Melon cultivation irrigated with saline waters promote chemical alterations in an acrisol

The objective of the present study was to evaluate the salinization process and the changes in the chemical properties of an Acrisol cultivated with melon irrigated with water of different saline concentrations. The experiment was carried out in the field conditions using the experimental design of randomized blocks, arranged in split-plot. The plots were composed of salinity levels of irrigation water, expressed in terms of water electrical conductivity (ECw): 0.54; 1.48; 2.02 dS m-1; and the sub-plots for melon cultivars: Sancho and Medellín (Toad Skin), Mandacaru (Yellow), Nectar (Galia) and Sedna (Cantaloupe). Soil samples were collected at the beginning and end of the crop cycle to evaluate the changes in the physical-chemical properties of the soil. The electrical conductivity of saturation extract in the soil profile varied for each cultivar, observing high salinity values in soils with cultivars with lower water demand (Sedna and Nectar). The salinity of the soil was lower than the electrical conductivity of the irrigation water in the treatments with high values of ECw. The soil pH values showed little reaction in relation to the initial values. The exchangeable sodium percentage values were approximate twice the sodium adsorption ratio of the saturation stratum.

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Concentration of injetion solution and its effects on soil and on yield of fertirrigated banana cv. Terra Maranhão

Engenharia Agrícola ◽

10.1590/s0100-69162014000600007 ◽

2014 ◽

Vol 34 (6) ◽

pp. 1104-1113 ◽

Cited By ~ 2

Author(s):

Eugênio F. Coelho ◽

Torquato M. de Andrade Neto ◽

Damiana L. Barros

Keyword(s):

Electrical Conductivity ◽

Soil Solution ◽

Irrigation Water ◽

Urea Concentration ◽

Injection Solution ◽

Combined Application ◽

Saturation Extract ◽

Randomized Design ◽

Completely Randomized Design ◽

Micro Irrigation

The Fertigation is the combined application of water and nutrients to a crop. It can be adapted to all types of agricultural crops. The objective of this study was to evaluate the effect of urea concentration in irrigation water on electrical conductivity of the soil solution and saturation extract along the first cycle of banana cv. Terra Maranhão. The experiment followed a completely randomized design with six treatments and ten replications. Treatments regarded for using three urea concentrations (1.0; 2.5 and 4.0 g L-1) in irrigation water applied by two micro irrigation systems (microsprinkler and drip). Results showed that there was a linear elevation of electrical conductivity of saturation extract and soil solution with the increase on concentration of urea in the injection solution. Urea should be used under concentrations up to 2.5 g L-1 in irrigation water without causing increase on electric conductivity of soil solution and saturation extract, considering 1.1 dS m-1 as the tolerated value for the crop. Nitrate in the soil solution increased significantly with the increase of urea concentration in the injection solution. The maximum concentration of nitrate in the soil occurred for 4,0 g L-1 concentration of the injection solution.

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METODOLOGIA PARA AVALIAÇÃO DA SALINIDADE DO SOLO EM AMBIENTE PROTEGIDO

Irriga ◽

10.15809/irriga.2009v14n3p383-397 ◽

2009 ◽

Vol 14 (3) ◽

pp. 383-397 ◽

Cited By ~ 6

Author(s):

Sergio Oliveira Pinto de Queiroz ◽

Roberto Testezlaf ◽

Edson Eiji Matsura

Keyword(s):

