Adão Wagner Pêgo Evangelista

Produtividade e rendimento de sementes de pinhão-manso submetido à irrigação e adubação com OMM-Tech

The purpose of this study was to evaluate the effects of irrigation and application of Organo-Minerals-Marine+Biotech (OMM-Tech) in yield and production efficiency of the Jatropha curcas. The experiment was conducted in an experimental area located in Federal University of Lavras, Brazil. A randomized block design with subdivided parcels and three replications was used. The parcels were submitted to different OMM-Tech fertilizer application methods: T1= control (no OMM-Tech); T2 = soil application (120 kg ha-1 of OMM-Tech in a powder form); T3 = leaf application (OMM-Tech in a liquid form with a 5% concentration); T4 = soil + leaf application (60 kg ha-1 of OMM-Tech as powder + OMM-Tech in liquid form with a 2.5% concentration). The sub-plots received two different water management treatments: with and without irrigation. A drip irrigation system with emitters spaced by 0.50 m was used. It was evaluated productivity and production efficiency of seeds in the first yield year. The plants irrigated and fertilized with 120 kg ha-1 of OMM-Tech solid in soil showed better productivity.

Distribuição, probabilidade de ocorrência e período de retorno dos índices de erosividade EI30 e KE>25 em Seropédica - RJ

O presente trabalho foi desenvolvido com o objetivo de estudar as caracteristicas da erosividade da chuva em Seropedica (RJ), quanto a sua distribuicao, probabilidade de ocorrencia e periodo de retorno. Para isso, foi utilizada uma serie mensal de dados pluviometricos referente ao periodo de 1973 a 2002 e, com o auxilio de modelos ajustados para a regiao, foi possivel obter os indices mensais e anuais de erosividade EI30 e KE>25. Com base nos resultados obtidos, foi possivel concluir que: a) os valores medios anuais de EI30 e de KE>25 foram de 5.960,4 MJ mm ha-1 h-1 e de 99,2 MJ ha-1, respectivamente, e estao associados a periodos de retorno de 1,97 ano, com uma probabilidade de ocorrencia de 50,82%; e b) valores anuais de EI30 da ordem de 5.995; 7.262; 7.684; 7.895; 8.022 e 8.064 MJ mm ha-1 h-1 e de KE>25 da ordem de 99,8; 122,7; 130,3; 134,1; 136,4 e 137,1 MJ ha-1, sao esperados, em media, uma vez a cada 2; 5; 10; 20; 50 e 100 anos, respectivamente.

Citrus root distribution under water stress grown in sandy soil of central Florida

O experimento foi conduzido na Universidade da Florida (Centro de Ensino e Pesquisa em Citrus), em Lake Alfred, Polk County, Florida-EUA. O objetivo deste estudo foi avaliar os efeitos do estresse hidrico na distribuicao de raizes de laranjeira Valencia enxertada em citrumelo Swingle, em um pomar de 11 anos de implantacao. Tres tratamentos foram aplicados: 1) plantas irrigadas por microaspersao no periodo seco (Nov-Mar); 2) plantas nao irrigadas no periodo seco, e 3) plantas nao irrigadas no periodo seco e tambem sem chuva no periodo umido. As plantas do tratamento 3 nao receberam chuva durante o periodo umido, e os tratamentos 1 e 2 receberam chuva normalmente durantes 3 anos consecutivos (2003-2006). A irrigacao normal foi recomecada em todos os tratamentos, em meados de marco. Amostras de raizes foram coletadas utilizando um trado de boca (0,09 m de diâmetro e 0,25 m de altura) nos dois lados da linha de plantio, em 3 distâncias horizontais do tronco da planta (1, 2 e 3 m) e 4 profundidades (0,0-0,15; 0,15-0,30; 0,3-0,60 e 0,6-0,9 m). Os resultados mostraram que uma significante diferenca na distribuicao de raizes entre as plantas irrigadas e nao irrigadas.

