aA
T4- A1B1C2	52.555 aA	49.444 aB	50.111 aAB
T5- A2B1C2	52.000 aA	51.000 aA	51.111 aA
T6- A2B2C1	49.555 bA	52.333 aA	51.333 aA
T7- A1B2C2	52.666 aA	48.888 aB	50.777 aAB

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Gas exchanges and production of colored cotton irrigated with saline water at different phenological stages1 1 Parte de Dissertação de Mestrado da primeira autora apresentada no Programa de Pós-Graduação em Engenharia Agrícola CTRN/UFCG.

Trocas gasosas e produção do algodoeiro colorido irrigado com água salina em diferentes estádios fenológicos

ABSTRACT

Gas exchanges and production of colored cotton irrigated with saline water at different phenological stages¹ 1 Parte de Dissertação de Mestrado da primeira autora apresentada no Programa de Pós-Graduação em Engenharia Agrícola CTRN/UFCG.