Electrical Conductivity ◽

Electric Conductivity ◽

Soil Salinity ◽

Vacuum Solution ◽

Irrigation Management ◽

Saline Soils ◽

Soil Electrical Conductivity ◽

Saturation Extract ◽

Productive Process ◽

Salinity Levels

METODOLOGIA PARA AVALIAÇÃO DA SALINIDADE DO SOLO EM AMBIENTE PROTEGIDO Sérgio Oliveira Pinto de Queiroz1; Roberto Testezlaf2; Edson Eiji Matsura21Departamento de Tecnologia e Ciências Sociais, Universidade do Estado da Bahia, Juazeiro, BA, [email protected]. 2Faculdade de Engenharia Agrícola, Universidade Estadual de Campinas, Campinas, SP 1 RESUMO Em condições de ambiente protegido a irrigação é essencial e a fertirrigação um agente facilitador do manejo da água e fertilização do solo; todavia, o uso contínuo e nem sempre adequado pode elevar a salinidade do solo, comprometendo o processo produtivo. Este trabalho objetivou avaliar uma metodologia para caracterizar a ocorrência de salinização em cultivos protegidos, usando diferentes métodos para determinação da condutividade elétrica do solo. Em laboratório foram avaliados os equipamentos Sensor Sigma Probe EC1, da Delta-T e extratores de solução do solo à vácuo. Os equipamentos foram utilizados em três solos com diferentes texturas e sob cinco níveis de salinidade: 0, 2, 4, 8 e 12 dS. m-1 a 25° C. Os resultados obtidos pelos métodos avaliados foram comparados ao método do extrato de saturação. O equipamento Sigma Probe EC1, por apresentar melhor correlação com o método de referência na fase laboratorial, foi utilizado nas visitas as propriedades, sob produção em ambiente protegido, na macrorregião de Campinas, revelou ser mais eficiente. A aplicação do questionário associada às leituras de condutividade elétrica do solo com o sensor Sigma Probe permitiu diagnosticar a deficiência no manejo da água e condutividade elétrica nas propriedades avaliadas. Os valores obtidos de condutividade elétrica no extrato de saturação do solo para as propriedades visitadas, não caracterizam solos salinos, mas podem afetar a produção de flores e outras plantas sensíveis à salinidade. UNITERMOS: manejo da irrigação; fertirrigação. QUEIROZ, S. O. P. de.; TESTEZLAF, R.; MATSURA, E. E. METHODOLOGY FOR SOIL SALINITY EVALUATION IN GREENHOUSE 2 ABSTRACT Under controlled environmental conditions, irrigation is essential and the use of fertigation becomes a facilitator agent for water and fertilization management. However, the intensive use of fertigation in this type of productive process can increase soil salinity, and affect productive process. This work objective was to evaluate a methodology in order to characterize the salinization process occurrence of in greenhouse farms using different methods to determine soil electric conductivity l. Sigma Probe EC1, manufactured by Delta-T and vacuum solution manufactured extractors were evaluated under laboratory conditions. The equipment was used in three different soil textures, under five salinity levels: 0, 2, 4, 8 and 12 dS. m-1 at 25° C. The obtained results of electric conductivity were compared to the saturation extract method. The Sigma Probe EC1 equipment was used in farm visits, with controlled environmental production inCampinas macro region. Among the used equipment in the laboratorial part, the sigma Probe EC1 presented the best results for soil electrical conductivity determination, when compared to saturation extract, in saline and non saline soils. Using the questionnaire for electric conductivity determinations using Sigma Probe sensor it was possible to verify the deficiency in the soil moisture and electrical conductivity management. The obtained results for electric conductivity using the saturation extract methods do not characterize saline soils on the visited farms, but they showed that the salinity levels in the soil could affect flower production and other crops sensitive to salinity. KEYWORDS: irrigation management, fertigation.

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Production of forage palm cultivars (Orelha de Elefante Mexicana, IPA-Sertânia and Miúda) under different salinity levels in irrigation water

Australian Journal of Crop Science ◽

10.21475/ajcs.21.15.07.p2824 ◽

2021 ◽

pp. 977-982

Author(s):

Márcia Cristina de Araújo Pereira ◽

Carlos Alberto Vieira de Azevedo ◽

José Dantas Neto ◽

Mariana de Oliveira Pereira ◽

Jailton Garcia Ramos ◽

...

