The water deficit is considered one of the main limiting factors of agricultural production, studies that aim to understand it become essential for improving productivity and rational use of water resources. Thus, the objective of this work was to evaluate the influence of the reduction of the fraction of transpirable soil water (FTSW) under the growth variables of the nine clones that compose the variety "Diamante Incaper ES8112" of the coffee Conilon and to estimate the critical FTSW (when the growth potential is reduced by the limitation of the transpiration process). The nine experiments were conducted in a greenhouse, located in the Center of Agrarian Sciences and Engineering of the Federal University of Espírito Santo, in the city of Alegre-ES, (20º45' S, 41º32' W and altitude of 269.0 m). The present study was carried out in the greenhouse, located in the Center Original Research Article

The production of specialty coffee has several factors and parameters that are added up in the course of production, so that the quality is expressed in the act of consumption. Based on this scenario, this study included the analysis of ten genotypes of arabica coffee, the materials being subjected to irrigated and rainfed water regimes, in a low altitude region, to identify responses for sensory and physical–chemical quality. The genotypes were evaluated in a split-plot scheme with a randomized block design, with three replications. Arabica coffee fruits were harvested with 80% cherry seeds and processed by the wet method. Subsequently, the characteristics related to physical–chemical and sensory analyses were evaluated. The genotypes of the Paraíso group showed great variability for the physical–chemical and sensory variables for rainfed and irrigated regimes. The genotypes of the Catuaí group, however, showed less variability for sensory characteristics in both cultivation environments and for physical–chemical characteristics in the irrigated regime. In the sensorial data set, the genotypes Catuaí 144 CCF and Catuaí 144 SFC (when irrigated) and Paraíso H 419-3-3-7-16-2, Paraíso H 419-3-3-7-16-11 and Catucaí 24-137 (rainfed cultivation), are more favourable to the production of specialty coffee at low altitude.

A agricultura irrigada no Brasil cresceu mais de 40% nos últimos 20 anos, representando uma área de 4,4 milhões de ha, com a região Sudeste representando 47% deste total. O método de irrigação por pivô é o que mais cresce, com os estados de Minas Gerais, Goiás, Bahia e São Paulo concentrando cerca de 80% da área ocupada pela tecnologia. Neste cenário, a atualização das informações torna-se fundamentais pois criarão bases de conhecimento que irão ajudar estabelecer diretrizes para adoção e planejamento de políticas públicas que venham a contribuir para o uso estratégico dos recursos hídricos. Foi realizado fotointerpretação na escala de 1:1000, em imagens satélite da plataforma Google EarthTM Pro, para identificação do equipamento e obtenção de sua área de ocupação. Com os dados coletados realizou-se análises em função dos municípios, microrregiões e bacias hidrográficas. Atualmente, estima-se uma área irrigada de 134.741,11 hectares e 2.301 pivôs centrais. Os municípios de Rio Paranaíba (302), Perdizes (164), Santa Juliana (135), Uberaba (120) e Patos de Minas (111) destacam-se em maior número de equipamentos. A Microrregião de Araxá abrange a maior concentração de pivôs, 694, com 40.728,94 hectares irrigados. Na Bacia do Rio Paranaíba concentra-se 85,75% dos pivôs.Palavras-chave: sensoriamento remoto, sistema de irrigação, recursos hídricos. SCENARIO OF THE AREA IRRIGATED BY CENTRAL PIVOT IN THE TRIÂNGULOMINEIRO, IN THE STATE OF MINAS GERAIS, BRAZIL ABSTRACT: Irrigated agriculture in Brazil has grown over 40% in the last 20 years, representing an area of 4.4 million ha, with the Southeast region representing 47% of this total. The pivot irrigation method is the fastest growing, with the states of Minas Gerais, Goiás, Bahia and São Paulo concentrating around 80% of the area occupied by technology. In this scenario, updating the information becomes fundamental because it will create knowledge bases that will help establish guidelines for the adoption and planning of public policies that will contribute to the strategic use of water resources. It was realized photointerpretation in scale of 1: 1000, in satellite images of the platform Google EarthTM Pro, for identification of the equipment and obtaining of its area of occupation. With the data collected, analyzes were performed according to the municipalities, microregions and river basins. Currently, an irrigated area of 134,741.11 hectares and 2,301 central pivots is estimated. The municipalities of Rio Paranaíba (302), Perdizes (164), Santa Juliana (135), Uberaba (120) and Patos de Minas (111) stand out in more equipment. The Araxá Microregion encompasses the highest concentration of pivots, 694, with 40,728.94 irrigated hectares. In the Paranaíba River Basin, 85.75% of the pivots are concentrated.Keywords: remote sensing, irrigation system, water resources.

