The objective of this work was to evaluate the concentrations and accumulation of macronutrients in conilon coffee (Coffea canephora) fruit, and their concentrations in leaves, over two years, in irrigated and nonirrigated coffee plants. Three-year-old conilon coffee plants of the cultivar Emcapa 8111 genotype 02 were used. An experimental design was carried out in randomized complete blocks, in a split-plot arrangement, with 14 replicates. The main plot factor was irrigation versus nonirrigation of coffee plants, and the split-plot factor was different fruit and leaf collection times. Collections began 10 days after the beginning of flowering and were performed on average every 28 days, until full fruit ripening. At each sampling date, five plants per treatment were picked out, by collecting one plagiotropic branch by plant, separated into fruit and leaves. Each part was dried, weighed, and subjected to the chemical analysis. Macronutrient accumulations and their accumulation rates were determined. According to the regression analysis of the data, fruit macronutrient accumulation curves fit best to sigmoidal equations. Irrigation affects the macronutrient dynamics in fruit and leaves during the fruiting phase of conilon coffee, and increases the accumulation of nutrients in the plant tissues. The macronutrients found in greater quantities are N, K, and Ca, in fruit and leaves, regardless of the irrigation treatment.

Coffee genotypes cultivated in the Amazonian region have been gaining increasing prominence in Brazilian plantations. This study aimed to quantify nutrient accumulation in the fruits, grains, and husks of Robusta coffee genotypes cultivated in the Brazilian Amazon and estimate genetic diversity. The experiment was conducted in Alta Floresta D’Oeste—Rondônia, Brazil. To assess nutrient accumulation, fresh fruits were collected. These were dried, processed, separated into grains and husks, and subjected to chemical analysis. Nutrient accumulation in fruits, grains, and husks, as well as the grain/husk ratio, underwent analysis of variance through the F-test (p < 0.01. For each evaluated trait, the experimental coefficient of 337 variation (CVe), genetic coefficient of variation (CVg), and genotypic determination coefficient (H²) were also estimated. Variability was observed among Robusta coffee genotypes, with VP06, AS4, and AS10 being the most dissimilar. LB080 had the lowest dry fruit weight and the lowest percentage of grains in relation to husks. ZD156 accumulated more K in the grains, while VP06 and AS10 were the genotypes that accumulated more nutrients in the husks. Nutrients N, K, Ca, and P are accumulated in larger quantities, necessitating the calibration of mineral fertilization dosages and distribution.

A grande quantidade de resíduos industriais que constituiu atualmente sérios problemas ambientais tem alertado para a utilização adequada desses materiais que, além de reduzir os impactos ambientais, tem demonstrado potencial para utilização na agricultura. O objetivo deste estudo foi avaliar os efeitos químicos da aplicação de diferentes doses de escória de siderurgia e óxido de magnésio em dois solos sob o cultivo de café arábica. O estudo foi desenvolvido em casa de vegetação do Centro de Ciências Agrárias da Universidade Federal do Espírito Santo, em vasos de 10 dm³. O delineamento experimental foi instalado em blocos casualizados, com distribuição fatorial de 2 x 3 x 6, com três repetições, sendo os fatores: dois solos (Latossolo Vermelho-Amarelo distrófico de textura argilosa e Latossolo Vermelho-Amarelo distrófico de textura média); três insumos (calcário como controle e escória de siderurgia e óxido de magnésio como resíduos); seis doses dos materiais corretivos (0; 25; 50; 75; 100 e 125% da necessidade de calagem). Após 180 dias de cultivo, procedeu-se as análises de pH, H+ + Al3+, Al3+, Ca2+ e Mg2+. Os resultados mostraram que as aplicações de doses crescentes de escória e óxido de magnésio até o limite estudado neste trabalho favorecem um decréscimo da acidez do solo. O óxido de magnésio demonstrou maior potencial como corretivo de acidez de solo e como fonte de magnésio para o solo. The large amount of industrial waste which currently causes serious environmental problems has demonstrated the need for the appropriate use of those materials which not only reduce environmental impact but have shown potential for agricultural use. The aim of this study was to evaluate the chemical effects of different amounts of slag and magnesium oxide on two soils planted with coffea arabica. The study was carried out using pots of 10 dm³ in a greenhouse at the Center for Agrarian Sciences of the Federal University of Espirito Santo. The experimental design was of randomized blocks with a factorial distribution of 2 x 3 x 6, and three replications, the factors being: two soils (dystrophic red-yellow clay loam and dystrophic red-yellow medium-texture loam), three additives (limestone as control and slag and magnesium oxide as waste), six amounts of corrective materials (0; 25; 50; 75; 100 and 125% of the required liming). After 180 days of culture, analysis of pH, H+ + Al3+, Al3+, Ca2+ e Mg2+ was carried out. The results showed that applications of increasing doses of magnesium oxide and slag, up to the limit of this study, further a decrease in soil acidity. Magnesium oxide has shown the greatest potential for soil-acidity correction and also as a source of magnesium for the soil