Keyword(s):

Electrical Conductivity ◽

Irrigation Water ◽

Saline Water ◽

Salinity Level ◽

Semiarid Region ◽

Brazilian Semiarid ◽

Salinity Levels ◽

Four Levels ◽

The Impact ◽

Different Levels

Brazilian semiarid region is characterized by irregular rainy periods that limits the production of forage feed for the maintenance of agricultural livestock and causes losses in the production. Despite that, semiarid region stands out in the production of forage palm, buffering the impact of drought in the area. Thus, this study aimed at analyzing the effect of different levels of salinity in irrigation water on the production of forage palm in the semiarid region. The experiment was arranged as a complete randomized block, in a 4x3 factorial arrangement and four levels of salinity (0.2, 2.0, 3.8 and 5.6 dS m-1); three cultivars (Miúda, Orelha de Elefante Mexicana and IPA-Sertânia) with 4 replications. The variables evaluated were the following: number of primary, secondary, tertiary and total cladodes, cladode biomass and estimative of threshold salinity (SL). The results showed that irrigation with saline water with an electrical conductivity of 2.0 dS m-1 negatively affected the emission of cladodes of superior orders for all forage palm cultivars. Miúda cultivar presented the best production of fresh phytomass (13.36 kg per plant) under a salinity level of 4.04 dS m-1, followed by Orelha de Elefante Mexicana (12.55 kg per plant) under a salinity level of 2.73 dS m-1 and Baiana (11.56 kg per plant) under a salinity level of 2.17dS m-1.

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Preliminary use of a fulvic acid, as a strategy to improve water use in saline soils

Revista de la Facultad de Ciencias Agrarias UNCuyo ◽

10.48162/rev.39.016 ◽

2021 ◽

Vol 53 (1) ◽

pp. 164-175

Author(s):

Cristián Kremer ◽

José Díaz ◽

Oscar Seguel ◽

Yasna Tapia

Keyword(s):

Electrical Conductivity ◽

Fulvic Acid ◽

Water Use ◽

Irrigation Water ◽

Chemical Properties ◽

Residual Effect ◽

Saline Soils ◽

The Third ◽

Loam Soil ◽

Made In

An evaluation of a fulvic acid (FA) was made in a Loam soil, by selecting the best dose to achieve salt displacement under a drip emitter. In trial 1, PVC columns were filled with a loam soil and irrigated with a KCl solution of electrical conductivity (EC) of 12.5 dS m-1. Once the soil solution EC reached the value of the KCl solution, FA doses of 0, 2.1, 5.3 and 10.5 kg ha-1 were applied. The bulk electric conductivity and soil chemical properties were evaluated after 6 irrigation cycles. In trial 2, the same soil salinized with the KCl solution was placed in 0.8 m3 containers. Two irrigations treatments were performed: a control and the best FA dose from trial 1. The displacement of the salt bulb created from irrigation with a dropper in the soil profile was characterized. In trial 1, the dose of 5.3 kg ha-1 reached the lowest EC after the third irrigation. In trial 2, the selected dose reduced EC until 3.75 dS m-1 at 0.3 m depth at the third irrigation, saving 246 L of water compared to control. Additionally, the salinity bulbs were more horizontally extended in the FA treatment. Highlights: Application of FA (5.3 kg ha -1) reduced the water use by 50% compared to leaching carried out exclusively with water. The use of Fulvic acid showed to be an alternative to consider in the recovery of saline soils under drip irrigation when irrigation water is scarce. Little or not residual effect was found after the use of Fulvic acid.

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Computational Simulation and Prediction on Electrical Conductivity of Oxide-Based Melts by Big Data Mining

Materials ◽

10.3390/ma12071059 ◽

2019 ◽

Vol 12 (7) ◽

pp. 1059 ◽

Cited By ~ 4

Author(s):

Ao Huang ◽

Yanzhu Huo ◽

Juan Yang ◽

Guangqiang Li

Keyword(s):

Data Mining ◽

Electrical Conductivity ◽

Big Data ◽

Molten Slag ◽

Computational Simulation ◽

Chemical Properties ◽

Data Driven ◽

Gradient Boosting ◽

Big Data Mining ◽

Physical Chemical

Electrical conductivity is one of the most basic physical–chemical properties of oxide-based melts and plays an important role in the materials and metallurgical industries. Especially with the metallurgical melt, molten slag, existing research studies related to slag conductivity mainly used traditional experimental measurement approaches. Meanwhile, the idea of data-driven decision making has been widely used in many fields instead of expert experience. Therefore, this study proposed an innovative approach based on big data mining methods to investigate the computational simulation and prediction of electrical conductivity. Specific mechanisms are discussed to explain the findings of our proposed approach. Experimental results show slag conductivity can be predicted through constructing predictive models, and the Gradient Boosting Decision Tree (GBDT) model is the best prediction model with 90% accuracy and more than 88% sensitivity. The robustness result of the GBDT model demonstrates the reliability of prediction outcomes. It is concluded that the conductivity of slag systems is mainly affected by TiO2, FeO, SiO2, and CaO. TiO2 and FeO are positively correlated with conductivity, while SiO2 and CaO have negative correlations with conductivity.

