Eduardo Carvalho Oliveira

Viabilidade técnica e econômica da produção de ervilha (Pisum sativum L.) cultivada sob diferentes lâminas de irrigação

This work had the aim to verify the technical and economic feasibility of pea (Pisum satiums L.) yield under different irrigation depth levels, cultivated in greenhouse. It was used a completely randomized design (CRD), with five levels of replacement of water irrigation (50%, 75%, 100%, 125% and 150% of field capacity) with four replications. The crop was drip irrigated when the average soil water tension obtained from the tensiometers installed in the treatment of 100% was equivalent to 15 kPa. The results were affected by drought and water excess for total production of the plant and for number of beans for plant. The maximum productivity obtained was equal to 4,197 kg ha-1 for a water depth of 188.4 mm and the economic great irrigation depth was 187.4 mm; the greatest water use efficiency was 27.23 kg ha1 mm-1 for a water depth of 86.25 mm.

Efeito do déficit hídrico em duas fases fenológicas sobre a produção do pepino-japonês cultivado em ambiente protegido

The experiment was performed in the experimental area of the Engineering Department Federal University of Lavras, Minas Gerais State, Brazil. It aimed at identifying the adequate irrigation management of the greenhouse-cultivated Japanese cucumber (Cucumis sativus L.). complete randomized design, with four levels of soil water potential (15; 30; 60 e 120 kPa) at two phenological phases (vegetative and reproductive), and 5 replications. Overall, the results showed decrease of yield according to increase of soil water potentials. During the reproductive stage, Japanese cucumber plants were more sensitive to water deficit, resulting in further decrease in yield compared to applied water deficit during the vegetative stage of the culture.

Análise produtiva e econômica do pimentão-vermelho irrigado com diferentes lâminas, cultivado em ambiente protegido

The irrigation management is not only an important factor to supply plants water needs, but also to minimize problems with diseases, nutrient leaching as well as unnecessary expenses with water and energy. This study had the aim to verify the economic feasibility of red bell pepper (Capsicum annuum, L.) yield under different irrigation depths, cultivated in greenhouse. A completely randomized design (CRD) was used, with five levels of replacement of irrigation water (50, 75, 100, 125 and 150%) with four replications. Significant differences were found for number of fruits per plant and total production of the plant. The maximum productivity obtained was equal to 35,300 kg ha-1 for a water depth of 443.9 mm and the optimum economic irrigation water depth was 443.5 mm; higher economic returns are obtained by keeping the crop with a water content near field capacity, restoring the full amount of water consumed. The highest water use efficiency was 74.76 kg ha 1 mm-1 for a water depth of 334.1 mm.

Evapotranspiração da roseira cultivada em ambiente protegido

The objective of this study was to determine the evapotranspiration and crop coefficient for the cut rose (cv. Carola) cultivated in protected environment and the coefficient of small tank installed inside the greenhouse during the period of one year. Five rows of plants were planted with spacing of 1.20 m between rows and 0.20 m between plants. Each line consisted of five plots with five plants per plot. Plants of the second and fourth rows and of the second and fourth plots were installed in four drainage lysimeters with dimensions of 1.20 x 1.20 x 0.80 m. The plants of the remaining plots were considered as border plants. A drip irrigation system was used. An automatic weather station was installed in the greenhouse and the data were collected and stored daily at an interval of one hour in a data-logger. The crop coefficient (Kc) showed mean values of 0.75 in the vegetative phase and 1.18 during the productive phase. The small pan (tank) coefficient (Ktr) was 0.72.

Análise produtiva e econômica do pepino japonês submetido a diferentes lâminas de irrigação

This study had the aim to verify the economic feasibility of japanese cucumber (Cucumis sativus L.) yield under different irrigation depths, cultivated in greenhouse. A completely randomized design (CRD), with five levels of replacement of irrigation water (50, 75, 100, 125 and 150%) and six replications was used. The results showed that the number and fruit weight of crop were affected by treatments of water deficit and excess used for treatments. The maximum productivity obtained was equal to 45,944 kg ha-1 for a depth of 320 mm and the economic optimum irrigation depth was estimated at 319.5 mm, concluding that for the japanese cucumber higher economic returns are obtained by keeping the crop with soil water content near field capacity, restoring the full amount of water consumed.

