Celsemy Eleutério Maia

Uterine evaluation and gestation diagnosis in owl monkey (Aotus azarai infulatus) using the B mode ultrasound

Background  Gynecological and obstetrical ultrasonography has become an indispensable tool in the routine management, health evaluation and research on captive non‐human primates.

Modelagem de funções no cálculo dos índices DRIS

O objetivo deste trabalho foi modelar o fator k e as funcoes DRIS para a diagnose foliar de mangueiras cultivadas. Dez pomares comerciais, no estagio de producao, localizados no vale do Rio Sao Francisco, foram monitorados, mensalmente, durante dois anos, por meio da coleta de amostras foliares para determinacao dos teores de N, P, K, Ca, Mg, B, Fe, Mn, Zn e Cu. Os dados foram testados quanto a normalidade e as relacoes entre as concentracoes dos nutrientes foram usadas para calcular as normas DRIS, obtendo-se media, variância e limites maximo e minimo de cada relacao dentro da populacao amostrada. Os nutrientes foram classificados como macronutrientes de resposta frequente (MAF) (N, P e K), macronutrientes de resposta rara (MAR) (Ca e Mg); micronutrientes de resposta frequente (MIF) (B, Fe, Mn e Zn) e, micronutrientes de resposta rara (MIR) (Cu). Funcoes DRIS foram desenvolvidas para cada classe de nutrientes. O modelo desenvolvido expressa o balanco nutricional das plantas cultivadas ajustado a cada nutriente e reflete o comportamento biologico das plantas como resultado da variacao da disponibilidade dos nutrientes.

Uso da regressão linear para estimativa da relação entre a condutividade elétrica e a composição iônica da água de irrigação

Several studies have been accomplished lately to evaluate irrigation water quality in the semi-arid region of the Northeast Brazil. In some of these studies, the authors have adjusted some chemical characteristics such as calcium, magnesium, sodium, chloride and sum of cations as a function of electrical conductivity (EC) through empirical equations, however attention should be given to temporal and spatial variations. In this paper, the influence of water source, time of sampling, and soil type in the linear regression determination of electrical conductivity as a function of the ions present in the irrigation water was evaluated. A 562-analysis database originated from 55 rural properties was utilized. The water samples were analyzed for pH, EC, Ca2+, Mg2+, Na+, K+, Cl-, HCO3-, CO32- , and SO42-. From January 1988 samplings in the properties were made during 411 days. The database was divided into 14 sampling times, three sources (well, river, and dam), and 10 soil types. For comparing the adjusted equations an identity model test was utilized. The adjusted linear equations with electrical conductivity as a function of the contents of calcium, magnesium, potassium, sodium, chloride, bicarbonate, carbonate, and sulfate varied significantly with time of sampling, water source, and soil type.

Qualidade ambiental em solo com diferentes ciclos de cultivo do meloeiro irrigado

Soil is an important component of terrestrial ecosystems because it preserves nutrient reserves, supports many biological. To preserve this resource and its functions, it is necessary first of all to know the conditions and the processes occurring in it, for example, through the determination of soil quality. The aim of this study was to evaluate the environmental quality in Oxisol cultivated with different growing season of muskmelon. Were collected soil samples from nine areas with different growing season and compared with the native forest. It was concluded that environmental quality decreased with crop cycles when compared with the reference area of native forest.

Época de amostragem foliar para diagnóstico nutricional em bananeira

The relationship between yield and nutrient concentration in plants is the basis used as a diagnostic criterion for foliar analysis. There are several diagnostic methods that use the analysis of plant tissues where they play a key role in the definition and interpretation of plant nutritional status. The average nutrient concentration changes during the crop cycle, which is important for defining the time of leaf sampling. The purpose of this study was to determine the best sampling time of banana leaves, assuming that the best time is when the relationship between the relative growth rate of dry matter and of nutrient uptake is 1. It was concluded that the best time to sample banana leaves for the evaluation of the nutritional status would be six months after planting.