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CULTIVO DO MILHETO IRRIGADO COM ÁGUA SALINA EM DIFERENTES COBERTURAS MORTAS

Irriga ◽

10.15809/irriga.2020v25n2p347-360 ◽

2020 ◽

Vol 25 (2) ◽

pp. 347-360

Author(s):

Amitair Ferreira Lima ◽

Geocleber Gomes De Sousa ◽

Maria Vanessa Pires De Souza ◽

Francisco Barroso Da Silva Junior ◽

Silas Primola Gomes ◽

...

Keyword(s):

Electrical Conductivity ◽

Irrigation Water ◽

Dry Matter ◽

Saline Water ◽

Soil Protection ◽

Saline Stress ◽

Saturation Extract ◽

Soil Saturation ◽

Number Of Leaves ◽

E Mail

CULTIVO DO MILHETO IRRIGADO COM ÁGUA SALINA EM DIFERENTES COBERTURAS MORTAS AMITAIR FERREIRA LIMA1; GEOCLEBER GOMES DE SOUSA2; MARIA VANESSA PIRES DE SOUZA3; FRANCISCO BARROSO DA SILVA JUNIOR4; SILAS PRIMOLA GOMES2 E CLARISSA LIMA MAGALHÃES5 1 Engenheira agrônoma formada pela Universidade da Integração Internacional da Lusofonia Afro-Brasileira (Avenida da abolição, 3, Centro, 62.790-000, Redenção/Ce, Brasil). E-mail: [email protected] 2 Prof. Doutor, Instituto de Desenvolvimento Rural, Universidade da Integração Internacional da Lusofonia Afro-Brasileira (Avenida da abolição, 3, Centro, 62.790-000, Redenção/Ce, Brasil). E-mail: [email protected], [email protected] 3 Mestranda pelo programa de pós graduação em fitotecnia da Universidade Federal Rural do Semiárido, Campus Mossoró (Av. Francisco Mota, 572, Bairro Costa e Silva, CEP: 59.625-900, Mossoró/RN, Brasil). E-mail: [email protected] 4 Mestrando pelo programa de pós graduação em ciência do solo da Universidade Federal do Ceará, Campus do Pici (Av. Mister Hull, 2977, Pici, 60.021-970, Fortaleza/Ce, Brasil). E-mail: [email protected] 5 Discente no curso de agronomia da Universidade da Integração Internacional da Lusofonia Afro-Brasileira (Avenida da abolição, 3, Centro, 62.790-000, Redenção/Ce, Brasil). E-mail: [email protected] 1 RESUMO Objetivou-se com o presente trabalho, avaliar o crescimento e acúmulo de biomassa de plantas de milheto irrigadas com água salina em solo com diferentes coberturas. O experimento foi realizado em agosto de 2018, a pleno sol na horta didática da Universidade da integração internacional da Lusofonia Afro-Brasileira (UNILAB), Redenção, Ceará. O delineamento experimental foi inteiramente casualizado (DIC), em esquema fatorial 5x4, com 4 repetições. O primeiro fator referente aos valores de condutividade elétrica da água de irrigação - CEa: A1 (1,0 dS m-1), A2 (2,0 dS m-1), A3 (3,0 dS 11 m-1), A4 (4,0 dS m-1) e A5 (5,0 dS m-1), versus as coberturas adotadas, C1 (sem cobertura-controle), C2 (palha de arroz), C3 (bagana de cana-de-açúcar) e C4 (resíduos vegetais de espontâneas). Aos 35 dias após a semeadura, foram avaliadas: altura das plantas (AP), número de folhas (NF), diâmetro do colmo (DC), comprimento de raiz (CR), área foliar (AF), matéria seca da parte aérea (MSPA), da raiz (MSR) e total (MST), pH do solo e a condutividade elétrica do extrato de saturação do solo (CEes). O aumento da condutividade elétrica na água de irrigação, promoveu aumento da salinidade no extrato de saturação do solo, assim como reduções na emissão do número de folhas no milheto e o uso da cobertura morta amenizou os efeitos da salinidade contida na água, nas variáveis: MSPA, MSR, MST, DC e AP, sendo a cobertura de casca de arroz a alternativa mais eficiente na atenuação desses efeitos. Palavras-chave: Penissetum glaucum L., estresse salino, proteção do solo LIMA, A. F.; SOUSA, G. G.; SOUZA, M. V. P.; SILVA JUNIOR, F. B.; GOMES, S. P.; MAGALHÃES, C. L. CULTIVATION OF MILLET IRRIGATED WITH SALINE WATER IN DIFFERENT MULCHES 2 ABSTRACT The objective of this work was to evaluate the growth and accumulation of dry matter of millet plants irrigated with saline water in soil with different mulches. The experiment was carried out in August 2018, under full sun in the didactic garden of the University of the International Integration of Afro-Brazilian Lusophony (UNILAB), Redenção, Ceará. The experimental design was completely randomized (DIC), in a 5x4 factorial scheme, with four replicates. The first factor referring to the values of electrical conductivity of the irrigation water: A1 (1.0 dS m-1), A2 (2.0 dS m-1), A3 (3.0 dS m-1), A4 (4.0 dS m-1) and A5 (5.0 dS m-1), versus the coverages adopted, C1 (without cover), C2 (rice straw), C3 (sugarcane bagana) and C4 (vegetable spontaneous waste). At 35 days after sowing, plant height (AP), number of leaves emitted (NF), stalk diameter (DC), root length (CR), leaf area (AF), shoot dry matter (MSA), root dry matter (MSR), total dry matter (MST), soil pH and soil saturation extract electrical conductivity (CEs) were assessed. The increase in the electrical conductivity in the irrigation water promoted an increase in salinity in the soil saturation extract, as well as reductions in the number of leaves in the millet, and the use of the mulch reduced the effects of the salinity contained in the water in the following variables: MSPA, MSR, MST, DC and AP, with rice husk coverage being the most efficient alternative to mitigate these effects. Keywords: Penissetum glaucum L., saline stress, soil protection.

