Luke Gatiboni

North Carolina State University | NCSU · Department of Soil Science

Phosphorus (P) is an essential nutrient for crop and animal production and human health; however, it could potentially harm the environment and its inhabitants when it is mined and used in unsustainable ways. Therefore, establishing harmony between agricultural needs and the environment is critical and is consistent with STEPS 25-in-25 vision. The...

Establishing Cu and Zn transport limits to soil solution, may be a parameter to regulate maximum allowable concentrations of these heavy metals in soils. The study aimed to estimate Cu and Zn contents in soil mixtures with varying clay and soil organic matter (SOM) contents, from which the two heavy metals are transported to the soil solution. Samp...

The improvement of the chemical conditions of the soil in the subsurface is indicated as an alternative to increasing soybean yields because it is related to greater efficiency of water and nutrient use, such as phosphorus (P). The study aimed to evaluate the soil chemical changes and the soybean yield due to the application of P and gypsum. For th...

Bases are chemical species that donate electrons, accept protons, or release hydroxyls (OH– ) in aqueous solution. In Soil Science, “base saturation”, “exchangeable bases” or “basic cations” has been widely used to distinguish Ca2+, Mg2+, Na+ , and K+ from H+ and Al3+ cations. This terminology is confusing since none of these cations are truly a...

The increase in flue‐cured tobacco (Nicotiana tabacum) yields in recent decades due to genetic improvements of new cultivars and management technologies may increase the plant demand for Cl, and the increased dry mass may dilute Cl concentration, thereby reducing negative effects. This study evaluated the effect of increasing doses of Cl on tobacco...

Repeated phosphorus (P) inputs can lead to the accumulation of surplus P in soil with enhanced potential risk of transfer and accelerated eutrophication of aquatic environments. Intensive pork production in Rio Grande do Sul in southern Brazil results in the generation of large quantities of P-rich waste in the form of pig slurry, which is used to...

Several studies have reported increased copper (Cu) and zinc (Zn) levels in agricultural soils worldwide, mainly due to organic waste and successive leaf fungicide applications in crops. However, the critical transfer thresholds in soils, which can indicate the real risk of environmental contamination and toxicity to plants, remain poorly understoo...

Soils with low potassium (K) availability require corrective fertilization for grain crops. The recommended rate to increase K availability up to the critical level depends on the soil K buffering capacity (KBC). This study aimed to quantify the KBC and recalculate the rates necessary to reach the K critical level in 23 soils from Southern Brazil....

In an integrated crop-livestock system (ICLS), system fertilization exploits the nutrient cycling imposed by animal grazing and increases the system efficiency. An increasingly popular approach to fertilization in southern Brazil is anticipating P and K requirements for soybeans into the pasture phase. This can increase the use efficiency of these...

Zinc (Zn) and copper (Cu) are necessary micronutrients for crop production. However, excess Zn and Cu applied through land application of manures can result in Zn and Cu toxicity, reducing yields. With many integrators and little information on the formulation of poultry feeds in North Carolina (NC), it is difficult to predict the fractionation of...

This study aims to evaluate the influence of the ground cover rate by crop residues and the rain time elapsed after the application of liquid swine slurry (LSS) under losses of water, sediments, and phosphorus (P). The study was carried out under a Humic Cambisols. Two areas were delimited: with and without the application of LSS. Each area was sub...

The elemental sulfur (S0 ) application may reduce soil pH, benefiting plants adapted to acid conditions and lessening problems of overliming. Nevertheless, there is no official recommendation for its application. The objective of the study was to quantify the S0 doses required to reduce the pH of soils from Southern Brazil. The experiment was carri...

The objective of this study was to quantify the losses of water, sediments and phosphorus (P) fractions by surface runoff as a function of terrain slope and P rates applied in two soils with contrasting textures. Six field trials installed in 2015 were evaluated in 2018 and 2019, in a Nitisol and in a Cambisol, with 642 and 225 g kg − 1 of clay. Av...

Soil‐test correlation and calibration data are essential to modern agriculture, and their continued relevance is underscored by the expansion of precision farming and the persistence of sustainable soil management priorities. In support of transparent, science‐based fertilizer recommendations, we seek to establish a core set of required and recomme...

Water stress is a limiting factors for soybean crop development, and it may increase due to subsurface soil acidity. The use of agricultural gypsum is a way to improve the soil chemical conditions at depth and mitigate the undesirable effects caused by water restriction during drought periods. This study aimed to evaluate whether gypsum application...

