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All publications of “Clesio Gianello”

18 results

Natural Fertility and Metals Contents in Soils of Rio Grande do Sul (Brazil)

Daiana Althaus, Clesio Gianello, Marino José Tedesco, Kelly Justin da Silva, Carlos Alberto Bissani, Regina Felisberto


ABSTRACT: The parent geological materials and formation factors influence the chemical, physical, and mineralogical properties and composition of the soil. Therefore, the aims of this study were to determine the chemical and some physical and mineralogical properties of the soil useful for agricultural practice; to determine the natural contents of the semitotal metals in soils of the state of Rio Grande do Sul (Brazil); and to suggest use of the quality reference values (QRVs) in accordance with Resolution 420/2009 of […]

Nutrient Release, Plant Nutrition, and Potassium Leaching from Polymer-Coated Fertilizer

Henrique Bley, Clesio Gianello, Lenio da Silva Santos, Lisiane Priscila Roldão Selau


ABSTRACT The increase in food consumption and limitations in food production areas requires improved fertilizer efficiency. Slow- or controlled-release fertilizers are an alternative for synchronizing nutrient availability with the plant demands, reducing losses to the environment. The aim of this study was to evaluate the efficacy of polymer-coated KCl compared with conventional KCl. The products were incubated in soil under controlled conditions to evaluate the time required for nutrient release. A greenhouse experiment was performed with corn plants in pots […]

Substitution of Clay Content for P-Remaining as an Index of the Phosphorus Buffering Capacity for Soils of Rio Grande do Sul

Douglas Antonio Rogeri, Clesio Gianello, Leandro Bortolon, Magno Batista Amorim


ABSTRACT Mehlich-1 soil extract is currently used in Rio Grande do Sul (RS) and Santa Catarina (SC) States, in Brazil, to evaluate soil phosphorus available to plants and Mehlich-1 is sensitive to soil buffering capacity. This limitation is overcome partly by soil separation into buffering classes based on soil clay content. However, soil clay content has some technical and operational limitations, such as the underestimation of soil clay levels in soils under no-till. The aim of this study was to […]

Root Distribution of Peach Rootstocks Affected by Soil Compaction and Acidity

Henrique Belmonte Petry, Michael Mazurana, Gilmar Arduíno Bettio Marodin, Renato Levien, Ibanor Anghinoni, Clésio Gianello and, [...]


ABSTRACT Root growth can be limited by physical and chemical conditions of the soil. Compacted and acidic soils, where there is an occurrence of exchangeable Al, constitute barriers to use of the soil by plant roots. The hypothesis of this study was that physical and chemical properties of the inter-row soil of a peach orchard influence the root distribution of different rootstocks. The aim of this study was to describe and register the soil physical and chemical properties and root […]

Solubility of Heavy Metals/Metalloid on Multi-Metal Contaminated Soil Samples from a Gold Ore Processing Area: Effects of Humic Substances

Cácio Luiz Boechat, Vítor Caçula Pistóia, Ana Cristina Ludtke, Clesio Gianello, Flávio Anastácio de Oliveira Camargo


ABSTRACT Bioavailability of heavy metals at contaminated sites is largely controlled by the physicochemical properties of the environmental media such as dissolved organic matter, hydroxides and clay colloids, pH, soil cation exchange capacity and oxidation-reduction potential. The aim of this study was to investigate soil pH and heavy metal solubility effect by levels of humic and fulvic acids applied in soil samples with different levels of contamination by heavy metals. The soil samples used in this study were collected in […]

Calibration for potassium extraction methods for no-tillage soils

Jairo André Schlindwein, Leandro Bortolon, Clesio Gianello


Fertilizer recommendations in Rio Grande do Sul and Santa Catarina (RS and SC) states are based on studies of crops grown under conventional tillage and knowledge accumulated over the years. In this period, the crop system and soil sampling depth were altered and crop yields increased; this can affect the critical values of K, the fertility status and fertilizer quantity required by crops. This study aimed to determine the levels of available K extracted by Mehlich-1, Mehlich-3 and ion-exchange resin […]

Available potassium in soils of southern Brazil estimated by multielement methods

Leandro Bortolon, Clesio Gianello, Jairo André Schlindwein


Potassium (K) availability to plants is estimated based on the exchangeable K fraction. Multielement methods increase the analysis efficiency in soil laboratories. The cation exchange capacity (CEC) of soils may affect the prediction of available K. Thus, the purpose of this study was to estimate the available K for corn and soybean in soils in the Rio Grande do Sul (RS) state using Mehlich-1 (M1), Mehlich-3 (M3), ion-exchange resin (resin), ammonium acetate pH 7.0 (AcNH4), and verify whether the CTC affects […]

Simultaneous multielement extraction with the Mehlich-1 solution for Southern Brazilian soils determined by ICP-OES and the effects on the nutrients recommendations to crops

Leandro Bortolon, Clesio Gianello


The amounts of macro (P, K, Ca and Mg) and micronutrients (Cu and Zn) extracted with the Mehlich-1 (M1) solution, by the 1.0 mol L-1 KCl (KCl) and with the 0.1 mol L-1 HCl (HCl) for representative soil types of the Rio Grande do Sul state (Brazil) were compared with those extracted with the Mehlich-1 solution determined with the inductively coupled plasma optical emission spectroscopy (ICP). The amounts of nutrients extracted by the different methods showed high correlation coefficients. On […]

Phosphorus extracted with Mehlich-1 determined by colorimetric and ICP methods in South Brazilian soils

Leandro Bortolon, Clesio Gianello


The adoption of ICP technique to determine P in soil testing has been questioned, due the values determined with this technique is not comparable that those determined with colorimetric method. In the USA, some laboratories are restricted to adopt the ICP technique due the follow reasons: the nutrient recommendations to plants were developed for colorimetric method for P determination; significantly differences have been obtained between P determined with colorimetric and ICP techniques, because the high plasma temperature can measure other […]

Undisturbed soil sampling equipment for research in controlled conditions

Leandro Bortolon, Clesio Gianello, Osmar Conte, Elisandra Solange Oliveira, Renato Levien


Soil fertility can be evaluated by several methods, such as field or greenhouse tests with plants. In greenhouse studies with untilled soils the sampling of undisturbed soil cores is difficult. The aim of this study was to propose an equipment for undisturbed soil core sampling of untilled soils for greenhouse studies and test its efficiency. A sampler with a diameter of 200 mm and depth of 300 mm was developed. The soil penetration resistance and density of the soil and […]

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