Potencial de água no solo em diferentes estádios fenológicos do cafeeiro irrigado por pivô central

Irrigation management can be established, considering the soil water potential, as the limiting factor for plant growth, assuming the soil water content between the field capacity and the permanent wilting point as available water for crops. Thus, the aim of this study was to establish the soil water potential interval during four different phenological phases of coffee irrigated by center pivot. The experiment was set at the experimental area of the Engineering Department at the Federal University of Lavras, in Brazil. The coffee variety planted is designated as Rubi, planted 0.8 meters apart, with rows spaced 3.5 meters apart. The treatments corresponded to the water depths applied based on different percentages of Kc and reference evapotranspiration (ET0) values. Sensors were used to measure the soil water potential interval, installed 25 centimeters depth. In order to compare the results, it was considered as the best matric potential the one that was balanced with the soil water content that resulted in the largest coffee productivity. Based on the obtained results, we verified that in the phases of fruit expansion and ripening, the best results were obtained, before the irrigations, when the soil water potential values reached -35 and -38 kPa, respectively. And in the flowering, small green and fruit expansion phases, when the values reached -31 and -32 kPa, respectively.

ATRIBUTOS FÍSICOS E BALANÇO HÍDRICO DO SOLO COM FLORESTA OMBRÓFILA MISTA, EM LATOSSOLO VERMELHO-AMARELO, EM TELÊMACO BORBA - PR

The objective of this study was to characterize the soil physical and hydric attributes and quantify, in one year, the water balance components, carried out for Native Ombrophylous Forest, in an OXISOL, sandy texture, in Telemaco Borba - PR state. The experiment was held at Monte Alegre Farm, which belongs to the company Klabin Florestal, the area was under native forest in an advanced state of regeneration. The following physical and hydric attributes were characterized: bulk density, saturated hydraulic conductivity, soil water retention curve, aeration porosity and total available water ( TAW ). The undisturbed samples were collected in a trench, in five depths. The disturbed samples were collected weekly, in eight different points inside the experiment area, in five depths. The values of soil moisture and internal precipitation were collected and registered throughout the year. The soil water storage was calculated using the trapezoidal rule. The internal drainage and capillary rise were estimated by using the Darcy-Buckingham equation. The values of the bulk density, micro, macro and total porosity of the soil are classified in the range considered adequate for soils with sandy texture. The soil presented a high hydraulic conductivity, which is a characteristic of well drained soils. In average, the storage did not reach the permanent wilting point throughout the year. The average deep drainage was bigger throughout the months with more precipitation, the value being an average of 94.9 mm year –1 . The average value of the real evapotranspiration was 1355.9 mm year - 1 , an average of 3.7 mm day - 1 .

AFRICAN MAHOGANY SUBMITTED TO DRIP IRRIGATION AND FERTILIZATION

1 Received on 22.01.2015 accepted for publication on 11.11.2016. 2 Universidade Federal de Goiás, Escola de Agronomia, Goiânia, GO Brasil. E-mail: <jose.junior@pesquisador.cnpq.br>. 3 Universidade Federal de Goiás, mestre em Agronomia, Goiânia, Goiás Brasil. E-mail: <luishantunes@hotmail.com> and <flaviodeoliveirarosa@gmail.com>. 4 Universidade Federal de Goiás, Escola de Agronomia, Goiânia, GO Brasil. E-mail<awpego@pesquisador.cnpq.br>. 5 Universidade Federal do Recôncavo da Bahia, Centro de Ciências Agrárias, Ambientais e Biológicas, Cruz das Almas, BA Brasil. E-mail: <lucasvellame@gmail.com>. *Corresponding author.

ELEMENTOS INTERFERENTES NA QUALIDADE DA ÁGUA PARA IRRIGAÇÃO

For the development of agriculture in the world, water is a natural resource of greater relevance, since new technologies to increase productivity of agricultural areas are dependent on their availability. This importance is reflected in the high productivity of irrigated areas, where only 18% of the total agricultural areas account for approximately 40% of global agricultural production. The objective of this study was, by means of a literature review, evaluate and discuss some of the main types of water used and attributes that can affect the quality of water for irrigation. It was concluded that the use of lower quality water, such as wastewater or stillage, is an alternative to meet the high demand for water in relation to low supply. But for this, one must have a knowledge of the main attributes that pose interfere with the quality of water for irrigation, and