O estudo da eficiência nutricional de plantas enxertadas de cafeeiro é importante para a seleção de combinações enxerto/porta-enxerto, visando atingir melhor desenvolvimento e produção. Este trabalho teve como objetivo avaliar as diferenças na eficiência de absorção e utilização de B, Zn, Cu e Mn em mudas enxertadas de cafeeiro. O experimento foi conduzido em vasos de 20 litros contendo como substrato terra, areia e esterco na proporção de 3:1:1, onde as plantas permaneceram por um período de 18 meses. Utilizaram-se como enxerto quatro genótipos de Coffea arabica L.: os cultivares Catuaí-Vermelho IAC 15 ('Catuaí 15') e Oeiras MG 6851 ('Oeiras') e os híbridos H419-10-3-4-4 ('H419') e H514-5-5-3 ('H514') do programa de melhoramento da EPAMIG/UFV. Como porta-enxerto foram empregados cinco progênies de famílias de meio-irmãos de clones de Coffea canephora Pierre ex Froenher cv. Conilon: ES 21, ES 36, ES 26, ES 23 e ES 38 do programa de melhoramento de café robusta do Incaper. O delineamento experimental foi inteiramente casualizado, com 24 tratamentos e três repetições, sendo quatro pés-francos e 20 combinações de enxertia. A eficiência nutricional das plantas variou conforme a combinação enxerto/porta-enxerto. O cultivar Oeiras não foi beneficiado por nenhuma enxertia, apresentando redução da produção total de matéria seca em todas as combinações comparativamente ao respectivo pé-franco. O cultivar Catuaí 15 foi mais eficiente na produção de matéria seca e utilização de B e Zn quando combinado com os materiais genéticos de conilon ES 26 e ES 23.

The objective of this study was to evaluate the nutritional efficiency of phosphorus in clones of conilon coffee, in greenhouse condition. A factorial design 13 x 4 was used, with three replications, and the factors being: 13 clones that compose the clonal cultivar "Vitória Incaper 8142" and four levels of phosphorus fertilization (0%, 50%, 100% and 150% of the recommended P 2 O 5 for the culture) in a completely randomized design (CRD). The cultivation consisted of a period of 150 days, then in each experimental unit, the values of dry matter and phosphorus content of the vegetative parts were obtained. The indices of nutritional efficiency (absorption, translocation and utilization) were calculated. The clones of conilon coffee showed different behavior for all variables at each level of fertilization with P 2 O 5 . The mass of dry weight, phosphorus content, and efficiency of phosphorus utilization of the clones increase linearly with the increase of P 2 O 5 . The efficiency of phosphorus absorption, depending on the levels of P 2 O 5 applied to the clones of conilon coffee, has set to a quadratic model. The translocation efficiency of phosphorus, depending on the levels of P 2 O 5 applied, is different for clones of conilon coffee, with a linear characteristic and also quadratic.