The degradation of soil and water quality encourages research to assess the effects of rainfall on the losses of soil and chemical elements that result from surface runoff. In seasons of high surface runoff, the collectors must support the total volume drained or allow its correct estimation to avoid misinterpretation of the data. The present inves...

The beetroot is widely grown in Brazil, but little is known about its fertilization with sulfur (S). To evaluate the response of the beet culture to different doses of elementary S (0, 30, 60, 90, 120, and 150 kg ha-1), a randomized block experiment was carried out in Cambisol soil distributed in beds with 1,0 m wide x 5.34 m long. The soil pH was...

The phosphorus (P) rates recommended for corrective fertilization-P of soils from southern Brazil may be insufficient to reach the critical level for optimal plant growth. This study aimed to quantify the fertilizer-P rates for total correction fertilization with varying soil buffering capacity in the states of Rio Grande do Sul (RS) and Santa Cata...

A wide variety of soil phosphorus (P) fractionation schemes have been developed and used extensively for over 60 years, however, most are laborious and provide limited information on key parameters such as P mobility and adsorption. We propose an alternative multi-stage extraction technique that it is possible to complete in one day. This involves...

The primary aim of this work was to assess the effect of rates of gypsum used alone and in combination with limestone on (a) soil nutrient contents and acidity, and (b) soybean and maize yields, on a subtropical coarse-textured Ultisol with a low cation exchange capacity (CEC) under no-tillage (NT). For this purpose, a field experiment using differ...

Soils with continuous application of swine slurry (SS) may present high phosphorus (P) content and high risk for environmental pollution. The aim of this study was to characterize the forms of phosphorus accumulation in 15 fields with increasing degrees of P saturation (DPS) in a watershed with a high density of swine farming. Soil samples collecte...

The purpose of this study was to evaluate how the different phosphorus fractions in soils contribute to plant uptake, based on the combination between the sequential P fractionation developed by Hedley and path analysis. Successive crops were grown on soil samples with different P legacies, taken from the 0.00-0.10 m layer of an untilled Latossolo...

Repeated applications of phosphorus (P) fertilizers result in the buildup of P in soil (commonly known as legacy P), a large fraction of which is not immediately available for plant use. Long-term applications and accumulations of soil P is an inefficient use of dwindling P supplies and can result in nutrient runoff, often leading to eutrophication...

Phosphorus (P) loss from agricultural areas to waterbodies is a worldwide concern. However, the effect of soil source and transport factors, as clay (C) content and slope (S) degree, under the magnitude of the P transport in Brazilian Subtropical soils still incipiently know. The objectives of this study were i) to quantify the loss of P fractions...

Plasma agriculture details the role of nonthermal plasma in the development of plants from seeds to crops. Several publications reported enhanced plant growth, improved stress tolerance, and antimicrobial effects of plasma treatment and plasma‐treated water. In this review, we present an overview of the recent plasma agriculture literature and put...

(edaphic filters drive Myrtaceae assemblages) Aims This study investigated whether soil chemistry act as abiotic drivers of Myrtaceae assemblages, and also investigated the occurrence of indicator species. Methods We first characterize the edaphic conditions of forest fragments occupied by Myrtaceae assemblages in Subtropical Araucaria Forest. Th...

The Pampa's rangeland in South America is underused or replaced by annual crops or forest cultivation with higher economic returns. Our goal was to test the long term effects of phosphorus fertilizer and limestone applications on P availability, aluminum neutralization in deep soil layer and rangeland productivity. For this, three rates of three ph...

The overloading of soil with manure or mineral fertilizers enhances phosphorus (P) availability, promoting its loss to water bodies and increasing the risk of eutrophication. In this sense, the establishment of an environmental P threshold is a simple and useful tool to classify soils regards its risk of P losses. Here we propose a P-threshold for...

1. Introdução O conceito de fertilidade em Sistema de Plantio Direto de Hortaliças (SPDH) difere dos conceitos vistos tradicionalmente na literatura, pois desde o manejo da produção de mudas à co-lheita visa à "saúde de planta" com a produção ótima e não a produção máxima que pode ser ob-tida pela cultura. Logicamente, muitos conceitos da fertilida...