Wet bulb dimensions in surface drip irrigation

Information on the geometry of wetted soil volume under trickle irrigation is important for design and operation of this irrigation system, and also for the management of the irrigation. For this, six experiments were installed in different soils with the objective of evaluate the dimensions of the wetted bulb as function of emitter discharged and water application time, using the power model. It was concluded that the wetted bulb dimensions can be predicted satisfactorily using the power model for all the soils tested.

Fertilization response likelihood for the interpretation of leaf analyses

Leaf analysis is the chemical evaluation of the nutritional status where the nutrient concentrations found in the tissue reflect the nutritional status of the plants. Thus, a correct interpretation of the results of leaf analysis is fundamental for an effective use of this tool. The purpose of this study was to propose and compare the method of Fertilization Response Likelihood (FRL) for interpretation of leaf analysis with that of the Diagnosis and Recommendation Integrated System (DRIS). The database consisted of 157 analyses of the N, P, K, Ca, Mg, S, Cu, Fe, Mn, Zn, and B concentrations in coffee leaves, which were divided into two groups: low yield ( 30 bags ha-1). The DRIS indices were calculated using the method proposed by Jones (1981). The fertilization response likelihood was computed based on the approximation of normal distribution. It was found that the Fertilization Response Likelihood (FRL) allowed an evaluation of the nutritional status of coffee trees, coinciding with the DRIS-based diagnoses in 84.96 % of the crops.

Índice S para avaliação da qualidade física de solos

Nowadays the concept of soil physical quality is well-established, based mainly on the indices that quantify soil quality. The S index is a new indicator of soil physical quality related to important soil characteristics. The purpose of this study was to evaluate the method of obtaining the S index and the derivative of the function of the of water retention curve, using the transformation ln(h) or not, and assess the problem of units and the restriction m = 1 - 1/n for the index calculation. It was concluded that the S index value is higher when the soil moisture used to adjust the water retention curve of van Genuchten (1980) is expressed as volumetric than as gravimetric moisture. For the same unit of soil moisture, no difference was observed in the S index for any tension unit. The S index value differs according to the use or not use of the restriction m = 1 -1/n to estimate the parameters m and n of the van Genuchten retention curve.

Estimativa de dimensões de bulbo molhado em irrigação por gotejamento superficial aplicando modelo de superfície de resposta

The information of depth and width in wetted zone soil under drip irrigation plays great significance in design and management in the irrigation system for the amount of water required to the plant. For that, six experiments were installed in different soils with the objective of evaluating the dimensions of the wet bulb in the drip irrigation depending on the emitter discharged and of the water application time, using the power model. The obtained results showed that the proposed model can be used to estimate the dimensions of the wetted bulb for the all soils.

Níveis críticos para atributos do solo pela distribuição normal reduzida em culturas anuais de subsistência

This study aimed to propose critical levels for soil chemical properties using the reduced normal distribution in areas of family subsistence farming under maize and cowpea crops in the Brazilian semiarid. Soil samples were collected on family farms in the region of Inhamuns-Crateus. To obtain the critical levels the reduced normal distribution was used which uses the productivity data and the relationship between productivity and soil chemical attributes and assigning the critical level for 90% of the maximum. Critical levels obtained for areas cultivated with maize and cowpea in the semiarid region are: OM (g kg-1): 7.3 and 7.5; pH: 6.6 and 6.5; P (mg dm-3): 8.6 and 8.2; K (mmolc dm-3): 2.8 and 2.7; Ca (mmolc dm-3): 33.3 and 22.4; Mg (mmolc dm-3): 11.2 and 9.9; and base saturation (%): 73 and 71, respectively. The critical level for reduced normal distribution can be used to obtain critical levels for soil chemical properties. The attributes most frequently for negative index over estimated critical level (NCRIz) are Ca > V > pH > Mg > K = OM > P and V > pH > P > OM > Mg > K > Ca areas for corn and cowpea, respectively.