Raimundo Thiago Lima da Silva

• Federal Rural University of Amazonia

Agroforestry systems are productive land-use strategies that combine agriculture and forestry. However, the influence of the age of these systems on soil restoration is still poorly understood and serves to inform appropriate management practices. In this context, this study aimed to investigate the potential of agroforestry systems of different ag...

Corn (Zea mays L.) is one of the most cultivated grains in the world. It provides widely used products such as food, feed, raw materials for industry and ethanol, mainly due to the quantity and nature of its reserves accumulated in the grains. The objective of this research was to evaluate different depths of sowing and the use of different initial...

Knowledge on the ideal conditions for the formation of high quality seedlings is fundamental to guarantee establishment success of crops in a safe and efficient manner. Here, we evaluate the effect of different substrates and irrigation frequencies on the initial growth of parica (Schizolobium parahyba var. amazonicum) seedlings. The experiment was...

Andiroba (Carapa guianensis Aubl.-Meliaceae) is considered an Amazonian forest species with great potential for multiple use in natural forests. Because it is a native species of the Amazon rainforest, it has great socioeconomic importance for the extractive population due to the oil extracted from its seeds. The speed of emergence is an important...

The influence of biodiversity and age of agroforestry systems (AFS) on the provision of ecosystem services, such as nutrient cycling, needs to be better understood to support management practices that promote such services. This study aimed to quantify and compare litter stock and the physical and chemical attributes of soil in four AFSs with diffe...

Secondary forests constitute important regenerating areas and they are expanding rapidly in the Amazonian landscape. The characterization of forest remnants provides essential information for conservation, management and recovery actions. The objective of the present study was to conduct a floristic and phytosociological evaluation of an urban frag...

The deterioration of soil quality has been widely studied and debated in Soil Science. Thus, this work aims to evaluate the effect of soil management systems, regarding the soil physical attributes. A New Holland tractor was used, model TL75, 4 x 2 TDA, in a randomized block design, with a split-plot plot scheme (5 x 3), that is, five soil tillage...

Paricá is a native tree to the Amazon region recognized for several socioeconomic applications. However, there are few studies on the influence of irrigation regime in the seedling stage. Thus, the objective of the research was to evaluate the effect of water depths and irrigation frequency on the development of Paricá seedlings in the edaphoclimat...

Due to rainfall and high temperatures, the Amazonian soil undergoes changes in its source material and leaching of base cations. This results in deep, infertile, and acidic soil. Aluminum present in acidic soil impairs plant growth and development by inhibiting root formation, enzymatic reactions, absorption, transport, and nutrient utilization. Th...

O objetivo deste trabalho foi avaliar os efeitos de diferentes frequências de irrigação no desenvolvimento de mudas de açaizeiro no município de Capitão Poço - PA. O experimento foi conduzido em casa de vegetação na Universidade Federal Rural da Amazônia (UFRA), Campus Capitão Poço – Pará, entre julho a dezembro de 2016, sob delineamento inteiramen...

The Brazilian trade balance shows positive surpluses every year, due to the strong performance of the Brazilian agribusiness, which has played a fundamental role in the country's economy. In view of the economic scenario the peppercorn culture has shown great importance in the Brazilian export market. Considered a commodity this has its transaction...

The objective of this study was to evaluate the development of pitaya cuttings in different substrates under different frequencies of irrigation. The experiment was conducted from January to May 2017 in a greenhouse at the Universidade Federal Rural da Amazônia, Capitão Poço, Pará, Brazil. A completely randomized 3 × 7 factorial design with four re...

To capture surface water and groundwater, in most cases, electrical or fuel energy is required to drive a motor pump. This work aims to evaluate and compare the hydraulic characteristics of a hydraulic ram built with different volumes of PVC air chambers, according to its efficiency and economy. The study was developed at the Federal Rural Universi...

Tachigali vulgaris L. G. Silva & H. C. Lima is a pioneer species with great potential for reforestation. The inadequate supply of phosphorus and potassium results in nutritional disorders, requiring nutritional complementation. This study aimed to evaluate the effect of phosphorus (P) and potassium (K) doses on Tachigali vulgaris gas exchange. Thre...

Aims: Determine the sample size and the Pearson correlation between the characteristics of the crambe and sunflower plants. Study Design: Samples were collected from 108 crambe and sunflower plants. Place and Duration of Study: The research was carried out at the Federal Rural University of Amazonia from November 2014 to February 2015. Methodology:...

Este trabalho teve como objetivo avaliar a influência do turno de rega sobre o desenvolvimento de mudas de pitaia, produzidas em ambiente protegido, assim como estabelecer um intervalo de tempo em dias, confiável entre as irrigações. O experimento foi realizado na área experimental da Universidade Federal Rural da Amazônia, Campus Capitão Poço, Par...

O objetivo deste trabalho foi determinar o melhor comprimento da estaca para a produção de mudas de pitaia (Hylocereus costaricensis) em ambiente protegido. O experimento foi realizado na Universidade Federal Rural da Amazônia, Campus Capitão Poço – Pará, em delineamento inteiramente casualizado com cinco tratamentos e quatro repetições, sendo cada...

A temperatura do ar e um dos principais parâmetros agrometeorologico que afeta a fenologia das culturas agricolas, por esta principalmente relacionada a taxa de fotossintese, afetando tambem o plastocrono. Com isso, esse fato tem motivado a realizacao de inumeros trabalhos sobre este fenomeno, utilizando-se diversos metodos para a mensuracao e esti...