Manejo de irrigação para o feijão-de-metro, nas fases vegetativa e produtiva, em ambiente protegido

Proper irrigation water management requires knowledge on each exploited crop; particularly regarding vegetative and productive phases since many species have critical periods during which water stress causes serious yield reductions. This study was undertaken so as to assess the effect of five matric potential levels on asparagus bean growth and yield. The experiment was conducted under greenhouse conditions at the experimental area of Department of Engineering, Federal University of Lavras, Lavras, MG. The experimental design was randomized blocks in factorial 5 x 2. The treatments consisted of five matric potentials as indicative of the irrigation scheduling -15 -35 -55 -75 -95 kPa and at two phenological stages (vegetative and reproductive) as monitored by sensors installed at 0.15 m depth. The results allowed to conclude that the most sensitive phase to water deficit was the productive, and that irrigation held at matric potential around -15 kPa led to better crop response in the development, production and quality of pods.

Produção da ervilha cultivada em ambiente protegido sob diferentes tensões de água no solo

Os efeitos de diferentes tensoes de agua no solo aplicadas em dois estadios fenologicos da cultura da ervilha (Pisum sativum L.) foram avaliados por meio de dois experimentos, ambos conduzidos em delineamento experimental inteiramente casualizado com quatro tratamentos e quatro repeticoes. Os tratamentos se constituiram de quatro diferentes tensoes de agua no solo: 15, 30, 60 e 120 kPa. Os resultados permitiram concluir que diferencas significativas foram encontradas para producao total da planta, numero de vagens por planta e para peso medio da vagem, independentemente da fase fenologica em que foi aplicado o tratamento de tensao de agua no solo; maiores quedas de producao foram observadas na fase reprodutiva, demonstrando que esta fase e mais sensivel a escassez de agua no solo, prejudicando o desenvolvimento da cultura; obtiveram-se maiores producoes com irrigacao realizada sob a tensao de 15 kPa.

ANÁLISE TÉCNICA E ECONÔMICA DA IRRIGAÇÃO DO FEIJÃO-DE-METRO EM AMBIENTE PROTEGIDO

O experimento foi conduzido em Lavras-MG, e teve como objetivo avaliar, tecnica e economicamente, o efeito de diferentes lâminas de irrigacao aplicadas por gotejamento na produtividade do feijao-de-metro. O delineamento experimental foi em blocos casualizados, com cinco tratamentos e quatro repeticoes. Os tratamentos constituiram-se de cinco lâminas de irrigacao por gotejamento, sendo: 40; 70; 100; 130 e 160 % da lâmina de reposicao de agua ate a capacidade de campo. As lâminas de agua que maximizam a produtividade e o retorno economico foram obtidas a partir do modelo de regressao em funcao de dados de produtividade, das relacoes de preco do produto e do custo da agua. A viabilidade economica foi obtida com base na relacao beneficio/custo. A lâmina de maximo retorno economico foi estimada em 431,3 mm, com uma produtividade de 35.156,6 kg ha-1, que e viavel economicamente para o cultivo do feijao-de-metro, com uma rentabilidade esperada de R

FUNÇÃO DE PRODUÇÃO PARA A ROSEIRA CULTIVADA EM SISTEMA DE PRODUÇÃO INTEGRADA

1,7 para cada real investido.

Germination and early growth of physic nut submitted to levels of salinity

Roses are the main exploitation in floriculture in Brazil. The lack of information on the quantity of water applied along the phenological development stages of the plants, as well as defcient or excessive nutrient application to the plants may provide unfavorable conditions for rosebush development. This study aimed to make a technical and economical evaluation for rose production in terms of irrigation and nitrogen. The experiment was conducted in a greenhouse and consisted of a randomized block design with split plots. These plots were defned by four irrigation depths (40, 70, 100 and 130%) and the subplots by four recommended nitrogen levels rate for rosebushes (40, 70, 100 and 130%), with four replications. The irrigation management was performed with tensiometers installed at the experimental treatments of 100% irrigation depths. Rose productivity decreased due to water defcit or excess; nitrogen rates did not affect the qualitative parameters of the buds; the irrigation depth that provided the maximum economic and technical effciencies were nearly identical.