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Knowledge of the speed of infiltration of water into the soil is of fundamental importance to define the methods of soil conservation, planning and design of irrigation systems and drainage. In order to study the speed of infiltration of water into a OxiLatossoil, before the system management tillage applying different empirical models, this work was conducted Centro de Ciências Agrárias, at the Federal University of Alagoas (CECA - UFAL), in order to evaluate the behavior of the equations of Kostiakov, Kostiakov-Lewis and Horton which Were used to estimate the Water infiltration rate in studied soil by using simple the soil under study, using a simple ring to evaluate the infiltration of water in the field. It was then that the system on the equation that more fit the model of the simple ring infiltrometer was to Kostiakov followed the model of Horton.

The study aimed to: assess the effects of plant densities in the behavior of genotypes of maize; Select the genotypes of greater adjustment and grain yield and better density of planting in the municipality of Rio Largo-AL. It was evaluated the genotypes: UFAL-1, UFAL-4, UFAL-5, UFAL-7, Sertanejo, Cruzeta and AL-30, and the densities: 55,555, 66,666, 77,777 and 88,888 plants.ha-1. Used randomized block design scheme in a split plot with three replicates. The plots (4 rows 18mx0, 9m) was formed by genotypes and the subplots (4.5 mx0 ranks, 9m) by densities, with one plant per pit. It was determined the variables: plant height and insertion of the 1st spike, the stem diameter, ear size and number of rows of grain in ear, index of ears and yield. The density of planting of 55,555 plants.ha-1 improved performance in the variables, plant height, diameter of the stem, size of the ear, index of spike and grain yield in genotypes; Genotypes AL-30 and UFAL-4 outperformed the others in grain yield; Low correlation of the variables studied with the yield; Lack of water during the flowering to maturity of the grains meant that the genotypes expressing its full potential.

The study propagation of non-cultivated plants aims the species domestication, and its propagation can be carried out by seeds. However exist factors that affect the germination, among them there are the size, the weight of seed and the use of chemical substances. The present work was carried out with the objective to evaluate the influence of the weight of seeds and chemical promoters on the seed germination of Hyptis pectinata. It was used seeds collected and classified of sambacaitá in blower machine, which had been placed to germinate on Petri dishes, and kept in germination chamber at 27ºC under constant light. The experimental design was the completely randomized in factorial scheme 2x4, referring two chemical seeds classification llow and heavy seeds) and three substances (GA3, KNO3 and PEG) and the control, with four replications of 50 seeds each. The variables analized were percentage, speed germination index and mean square for time of germination. The statistical analysis was carried out using the software Sanest, and the average values compared by the Test of Tukey 5%. The different classification of seeds by weight present influence on the physiological quality of sambacaitá's seeds. Heavy seeds germinate in higher percentage, and faster speed, and short time. The chemical treatment with KNO3 and GA3 increases the germination percentage, but for the speed germination index and germination do not present significant difference. The use of PEG increases the mean square time of germination of sambacaitá's seeds.

Com o objetivo de obter equações que, através de parâmetros lineares dimensionais das folhas, permitisse a estimativa da área foliar de juazeiro, estudaram-se relações entre a área foliar real e parâmetros dimensionais do limbo foliar, como o comprimento ao longo da nervura principal (C) e a largura máxima (L), perpendicular à nervura principal. As equações lineares simples, polinomiais e potencias obtida podem ser usadas para estimação da área foliar. Do ponto de vista prático, sugere-se optar pela equação linear simples envolvendo o produto C x L, considerando o coeficiente linear igual a zero, a qual apresentou a menor Soma de Quadrados do Resíduo. Desse modo, a estimativa da área foliar de juazeiro pode ser feita pela fórmula AF = 0,7931 x (C x L), que equivale a tomar, 79,31% do produto entre o comprimento ao longo da nervura principal e a largura máxima, com um coeficiente de correlação de 0,9937.

The occurrence of the Utetheisa ornatrix (L., 1758) is registered for the first time attacking Crotalaria spp. in Rio Largo country (12°40' S, 39°06' W, 127 m de altitude), Alagoas State, Brazil.