The objective of this research was to group C. canephora cv. Conilon coffee genotypes of different ripening cycles for both efficient absorption and utilization of N, P and K in contrasting environments. The experiment was arranged in a factorial scheme 13x4, with fours replicates, the factors being: 13 genotypes of Conilon coffee and four types of fertilization (NPK: 0%-100%-100%, 100%-0%-100%, 100%-100%-0% and 100%-100%-100% of the level recommended). The results indicated that conilon coffee genotypes have efficiencies to absorb and use N, P, K modulated by the availability of these nutrients in the soil, furthermore it was possible to assume that conilon coffee genotypes of early ripening cycle have high joint efficiencies of absorption and utilization in environment with adequate NPK supply. To optimize the nutritional management, the genotypes 67 and 76 would be recommended for plantations with low technological potential to better exploit their efficiencies of absorption and use of N, P and K; and the genotypes 02, 48 and 67 would be recommended for crops with high technological potential where, besides the nutritional efficiency, their responsiveness could be explored. For breeding programs, it is recommended the exploitation of conilon genotypes 02 and 67, for presenting simultaneously high absorption and utilization efficiency of NPK.

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The experiment was carried out in the Experimental Area of ​​the Plant Genetic Improvement Sector of the Agricultural Sciences Center of the Federal University of Alagoas (SMGP-CECA-UFAL), in the year 2013, where periods of control and weed coexistence of sweet potatoes were evaluated. The experimental design was carried out in randomized blocks in the 3 x 14 factorial scheme with three replications, with three sweet potato genotypes in 14 periods of interference, and distributed in seven control periods (0, 10, 20, 30, 40, 50 and 60 days after planting - DAP), from which the weeds were controlled, and seven coexistence periods, from which the weeds coexisted with the crop. The evaluations consisted of sweet potato genotype shoot samplings at 30, 60, 90, and 120 days after planting (DAP), using one working area plant per plot in each evaluation stage. In the determination of the leaf area, a mechanical integrator was used, and to obtain the shoot dry mass, the material was taken to a forced air circulation oven at 65 ºC for 72 h, with subsequent weighing. According to the results, it can be observed that, in the coexisting treatments, there was a significant reduction in the shoot growth rates, in comparison to the treatments in which the weeds were controlled, especially the reduction of the leaf area at 120 DAP, where clone 6 and Sergipana showed a reduction of 89.0% and 88.0%, respectively. As for Clone 14, this reduction occurred at 90 DAP, at about 52.0%, which was less expressive, whereas in relation to the shoot dry mass, clones 6, 14, and the Sergipana variety showed a reduction at 120 DAP of 86%, 51%, and 46%, respectively.

