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All publications of “Ignácio Hernan Salcedo”

9 results

Physical, Chemical, and Microbiological Properties of Soil under Different Plant Covers in the Seridó Desertification Region in the Brazilian Semiarid

Adriana Ferreira Martins, Ignácio Hernan Salcedo, Flávio Pereira de Oliveira ORCID logo , Walter Esfrain Pereira

08/Mar/2019

ABSTRACT The Seridó Desertification Region is a result of inadequate management of the native Caatinga vegetation, which generated degraded areas with little or no capacity for plant production. The area has experienced a succession of different land uses, but little is known about the impact of these changes. The present study tested the hypothesis that the intense degradation of the Caatinga drastically decreased vegetal biomass production, which favored direct soil exposure and resulted in a lower abundance and diversity of […]

Soil CO2 flux: a method comparison of closed static chambers in a sugarcane field

Walane Maria Pereira de Mello Ivo, Ignacio Hernán Salcedo

01/Apr/2012

A large variety of techniques have been used to measure soil CO2 released from the soil surface, and much of the variability observed between locations must be attributed to the different methods used by the investigators. Therefore, a minimum protocol of measurement procedures should be established. The objectives of this study were (a) to compare different absorption areas, concentrations and volumes of the alkali trapping solution used in closed static chambers (CSC), and (b) to compare both, the optimized alkali […]

Kinetics of phosphorus sorption in soils in the state of Paraíba

Hemmannuella Costa Santos, Fábio Henrique Tavares de Oliveira, Ignácio Hernan Salcedo, Adailson Pereira de Souza, Valério Damásio da Mota Silva

01/Aug/2011

The soil P sorption capacity has been studied for many years, but little attention has been paid to the rate of this process, which is relevant in the planning of phosphate fertilization. The purpose of this experiment was to assess kinetics of P sorption in 12 representative soil profiles of the State of Paraíba (Brazil), select the best data fitting among four equations and relate these coefficients to the soil properties. Samples of 12 soils with wide diversity of physical, […]

Fertilization efficiency of potato with farm manure plus fertilizer-N (15N) and residual effect on millet

Fabio Freire de Oliveira, Ignacio Hernan Salcedo, Vânia da Silva Fraga

01/Apr/2011

The N content of the sandy soils in the semi-arid region of Paraíba State cultivated with potato (Solanum tuberosum) is low. Annual applications of farm manure (FM) and mineral N, determined on an empirical basis, have led to accumulation and/or loss of soil nutrients. Thus, the objective of this study was to determine the efficiency of ammonium sulphate (15N) combined with FM applied to potato as well as the residual effects on subsequent millet. A field experiment on an Alfisol […]

Distribution of 137Cs in three representative soils of pernambuco state, Brazil

Patrik Diogo Antunes, Everardo Valadares de Sá Barretto Sampaio, Antônio Luiz Gonçalves Ferreira Júnior, Izabel Cristina Luna Galindo, Ignácio Hernan Salcedo

01/Jun/2010

Contents of 137Cs have been used to quantify soil loss or accumulations, based on values of reference sites with little soil disturbance in the last decades. In Northeastern Brazil no such sites have been evaluated yet. Three areas with flat topography, native vegetation and undisturbed soil were selected in of Goiana, Araripina and Sertânia counties, state of Pernambuco. Four points in each area were marked at a distance of 20 to 50 m away from each other and soil samples were […]

Soil phosphorus fractions in sandy soils amended with cattle manure for long periods

Sandra Regina da Silva Galvão, Ignacio Hernan Salcedo

01/Jun/2009

Phosphorus fractions were determined in soil samples from areas fertilized or not with farmyard cattle manure (FYM) and in samples of FYM used in the semi-arid region of Paraiba state, Brazil. Soil samples were taken from the 0-20; 20-40 and 40-60 cm layers of 18 cultivated areas, which, according to interviews with farmers, had been treated with 12 to 20 t ha-1 FYM annually, for the past 2 to 40 years. Soil samples were also collected from four unfertilized pasture […]

Propagules of arbuscular mycorrhizae in p-deficient soils under different land uses, in semi-arid NE Brazil

Regina Lúcia Félix de Aguiar Lima, Ignácio Hernan Salcedo, Vânia da Silva Fraga

01/Apr/2007

The conversion of tropical dry forest into areas used for subsistence agriculture or livestock production is a common feature of the semi-arid region of NE Brazil. Our study looked into the effect of these land use changes on propagules of arbuscular mycorrhizal fungi (AMF) at ten sites distributed in the states of Paraíba and Pernambuco. Each site consisted of an area under native vegetation (Dry-Forest) adjacent to a cultivated area in the same slope position. Soil samples were taken at […]

Organic fertilization of potato with manure and, or, Crotalaria juncea. I – Long term plant productivity and soil nutrient stocks

Tácio Oliveira da Silva, Rômulo Simões Cezar Menezes, Holm Tiessen, Everardo Valadares de Sá Barreto Sampaio, Ignácio Hernan Salcedo, Luciano Marcal da Silveira

01/Feb/2007

Potato (Solanum tuberosum L.) is an important cash crop in the semi-arid region of Paraíba, Brazil. However, potato productivity is limited by low soil fertility and the limited and highly variable precipitation pattern of this region. Animal manure is the main nutrient source for soil fertility amelioration, but farm manure available is usually not enough to fertilize crops. A cover crop could decrease the demand for animal manure. The characteristics of Crotalaria (Crotalaria juncea L.) recommend it as green manure. […]

Carbon and nitrogen fractions as affected by texture, relief and land use in the Vaca Brava watershed

Sandra Regina da Silva Galvão, Ignacio Hernan Salcedo, Antonio Clementino dos Santos

01/Dec/2005

Productivity in subsistence or low-input agriculture depends on the release of nutrients through mineralization of soil organic matter (SOM). For this reason, SOM quantity and quality are two important variables related to the sustainability of subsistence family farming. The objective of this work was to study the interrelationships among soil use, texture and relief, at basin scale, on the concentration of total soil C (Ct) and N (Nt), the oxidizable C fraction with 16.5 mol L-1 KMnO4 (Cox) and the amino-sugars fraction […]