The aim of this study was to evaluate the phosphorus (P) extraction ability of the methods Mehlich 1 (M-1), Mehlich 3 (M-3), anion exchange resin in strips (AER-ST), and anion exchange resin in spheres (AER-SP), as a function of clay content, P rates, and incubation time. Experimental units were built with 20%, 40%, 60%, and 80% of clay and five di...

This study evaluated P pools after nine years of successive application of either pig slurry (PS) or deep pig litter (DL) in a no-till Ultisol from southern Brazil. The experiment was established in Dec 2002 with the treatments control, application of 90 and 180 kg N ha-1 N as PS and as DL. In Mar 2010, soil samples were taken at six layers up to 3...

The application of phosphorus (P) to soil can increase its availability to plants and alter P fractions in annual and perennial organs of Cordia trichotoma. If a portion of P accumulates in perennial organs in organic fractions it can be used in the next growth season, possibly decreasing plant dependence on P derived from soil fertilization. Howev...

Organomineral fertilizers can replace mineral fertilizers in the fertilization of agricultural crops because of the association of the benefits of mineral and organic fertilizers. Our objective was to evaluate the agronomic efficiency of an organomineral fertilizer manufactured from poultry litter and mineral fertilizers. The experiment was carried...

A adubação fosfatada proporciona maior rendimento de grãos em solos com teores abaixo do nível de suficiência, independente da camada de aplicação. Porém, a aplicação de P em profundidade, na camada 10/20 cm, permite rendimentos mais satisfatórios, principalmente em cultivos com ocorrência de estiagem. Quando os teores de P no solo estão abaixo do...

Purpose The aim of this study was to quantify the contents and stocks of exchangeable and nonexchangeable fractions of potassium (K), calcium (Ca), and magnesium (Mg) after one and three successive Pinus taeda crops without fertilization and to predict the soil supply for further cultivations. Materials and methods The soil was analyzed in layers...

O Brasil é um dos maiores produtores de proteína animal do mundo e também um dos principais produtores de grãos, fazendo da agropecuária um dos motores da economia brasileira. Por sua interdependência, frequentemente os estabeleci- mentos agrícolas de produção de grãos são integrados com atividades de produção animal ou, quando não ocorrem no me...

In several Brazilian acid soils, the extractable aluminum with the solution of 1.0 mol L-1 KCl (Al-KCl) may exceed 10 cmol c kg-1 , but in some soils the presence of this element seems to exert little or no interference in the productivity of the plants. The study aimed to evaluate in which conditions the high levels of Al-KCl are related to the to...

The natural grasslands in South America have soils with low phosphorus (P) availability (1.0 to 7.5 mg kg −1), possibly altering the absorption and accumulation of P in grasses. We evaluated the chemical fractionation of P in the leaves of the most important grasses present in these grasslands to better understand the mechanisms involved in the sto...

The organomineral fertilizers can release organic compounds during their solubilization, and those compounds can affect the plant growth. The aim of this study was to evaluate the initial development of wheat, nutrient accumulation in the plant and soil chemical changes, with the use of organic, mineral and organomineral fertilizers. The experiment...

Use of organic fertilizers in integrated crop-livestock (iCL) systems may affect soil phosphorus fractions. This study aimed to determine phosphorus fractions in the soil under the iCL system after six years of application of organic or mineral fertilizers. The experiment was conducted on a Rhodic Kandiudox (Nitossolo Vermelho Distroférrico) in a r...

Potential soil acidity can be measured by two methods in the states of Rio Grande do Sul (RS) and Santa Catarina (SC): solution SMP or solution TSM (Buffer Santa Maria). Calibration of these methods is done by incubating soils for long periods (180 days) of CaCO3. The hypothesis of this study is that it is possible to reduce the incubation period i...

Alternativas tecnológicas podem minimizar os impactos negativos dos dejetos líquidos de suínos (DLS) sobre o ambiente, além de melhorar seu efeito como fertilizante. O objetivo deste trabalho foi comparar o efeito do modo de aplicação dos DLS e da ureia, com e sem o uso de inibidor de nitrificação dicianodiamida (DCD), sobre a evolução dos teores d...

This study aimed to evaluate the interaction between filter cake (FC), and phosphorus fertilizers with differing solubility on the growth and P nutrition of sugarcane. Effects of soil amendment with FC on different soil P fractions and influence on microbial community structure in the rhizosphere were also assessed. Two glasshouse experiments were...