In the Brazilian Amazon, the peach palm is grown almost exclusively for fruit, especially for low-income farmers. The aim of this study was to characterize and biometrics fruit of peach palm in the city of Capitão Poço - PA and its implications in relation market were weight of fresh fruit, baked fruit weight and weight of the pulp. The ripe fruit,...

This study aimed to evaluate the morphometric characteristics of andirobeira seeds in the floodplains of the Guama River in the town of Ourem and Capitão Poço, in northeastern Pará. The fruit of Carapa guianensis Aublet, from five different matrices with a minimum distance of 300 meters, were collected from the ground after the natural detachment o...

O feijão caupi é uma das leguminosas mais consumidas nas regiões Norte e Nordeste do Brasil, representando uma importante fonte de proteína, energia, fibras e minerais. Com o objetivo de obter equações que, por meio de parâmetros lineares dimensionais das folhas, que permitam estimar a área foliar do feijão caupi, das cultivares BRS Potengi e BRS T...

The Parkia gigantocarpa is a neotropical tree that naturally occurs in terra firme forest and floodplain. The aim of the study was to evaluate the physiological and biochemical behavior in young plants of P. gigantocarpa subjected to waterlogging conditions. The waterlogging was imposed at approximately 5 cm above the blade surface of the soil usin...

In order to obtain an equation that permits the estimation of guava leaf area through the dimensional linear parameters of the leaves, a study was conducted in the Polytechnic School of the Universidade Federal de Santa Maria. The guava leaves were collected on four occasions, at 30, 45, 60 and 75 days after pruning. The leaf area was determined by...

Sorghum has a great growth potential cultivation in Brazil since offering resistance to water deficit. The aim of the study was to evaluate the physiological and biochemical behavior in sorghum plants subjected to water deficit. The experiment was conducted in a greenhouse at the Universidade Federal Rural da Amazonia, in Belém city, State of Pará,...

The objective of this study was to estimate the plastochron in the culture of Crambe in two sowing dates in the municipality of Captain Well in the state of Pará The experiment was conducted in the experimental area of the Capitão Poço, Campus Federal Rural University of Amazonia, PA, where the seeding was done in September 2013 and January 2014 an...

Todos os aspectos de crescimento e desenvolvimento das plantas podem ser afetados pela deficiência hídrica e saturação de água nos tecidos, causada pela excessiva demanda evaporativa e/ou limitado suprimento de água. As conseqüências na planta pelo alagamento vão ser clorose, murchamento prematuro, queda da capacidade fotossintética, do potencial h...

The aim of the study was to evaluate the influence of water stress on yield components of hybrid of sorghum BR-700. The experiment was conducted in a greenhouse at the Federal University of Rural of Amazônia, Belém city, State of Pará, Brazil. The experiment was carried out in the completely randomized design in a 2 x 3 factorial scheme, consisting...

RESUMO: A gravioleira é uma planta de clima tropical, sendo cultivada nas regiões Norte, Nordeste, Centro-Oeste e Sudeste do Brasil. A suspensão hídrica ocasiona mudanças nos processos bioquímicos da planta. Este trabalho tem por objetivo verificar o efeito do estresse hídrico nos teores dos pigmentos fotossintéticos, nas concentrações de aminoácid...

This study aimed to evaluate under field conditions the efficiency in the use ofN coated with urease inhibitor in maize. The experiment was conducted in the year of 2007/2008. The experimental design was a randomized block design in a factorial 2 x 6, with five repetitions, constituted the N sources (common and coated with urease inhibitor) and lev...

The objective of this study is to identify, through the application of factor analysis and cluster analysis, the spatial organization of the micro hydrographic regions (MRHs) of the State of Pará, as a result of the technology level used in agriculture, the volume of investments, financed credit and by the incorporation of modern means of productio...

In order to obtain equations which, through dimensional linear parameters of the leaves, allows the estimation of leaf area of rangpur lime (Citrus limonia (L.) Osbeck) an experiment was conducted in a rural area of Capitão Poço - PA. Leaf area was determined by the method of discs. Linear, linear without intercept, quadratic, cubic, logarithmic, e...

This study aimed to (i) determine efficient mathematical models, and (ii) estimate the leaf area in Piper nigrum plants, using the dimensional parameters of leaves with different sizes. This study was conducted with Piper nigrum L. (cv. Singapore), being 1200 trees with age of four years. Linear, linear without intercept, quadratic, cubic, logarith...

The aim of this study was to evaluate the development of young Swietenia macrophylla plants grown in Yellow Oxisol submitted to different liming and boron doses. Experimental design was completely randomized in factorial arrangement ({pipe}4x4{pipe}+1), with additional treatment (control), being 4 liming levels (0.5, 1.0, 1.5 and 2.0 t ha -1) combi...

The cowpea is a leguminous of great importance for human consumption, providing a source of protein for most of urban population of northern Brazil, therefore the aim of this paper was to evaluate the efficiency of strains of Bradyrhizobium out in association with phosphate and potassium fertilization (PK) in cowpea at the field level in the munici...

The cowpea is a leguminous of great importance for human consumption, providing a source of protein for most of urban population of northern Brazil, therefore the aim of this paper was to evaluate the efficiency of strains of Bradyrhizobium out in association with phosphate and potassium fertilization (PK) in cowpea at the field level in the munici...