CRESCIMENTO DO CAFEEIRO CONILON CULTIVAR “ES8122-JEQUITIBÁ” EM FUNÇÃO DA FRAÇÃO DE ÁGUA TRANSPIRÁVEL NO SOLO     WILIAN RODRIGUES RIBEIRO1; VINICIUS AGNOLETTE CAPELINI2; DANIEL SOARES FERREIRA3; MORGANA SCARAMUSSA GONÇALVES1 E EDVALDO FIALHO DOS REIS1   1Departamento de Engenharia Rural, Programa de Pós-Graduação em Produção Vegetal do Centro de Ciências Agrárias e Engenharias da Universidade Federal do Espírito Santo - UFES, Alto Universitário S/N, Bairro Guararema, CEP: 29.500.000, Alegre, ES, Brasil, wilianrodrigues@msn.com; morganascg@gmail.com; edreis@cca.ufes.br. 2Departamento de Engenharia Rural, Programa de Pós-Graduação em Engenharia Rural da Universidade Federal de Viçosa - UFV, Avenida Peter Henry Rolfs, S/N, Campus Universitário, CEP: 36.570.900, Viçosa, MG, Brasil, vinicius91ac@hotmail.com. ³Departamento de Fitotecnia, Programa de Pós-Graduação em Fitotecnia da Universidade Federal de Viçosa - UFV, Avenida Peter Henry Rolfs, S/N, Campus Universitário, CEP: 36.570.900, Viçosa, MG, Brasil, daniel.s.soares@ufv.br.     1 RESUMO   O Estado do Espírito Santo destaca-se como maior produtor de café conilon do Brasil, porém a deficiência hídrica tem sido o fator abiótico mais limitante da produção. Desta forma, objetivou-se neste trabalho, quantificar a influência do déficit hídrico no solo, pela metodologia da fração de água transpirável do solo (FATS), verificando o valor crítico onde se inicia a redução da transpiração relativa (TR), e do potencial de crescimento das plantas, através das variáveis: área foliar relativa (AFR) e altura relativa (ALR). O presente estudo foi desenvolvido em casa de vegetação da Universidade Federal do Espírito Santo, localizada no município de Alegre-ES. Utilizaram-se os nove clones que compõe a cultivar “ES8122-Jequitibá”, espécie Coffea canephora. O experimento foi constituído de dois tratamentos e quatro repetições. Os tratamentos foram: T0 (sem déficit hídrico, plantas irrigadas durante todo experimento) e T1 (déficit hídrico induzido até as plantas atingirem 10% da transpiração relativa do tratamento T0). Verificou-se que cada clone apresentou um comportamento específico em função do decréscimo FATS. O clone 02 foi o mais susceptível, apresentando redução da transpiração em valores de 0,90 da FATS. O clone 09 mais resistente, mantendo o processo transpiratório constante até valores de 0,56 da FATS.   Palavras-chave: déficit hídrico, Coffea canephora, fats, irrigação.     RIBEIRO, W. R.; CAPELINI, V. A.; FERREIRA, D. S.; GONÇALVES, M. S.; REIS, E. F. GROWTH OF COFFEE CONILON CULTIVAR “ES8122-JEQUITIBÁ” AS FUNCTION OF  TRANSPIRABLE WATER FRACTION IN SOIL     2 ABSTRACT The state of Espirito Santo stands out as the largest producer of Conilon coffee in Brazil, but water deficit has been the most limiting abiotic factor of production. Thus, the objective of this work was to quantify the influence of water deficit on the soil, by the fraction of transpirable soil water (FTSW) methodology, verifying the critical value where the reduction of relative transpiration (RT), and the potential plant growth, through the variables: relative leaf area (RLA) and relative height (RH). The present study was conducted in a greenhouse of the Federal University of Espírito Santo, located in the city of Alegre-ES. The nine clones that make up the cultivar “ES8122-Jequitibá”, species Coffea canephora, were used. The experiment consisted of two treatments and four repetitions. The treatments were: T0 (without water deficit, plants irrigated during the whole experiment) and T1 (induced water deficit until the plants reached 10% of the relative transpiration of treatment T0). Each clone showed a specific behavior as  function of the FTSW decrease. Clone 02 was the most susceptible, presenting a reduction in sweating by FTSW values ​​of 0.90. The most resistant, clone 09, kept the transpiratory process constant up to FTSW values ​​of 0.56.   Keywords: water deficit, Coffea canephora, FTSW, irrigation.

The objective of the study was to differentiate genotypes with higher efficiency and responsiveness to nitrogen supply, to understand how the nitrogen supply can impact the dry matter allocation and the accumulation of this nutrient in the different plant compartments of genotypes of conilon coffee, cultivated under contrasting conditions of nitrogen availability in the soil. The plants were cultivated during 150 days in pots containing 10 kg of soil, in greenhouse. The experiment was set up in a 13×2 factorial scheme, following a completely randomized design (CRD) with three replications. The factors were: 13 genotypes and two levels of nitrogen fertilization (0 and 100% of the N recommended level). The N supply increased between 70 and 210% of the total dry matter and between 360 and 680% of the concentration of N content in leaves of the genotypes of conilon coffee. It was possible to observe that the expression of the genotypes was modulated by the availability of N in the soil, since they presented different behaviors in the studied environments (with 0 or 100% of N supply in the soil). The genotypes CV-03, CV-07 and CV-08 were classified as non-efficient and non-responsive, while the genotypes CV-01, CV-04 and CV-09 of conilon coffee were classified as efficient and responsive.