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Pattern and direction of groundwater flow and distribution of physical-chemical properties of groundwater in Randublatung basin

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/930/1/012048 ◽

2021 ◽

Vol 930 (1) ◽

pp. 012048

Author(s):

E E Tantama ◽

M A Kumara ◽

D P E Putra ◽

G I Marliyani

Keyword(s):

Electrical Conductivity ◽

Groundwater Flow ◽

Ph Value ◽

Chemical Properties ◽

Initial Step ◽

Groundwater Potential ◽

Groundwater Temperature ◽

Alluvial Deposits ◽

Physical Chemical ◽

Tds Concentration

Abstract The people in the Randublatung basin (Grobogan, Blora, and Bojonegoro Regencies) using groundwater for daily needs and agriculture activity. As the initial step of basin-based groundwater management, it is necessary to understand the groundwater potential in this area: pattern and direction of groundwater flow and groundwater physical-chemical properties (pH, temperature, total dissolved solids, and electrical conductivity). This research aims to analyze the pattern and directions of groundwater flow, the physical-chemical properties, and the correlation between the two. This research method is field measurement of 45 different spots of dug wells in the Randublatung basin. Our results indicate that the pattern and direction of groundwater flow in the Randublatung basin are heading to Bengawan Solo River and then following the river’s flow. The groundwater physical-chemical properties measured: pH value is 6.8 on average, the temperature is 28.9 °C on average, TDS concentration is 409 mg/L average, and electrical conductivity rate is 843 μS/cm average. There is no significant correlation between groundwater flow with pH value and groundwater temperature. However, groundwater TDS concentration and electrical conductivity rate in the Randublatung basin increase as groundwater flows to the Bengawan Solo River, which is affected by the minerals of aquifer rocks (alluvial deposits).

