A5060076157- Agricultural and Food Sciences
- Soil Management and Crop Yield
- Food Drying and Modeling
- Leaf Properties and Growth Measurement
- Genetics and Plant Breeding
- Spectroscopy and Chemometric Analyses
- Growth and nutrition in plants
- Horticultural and Viticultural Research
- Greenhouse Technology and Climate Control
- Sugarcane Cultivation and Processing
- Soil Carbon and Nitrogen Dynamics
- Forest ecology and management
- Heavy metals in environment
- Weed Control and Herbicide Applications
- Irrigation Practices and Water Management
- Natural Products and Biological Research
- Agronomic Practices and Intercropping Systems
- Soil Geostatistics and Mapping
- Plant Physiology and Cultivation Studies
- Soil erosion and sediment transport
- Agricultural Innovations and Practices
- Plant Micronutrient Interactions and Effects
- Sensory Analysis and Statistical Methods
- Berry genetics and cultivation research
- Chromium effects and bioremediation
Universidade Federal de Lavras
2019-2024
Universidade Federal Rural do Rio de Janeiro
2023
ABSTRACT: Assessing sugarcane (Saccharum spp.) stalk growth helps to adequately manage the phenological stages of crop. The aim this study was describe height-growth curve four varieties (RB92579, RB93509, RB931530 and SP79-1011), in irrigated plant-cane ratoon cane plantations, using Logistic Gompertz nonlinear models, while considering all deviations from assumptions. model parameters were estimated based on least squares method Gauss-Newton algorithm. To select most suitable model,...
Abstract ‘Green Dwarf’ coconut is a fruit of great economic interest, since all its components are used, in addition to water, main component. It culture humid tropics, widely produced northeastern Brazil, being an important income source for the region. The phenology study this type extremely important, but there few studies literature. Regression models, especially nonlinear growth can be value understand how behaves. scarcity works nature may linked some difficulties estimating parameters...
Brazil has stood out worldwide as one of the main producers and consumers beans, which makes their cultivation important for economic social development country. As bean plant a short growth cycle, its modeling is essential optimizing management plans this crop. This can be performed by linear non-linear models, but latter have providing more information to researcher, mainly due practical interpretation parameters. In sense, in R statistical software, third-degree polynomial model Logistic...
Abstract The aim of this study was to describe the growth curve “Aurora 1” peaches using fruit height and diameter data over time through diphasic sigmoidal models constructed from eight combinations following models: Brody, Gompertz Logistic. Data were obtained an experiment carried out in 2005 municipality Vista Alegre do Alto, São Paulo, Brazil. parameters adjusted by least squares method Gauss-Newton algorithm implemented R software. Assumptions normality, homogeneity independence...
A porcentagem acumulada de germinação sementes Brachiaria brizantha tem um comportamento caracterizado por modelo sigmoidal, o qual é bem ajustado através modelos não lineares. Sendo assim, objetivo deste estudo foi avaliar a qualidade do ajuste dos lineares Logístico, Gompertz, von Bertalanffy e Brody na descrição utilizando-se os métodos superação dormência (H2SO4 KNO3) temperatura 20-35ºC. Os dados utilizados foram provenientes experimento conduzido no ano 2008. Com base nos avaliadores...
O Milho-pipoca, também conhecido simplesmente como milho de pipoca, é uma variedade (Zea mays) cultivada especificamente para a produção sua vem crescendo forma significativa nos últimos anos. Objetivou-se nesse estudo descrever cinética secagem grãos milho-pipoca na temperatura 40°C com teor umidade inicial 0,175 e 0,235 b.s, comparando os modelos regressão Lewis, Henderson Pabis, Page Midilli e, obtendo Taxa Secagem Absoluta (TSA) o melhor modelo. A estimação dos parâmetros foi...
Various elements have the potential to negatively impact crops in agricultural sector, such as presence of weeds that compete for essential resources, hindering growth and production resulting financial losses. There are several methods employed weed control, among which herbicides stand out requiring less labor lower costs compared others, especially large-scale cultivation. The objective this study was use nonlinear models assess dose-response curve herbicide trifloxysulfuron-sodium...
No mundo existem várias espécies de plantas daninhas conhecidas, dentre elas, encontram-se como do gênero Amaranthus . Produzem muitas sementes que se disseminam facilmente e rapidamente, podem competir por água, luz nutrientes prejudicando as culturas na qual convivem. O estudo crescimento desse tipo planta possibilita uma análise sua interferência contribuição para o desenvolvimento técnicas manejo. Neste sentido, os modelos não lineares Gompertz foram ajustados, meio software R, aos dados...
Abstract Jabuticaba tree is native to the Atlantic Forest in Southern Brazil, and its fruit widely consumed fresh form, but it highly perishable, requiring conservation techniques. The aim of this study was describe drying kinetics jabuticaba pulp at temperatures 50 60°C, comparing Henderson, Simple Three-Parameter Exponential, Lewis, Thompson, Fick Wang Sing regression models estimating Absolute Drying Rate (ADR) for best model. Parameters were estimated using SAS software. evaluation...
O Brasil se destaca mundialmente pelo plantio de florestas homogêneas, principalmente pinus e eucalipto. A produção florestal tem grande importância para economia do país, sendo também uma referência em sustentabilidade, competitividade inovação. Dos 10 milhões hectares árvores plantadas, 76,3% dessa área é composta gênero Eucalyptus, o que torna um dos maiores produtores mundo desse gênero. estudo da trajetória crescimento pode ser aliado no melhoramento planos manejo atualmente utilizados....