The objective of this work was to evaluate changes in phosphorus fractions in a Humic Cambisol cultivated with vineyards, after 62 years of additional fertilization with poultry litter. Soil samples were collected from two vineyards (V1 and V2) and a forested area adjacent to them. A total of 1,365 and 910 kg ha-1 P were applied to V1 and V2, respe...

Grinding soil for analysis causes the destruction of aggregates and may expose adsorption sites that would not be available for adsorption in the soil with preserved structure. The study aimed to evaluate the adsorption of P in three soils with and without preserved structure, submitted to pig slurry (PS) application for a long time. Three soils (A...

Os extratores de fósforo (P) Mehlich 1 (M-1), Mehlich 3 (M-3) e Resina Trocadora de ânions (RTA) apresentam sensibilidade ao conteúdo de argila do solo. Ainda, o uso de equações para conversão do P disponível extraído por M- 3 em valores equivalentes de M-1 pode não ser adequado para um conjunto de solos contrastantes. O objetivo do trabalho é aval...

The application of nitrogen fertilizers, both organic and mineral, can cause nitrate losses by leaching. To minimize this effect, enzyme inhibitors are used. However, the effects on microbial biomass, which is the most sensitive and dynamic compartment of nutrients in the soil, as well as its effect on nutrients such as phosphorus (P) are unknown....

Phosphorus (P) reacts with chemical and mineralogical constituents in the soil, mainly in tropical and subtropical soils. Therefore, strategies have been used to reduce the adsorption of P to the soil, among them, the formation of complexes that could decrease P adsorption to the soil. Two experiments were carried out to evaluate the formation of o...

Weed management in apple orchards (Malus domestica) can affect the leaching of nitrogen (N) in soil. The study aimed to evaluate the potential leaching of N forms in soil of an apple orchard with different weed management treatments. The experiment was conducted in an apple orchard implanted in 2008. In October 2011, 80 plants were selected and the...

A cebola apresenta elevada resposta à aplicação de adubos fosfatados, sendo praticadas aplicações a lanço de doses de fósforo (P) maiores que as preconizadas pelas recomendações oficiais. Devido a seu sistema radicular restrito, é possível que a localização da adubação fosfatada permita o uso mais eficiente do nutriente, reduzindo a dose de P neces...

O cultivo da erva-mate (Ilex paraguariensis St. Hil.) apresenta grande importância econômica na região Sul do Brasil. Contudo, a necessidade de fertilização no estabelecimento de plantios de erva-mate ainda é pouco conhecida. O trabalho objetivou avaliar a adubação sulfatada no crescimento inicial de dois clones de erva-mate em um Cambissolo Húmico...

The objective of this study was to compare two methods of evaluation of potencial acidity (H+Al) and two methods to estimate liming requirement (LR) for soils from the west region of Santa Catarina State, Brazil. Fourteen soils were incubated with 7 lime rates for 120 days, obtaining the real values of H+Al at pH 7.0 and LR. These values were used...

The application of phosphorus (P)-index methodology to assess the risk of water pollution from agriculture in river basins usually takes time and expends a great amount of resources. This study adapted the P-index methodology using digital mapping of key basin risk criteria for P loss in reference areas to evaluate the wider vulnerability to P loss...

Brazil’s large land base is important for global food security but its high dependency on inorganic phosphorus (P) fertilizer for crop production (2.2 Tg rising up to 4.6 Tg in 2050) is not a sustainable use of a critical and price-volatile resource. A new strategic analysis of current and future P demand/supply concluded that the nation’s secondar...

ABSTRACT The purpose of this study was to evaluate Cu and Zn migration and fractions in sandy soil of vineyards. In Urussanga (SC), Brazil, soil samples were collected from a 4-year-old and 15-yearold vineyard, and from a forested area. In the soils, the chemical characteristics of Cu and Zn were analyzed by the EDTA method, which determines the fr...

Soil organic matter (SOM) is a key of most nutrient cycling and its content influences labile phosphorus (P) pool. In order to promote P availability from SOM, some plant strategies could be important to increase organic P mineralization, which may change among cultivars of the same crop. This study evaluated phosphorus dynamics in the rhizosphere...

ABSTRACT In Southern Brazil, agricultural soils are often treated over long periods with annual pig slurry (PS) applications, and their influence on soil nutrient dynamics should be monitored. This study aimed to evaluate the P forms accumulated in the soil and some biological and biochemical parameters of the P cycle after 19 successive PS applica...