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Features of the Structure and Physical-Chemical Properties of Poly-Ortho-Toluidine Doped with Toluenesulfonic Acid

Фізика і хімія твердого тіла ◽

10.15330/pcss.20.1.82 ◽

2019 ◽

Vol 20 (1) ◽

pp. 77-82

Author(s):

A.L. Stepura ◽

O.I. Aksimentyeva ◽

P.Yu. Demchenko

Keyword(s):

Crystal Structure ◽

Thermal Stability ◽

Electrical Conductivity ◽

Specific Resistance ◽

Oxidative Polymerization ◽

Chemical Properties ◽

Conductivity Activation Energy ◽

Physical Chemical ◽

Physico Chemical ◽

Thermal Stability Of

Features of crystal structure, electrical conductivity and thermal stability of poly-ortho-toluidine (PoTi) samples, obtained with method of oxidative polymerization in the environment of sulfuric and toluenesulfonic acids (TSA), were investigated. It was discovered that PoTi-TSA samples are characterized withhigh crystallinity. According to the physico-chemical analysis, doping samples with TSA causes increase of PoTi thermal stability, electrical conductivity and sensor sensitivity on the contrary to samples doped with sulfuric acid. Based on temperature dependence of specific resistance, were calculated the values of the conductivity activation energy, which are within the limits of 0.2-0.4 eV depending on the type of dopant.

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Response of Grafted and Non-grafted Melon Plants to High Boron and Salinity Levels

HortScience ◽

10.21273/hortsci.39.4.873e ◽

2004 ◽

Vol 39 (4) ◽

pp. 873E-873

Author(s):

Menahem Edelstein* ◽

Meni Ben-Hur ◽

Ron Cohen ◽

Yosef Burger ◽

Israela Ravina

Keyword(s):

Negative Correlation ◽

Irrigation Water ◽

Boron Concentration ◽

High Salinity ◽

Leaf Tissue ◽

Fruit Yield ◽

Foliar Injury ◽

Greenhouse Study ◽

Salinity Levels ◽

High Boron

Excess of boron and salinity in soil and irrigation water can limit the production of melons (Cucumis melo). A greenhouse study was conducted in order to compare the responses of grafted and non-grafted melon plants to combinations of high levels of boron and salinity. Boron levels were 0.25, 0.8, 2.5, 5.0, 10.0 mg·L-1 and salinity levels were 1.8 and 4.6 dS·m-1. Foliar injury caused by boron was more severe in the non-grafted than in the grafted plants. Likewise, boron accumulation in leaf tissue from non-grafted plants was higher than in grafted plants. High salinity led to decreased boron accumulation in the leaves. Fruit yield was decreased only at a boron concentration of 10 mg·L-1, and the decrease in grafted plants was smaller than that in non-grafted plants. A negative correlation was found between boron accumulation in leaves and fruit yield. The results showed that melon plants grafted on Cucurbita rootstock are more tolerant than non-grafted ones to high boron concentrations, and this can probably be explained by the decrease in boron accumulation caused by the rootstock.

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QUALIDADE DA FIBRA DO ALGODOEIRO BRS VERDE IRRIGADO COM ÁGUAS DE DIFERENTES NÍVEIS SALINOS

Irriga ◽

10.15809/irriga.2016v1n1p209-220 ◽

2018 ◽

Vol 1 (1) ◽

pp. 209 ◽

Cited By ~ 1

Author(s):

Francisco Italo Gomes Paiva ◽

Marcelo Tavares Gurgel ◽

Francisco De Assis de Oliveira ◽

Lucas Ramos Da Costa ◽

Andygley Fernandes Mota ◽

...

Keyword(s):