Brazil stands out in the renewable energy sector due to growing demand for clean sources, mainly with biodiesel production, which uses vegetable oils and animal fats as raw material.With this, research has been developed oilseed plants this purpose and, among these plants, Jatropha stood its productivity ability grow regions water scarcity.Thus, it is necessary study growth of plant over time assist management techniques detection factors that affect development.Therefore, modeling type can...
An economic and environmentally feasible way to recycle sewage sludge is its use in agriculture.Information on carbon mineralization curves allows us seek improvements soil quality andcrop productivity. The objective of this work was evaluate the nonlinear models that describecarbon soil. experiment conducted laboratory design wascompletely randomized, with four replicates three treatments. following treatments wereevaluated: sludge, black oat straw + straw, incorporated into soil.Pots...
Agricultural management is a viable way for recycling animal residues in feedlots. Thesubstances that make up organic change the dynamics of matter decompositionin soil. Information on carbon mineralization curves allows seeking improvements soil qualityand, consequently, crop productivity. The Stanford & Smith Nonlinear Model most usedto describe C This model considers residuesare composed substances are mineralized exponentially. Cabrera twofractions, one exponentially and other ofmore...
One of the strategies to reduce environmental impacts caused by pig slurry is its application soils for agricultural productions. Carbon mineralization curves can be used determine best periods use organic matter an adequate management and growing plants. The objective this study was evaluate fit nonlinear models soil carbon mineralization. experiment conducted using a randomized block design with four replications treatments. treatments consisted monthly applications at rates 0, 7.5, 15.0,...
A method capable of reducing the environmental damage caused by swine manure and soil enrichment with nutrients is based on use these residues together crops straw in soils for agricultural production. Through carbon mineralization curves, it possible to determine best intervals organic matter from better adapt crops. Dynamics present can help selection management. The objective this study was compare fit three nonlinear models that describe carbonmineralization over time, addition assessing...
As plantas daninhas são motivo de preocupação aos agricultores, pois infestam áreas agrícolas e podem causar grandes prejuízos, por demandarem gastos com métodos controle, além poderem prejudicar a produção. Estudar o crescimento desse tipo planta permite conhecimento em relação seu comportamento no ambiente que se desenvolve pode auxiliar desenvolvimento formas adequadas sustentáveis manejo. Neste sentido os modelos não lineares Logístico von Bertalanffy foram ajustados, meio do software R,...
Corn is the most produced cereal in world, used both human and animal nutrition. This study aimed to compare fit of Logistic, Gompertz, von Bertalanffy non-linear models data on accumulation total dry mass, mass stems, leaves, ears corn plants grown with straw mulch from common bean, millet, Brachiaria brizantha relation days after plant emergence. The assumptions normality, homoscedasticity, independence residuals were checked by Shapiro-Wilk, Breusch-Pagan, Durbin-Watson tests,...
ABSTRACT: When modeling growth curves, it should be considered that longitudinal data may show residual autocorrelation, and, if this characteristic is not considered, the results and inferences compromised. The Bayesian approach, which considers priori information about studied phenomenon has been shown to efficient in estimating parameters. However, as generally possible obtain marginal distributions analytically, necessary use some method, such weighted resampling generate samples of...
ABSTRACT: Coffee crops play an important role in Brazilian agriculture, with a high level of social and economic participation resulting from the jobs created supply chain income obtained by producers revenue generated for country coffee bean export. In plant growth, leaves have determinant higher production; therefore, leaf count per provides relevant information to adequate crop management, such as foliar fertilizer applications. To describe data, Poisson model is most commonly employed...
Zinc uptake is essential for crop development; thus, knowledge about soil zinc availability fundamental fertilization in periods of higher demand. A nonlinear first-order kinetic model has been employed to evaluate availability. Studies usually employ few observations; however, inference models only valid sufficiently large samples. An alternative the Bayesian method, where inferences are made terms probability, which effective even with small The aim this study was use methodology fitness a...
Litter is an important source of nutrients for trees and can improve the quality degraded soils. The objective this study was to describe dynamics carbon mineralization in litter soils using nonlinear models, estimating half-life times. Soil under three types forest cover evaluated: Atlantic fragment (capoeira), Acacia auriculiformis (acacia), Mimosa caesalpiniifolia (sabiá) from a reforested area with history degradation. Twelve measurements mineralized were made up 222 days after beginning...
Objective: To use the non-linear regression models (Lewis, Overhults, Page, Midilli, and Three-parameter simple Exponential) to describe drying kinetics of bean seeds as a function time (hours). Theoretical Structure: The research project shows steps taken conduct analyze data. Method: model parameters were estimated using least squares method Gauss-Newton convergence algorithm. assumptions normality, homoscedasticity, independence residuals tested Shapiro-Wilk, Breuch-Pagan, Durbin-Watson...
For residues maintained on the soil surface, microbial colonization of substrate is slower initially due to population's adaptation phase substrate. Subsequently, decomposition becomes more intense easily mineralizable matter, and as process progresses, there a predominance resistant materials that can reduce attack. Thus, maximum rate CO2 release occurs in early days decomposition, this described by Gompertz model, which nonlinear sigmoidal regression model. The theory for models valid...
O objetivo do trabalho foi estudar e avaliar a curva de crescimento pêssegos “Aurora 1”, com base em dados altura diâmetro fruto, avaliados ao longo tempo por modelos não lineares duplo sigmoidais Brody, Gompertz Logístico generalizados. Os utilizados no estudo foram extraídos um experimento conduzido 2005, município Vista Alegre Alto, Estado São Paulo, Brasil. parâmetros dos estimados pelo método mínimos quadrados, algoritmo Gauss-Newton executado meio software R. As pressuposições...