Research Article

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Diagnosing foliar nutritional status is essential for fertilizer recommendations and for the identification of nutrient imbalances. This study aimed to verify genetic diversity and establish mean standards (leaf nutrient contents; LNCs) and relationships among leaf nutrients (LNC relationships; LNCRs) in seven conilon coffee genotypes during both pre-flowering and bean-filling stages. ... more

W.R. Gomes; W.P. Rodrigues; H.D. Vieira; M.G. Oliveira; J.R.M. Dias; F.L. Partelli; W.R. Gomes; W.P. Rodrigues; H.D. Vieira; M.G. Oliveira; J.R.M. Dias; F.L. Partelli
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Knowledge of the leaf characteristics of the coffee tree, such as leaf dimensions, is of great importance for management of this crop, since it directly impacts on plant development. We evaluated the genetic diversity of 43 Coffea canephora genotypes and developed and compared mathematical models for estimating the leaf area of distinct genotypes using ... more

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Cross-pollination and gametophytic self-incompatibility reduce the stability of Coffea canephora genotypes. This is an important crop for Brazil, the largest producer of this type of coffee and also a major exporter. The study of biometric characteristics is essential to assist in the selection of promising plant materials. We examined the diversity of ... more

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Limited information on oocytes and fertilization prevents the efficient therapy of patients with infertility. The most important reason for this lack of understanding is a deficiency in research dedicated to oocytes and fertilization. Currently, we are concerned with the role of nutrition in the process of oocyte development to better understand the relationship between nutrition and ... more

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Fertilization; Grain yield; Topcross

The aim of this study was to identify inbred progenies of S0:1 maize (Zea mays L.) plants that were efficient at a low level of technology and responsive at a high level of technology through the use of topcrosses. Two contrasting environments were created using two levels of base fertilization and topdressing, so that the levels of nitrogen, phosphorus, and potassium ... more

C.S. Rodrigues; C.A.P. Pacheco; M.L. Guedes; R.G.V. Pinho; C.R. Castro; C.S. Rodrigues; C.A.P. Pacheco; M.L. Guedes; R.G.V. Pinho; C.R. Castro
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Biometrics; Coffea arabica; Genetic variability; Mineral nutrition; Plant breeding; Selection process

Genetic parameters and associations between morpho-agronomic traits and nutritional efficiencies of arabica coffee cultivars were estimated to identify promising traits to assist in the selection of coffee genotypes efficient in potassium use, under limiting conditions of this nutrient. The experiment was conducted in a greenhouse with 20 arabica coffee cultivars grown in nutrient ... more

W.M. Moura; Y.J.B. Soares; A.T.Amaral Júnior; G.A. Gravina; L.D. Barili; H.D. Vieira; W.M. Moura; Y.J.B. Soares; A.T.Amaral Júnior; G.A. Gravina; L.D. Barili; H.D. Vieira
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Coffee; Diversity; Mineral nutrition; Water deficit

We examined the effect of water availability on the nutritional balance of 15 genotypes of the clonal cultivar “Conilon BRS Ouro Preto” of Coffea canephora grown in two contrasting environments in terms of water availability. Biomass production and nutritional balance parameters, based on the deviance from the standard ratio among nutrients for the species ... more

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Coffee; Genotypes; Mineral nutrition; Multivariate analysis; Variability

Coffea canephora shows considerable variability for several agronomic traits, including nutritional efficiency. Beside the intrinsic nutritional efficiency of a genotype, the availability of water in the soil is another factor that can cause different responses, which suggests the possibility of selection of genotypes to enhance the nutritional efficiency ... more

L.C.T. Starling; L.D. Martins; W.N. Rodrigues; T.M. Reinicke; T.V. Colodetti; J.F.Tdo Amaral; F.L. Partelli; M.A. Tomaz; M.C. Espindula