Electrical Conductivity ◽

Gossypium Hirsutum ◽

Irrigation Water ◽

Cotton Fiber ◽

Fiber Quality ◽

Short Fiber ◽

Gossypium Hirsutum L ◽

Third Phase ◽

Salinity Levels

QUALIDADE DA FIBRA DO ALGODOEIRO BRS VERDE IRRIGADO COM ÁGUAS DE DIFERENTES NÍVEIS SALINOS FRANCISCO ITALO GOME PAIVA1; MARCELO TAVARES GURGEL2; FRANCISCO DE ASSIS DE OLIVEIRA3 ANDYGLEY FERNANDES MOTA4;LUCAS RAMOS DA COSTA 5; HERMINIO SABINO DE OLIVEIRA JUNIOR6 1Engenheiro Agrônomo, Mestrando em Manejo de solo e agua – UFERSA/RN, [email protected];2 Engenheiro Agrônomo, Prof. Doutor, Manejo solo e agua – UFERSA/RN, [email protected];3Engenheiro Agrônomo, Prof. Doutor, Manejo solo e agua – UFERSA/RN, [email protected];4Engenheiro Agrônomo, Mestre, Doutorando, UFCG – Campina Grande/PB, [email protected];5Engenheiro Agrônomo, Mestre, Doutorando – UFERSA/RN, [email protected];6Gestor Ambiental, Mestre – UFERSA/RN, [email protected]. 1 RESUMO As fibras de algodão representam em torno de 80% das fibras utilizadas nas fiações brasileiras. Nesse contexto, o objetivo do presente estudo foi avaliar a qualidade da fibra do algodoeiro BRS verde, usando níveis de salinidade da água de irrigação. O experimento foi realizado em condições de campo na Fazenda Experimental Rafael Fernandes, de propriedade da Universidade Federal Rural do Semiárido–UFERSA no período 21/10/11 até 06/02/12. O delineamento experimental adotado foi em blocos casualizados com seis tratamentos e cinco repetições, totalizando 30 parcelas experimentais. Os tratamentos resultaram das combinações de três tipos de condutividade elétrica da água de irrigação (S1- 0,55; S2-2,16 e S3-3,53 dS m-1) de acordo com as fases de desenvolvimento da cultura (T1- S1S1S1; T2- S2S2S2; T3- S3S3S3; T4- S1S2S2; T5- S1S2S3 e T6- S1S3S3), sendo a primeira fase do semeio até 30 dias; a segunda fase inicia-se dos 31 aos 90 dias; e a terceira fase dos 91 a colheita. As variáveis analisadas foram: porcentagem de fibra, comprimento da fibra, uniformidade do comprimento, maturidade, resistência, índice micronaire, índice de fibras curtas, elongação de ruptura e índice de fiabilidade. No geral, não houve efeito da salinidade da água de irrigação sobre a qualidade de fibra do algodão BRS verde, exceto para a característica elongamento da ruptura (ELG). Deste modo, torna-se viável o uso de água com salinidade de (3,5 dS m-1) em todo o ciclo da cultura considerando as condições de realização do estudo. Palavras-chave: Gossypium hirsutum L.. Condutividade elétrica. Características tecnológicas da fibra. PAIVA,F.I.G.;GURGEL,M.T.;OLIVEIRA,F.A.;MOTA,A.F.;COSTA,L.R.;JUNIOR,H.S.EQUALITY OF COTTON FIBER BRS GREEN IRRIGATED WITH DIFFERENT SALT LEVELS 2 ABSTRACT Cotton fibers represent around 80% of the fibers used in spinning mills in Brazil. In this context, the aim of this study was to evaluate the quality of the cotton fiber BRS green, using salinity levels of irrigation water. The experiment was conducted under field condition sat the Experimental Farm Rafael Fernandes, owned by Federal Rural University of the semiarid – UFERSA the period 21/10/11 to 06/02/12. The treatments consisted of combinations of three types of electrical conductivity of irrigation water (S1- 0,55; S2-2,16 and S3-3,53 dS m-1) according to the development stages of culture T1- S1S1S1; T2- S2S2S2; T3- S3S3S3; T4- S1S2S2; T5- S1S2S3; T6- S1S3S3, the first phase being 30 days from the sowing; the second stage starts from 31 to 90 days; and the third phase of the 91 harvest. The variables analyzed were: fiber percentage, fiber length, length uniformity, maturity, strength, micronaire, short fiber index, elongation at break and reliability index. Overall, there was no effect of irrigation water salinity on the fiber quality of cotton BRS green, except for the elongation characteristic of rupture (ELG). Thus, it becomes feasible to use water with salinity (3,5 dS m-1) throughout the crop cycle considering the conditions of the study. Keywords: Gossypium hirsutum L.. Electrical conductivity. technological characteristics of the fiber.

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