-This study aimed to evaluate the use of hydro polymer retainer in the quantitative growth of coffee plants at different levels of irrigation and soil types. The experiment was conducted in pots with seedlings bag in the greenhouse of the Setor de Cafeicultura, Universidade Federal de Lavras. The experimental design was in randomized blocks in factorial (2x4x2): absence or presence of hydro polymer retainer, four levels of irrigation (25%, 50%, 75% and 100%), two soil types (sandy soil and medium texture). At 150 days evaluated the stem diameter, plant height, leaf area, number of leaves, dry weight of shoots, plant dry mass, root dry weight, root dry weight ratio of shoot, leaf area ratio, absolute growth rate, relative growth rate, net assimilation rate and leaf area index. It was concluded that the polymer hydro retainer hydrated favored the growth of coffee plants and irrigation promoted greater growth of coffee in medium textured soil compared to soils with sandy texture.Key words: Soil types. Greenhouse. Coffea arabica L.. Hydrogel.RESUMO -Objetivou-se avaliar o uso do polímero hidro retentor no crescimento quantitativo de cafeeiros em diferentes níveis de irrigação e tipos de solo. O experimento foi instalado em vasos com mudas produzidas em saquinhos, em casa de vegetação no Setor de Cafeicultura, Universidade Federal de Lavras, MG. O experimento foi conduzido em delineamento de blocos ao acaso em esquema fatorial (2x4x2): ausência ou presença do polímero hidro retentor, quatro níveis de irrigação (25%, 50%, 75% e 100%), dois tipos de solo (solo com textura média e arenosa). Aos 150 dias, avaliou-se o diâmetro de caule, altura de planta, área foliar, número de folhas, massa seca de parte aérea, massa seca de plantas, massa seca de raízes, relação massa seca de raiz e parte aérea, razão de área foliar, taxa de crescimento absoluto, taxa de crescimento relativo, taxa de assimilação líquida e índice de área foliar. Concluiu-se que o polímero hidro retentor hidratado favoreceu o crescimento de plantas de café e que a irrigação promoveu maior crescimento do cafeeiro em solo de textura média, quando comparado a solos de textura arenosa.Palavras-chave: Tipos de solo. Casa de vegetação. Coffea arabica L.. Hidrogel.

<p>Weed control is fundamental in coffee cultivation due to their high interference, competing with the crop for water, light and nutrients. Among the control methods used, chemical control is highlighted, due to its high efficiency and low cost. However, due to application failures, herbicide drift phytotoxicity is common. Aiming at the search for selective active ingredients in coffee, the objective of this study was to evaluate the selectivity of the active ingredient Glyphosate in young coffee plants. The experiment was carried out in a greenhouse with ‘Topázio MG1190’ coffee plants (<em>Coffea arabica</em> L.), cultivated in pots with an 11 L-substrate capacity. The statistical design was RBD, with four replications and four doses of the herbicide, making up 16 experimental plots. Each plot consisted of three plants. The treatments were: (i) 0%; (ii) 10%; (iii) 25% and (iv) 50% of the commercial dose of the herbicide Glyphosate. The evaluations were performed at 104 days after application of the treatments. Growth, morphological, physiological and anatomical characteristics were evaluated. The collected data were analyzed using the SISVAR software. The effect of glyphosate drift impairs plant growth. However, after 104 days of intoxication, there is no longer any effect on the physiology and leaf anatomy of coffee trees.</p>

A nutrição mineral é importante para o desenvolvimento da estrutura interna das folhas do cafeeiro, podendo favorecer as características fisiológicas necessárias para otimizar o desenvolvimento e a produtividade da cultura. Objetivou-se identificar as possíveis modificações na anatomia, fisiologia e produtividade em cafeeiros irrigados em diferentes níveis de adubação aplicados em três anos consecutivos, a partir do segundo ano após a implantação da lavoura. A lavoura de Coffea arabica cultivar Topázio MG-1190 foi formada seguindo a recomendação padrão de Guimarães et al. (1999) para adubação em função de análise do solo, até o primeiro ano após implantação (2010-2011). A partir daí, no segundo ano após a implantação (2011-2012), os níveis de adubação utilizados foram: 40, 70, 100, 130 e 160% da adubação padrão. Repetiram-se os tratamentos nos anos de 2012-2013 e 2013-2014. As plantas foram avaliadas quanto às trocas gasosas e anatomia foliar em agosto de 2014. Também foi avaliada a produtividade dos anos de 2013 e 2014. Os diferentes níveis de adubação NPK provocaram diferenças na anatomia foliar do cafeeiro. A produtividade e trocas gasosas do cafeeiro não foram afetadas pelos diferentes níveis de adubação NPK.

Water restriction significantly affects coffee (<em>Coffea arabica</em> L.) production. The study of a few agronomic techniques that optimizes water use can generate technologies for mitigating the effects of climatic variations on coffee crops. The aim of this study was to indicate agronomic techniques that mitigate the effects of water restriction on coffee crops. For this end, we analyzed the morphophysiological changes in coffee plants cultivated in a greenhouse with different types of fertilizers and soil conditioners and under two levels of irrigation. The evaluations were conducted 130 days after planting, assessing the morphological and physiological characteristics of the plants. We also quantified soil moisture in the different treatments. The water restriction expressively hindered plant growth. The use of controlled release fertilizers and soil conditioners, especially coffee husk, is indicated for mitigating water restriction in coffee crops.

The great interference of weeds in coffee plants, due to competition for water, light and nutrients, makes their control essential. Among these control methods, the chemical stands out, due to its high efficiency and low cost. However, as a function of application failures, phytotoxicity is frequent in coffee plants due to herbicide drift. Aiming to search for active ingredients selective to coffee, the objective of this study was to evaluate the selectivity of the active ingredient Chlorimuron ethyl in coffee seedlings, and its effects on plant morphology, anatomy and physiology. The experiment was carried out in a greenhouse with ‘Topázio MG 1190’ coffee plants (<em>Coffea arabica</em> L.), grown in 11-L pots. The statistical design was in randomized blocks, with four replications and four herbicide doses. Each plot consisted of three plants. The treatments were: 0%; 50%; 100% and 200% of the recommended commercial dose of the herbicide Chlorimuron ethyl. Evaluations were performed at 120 days after treatment application. Morphological, physiological and anatomical characteristics were evaluated, besides possible phytotoxicity symptoms inherent to herbicide application. The herbicide Chlorimuron ethyl caused phytotoxicity symptoms in coffee seedlings, evidenced from the leaflet dose, through leaf deformation and cracking, with growth losses not exceeding 10%, but without damage to plant physiology and anatomy.