Fátima Conceição Rezende

Vegetative growth and yield of eggplant under different soil water tensions.

Os efeitos de diferentes tensoes de agua no solo aplicadas em dois estadios fenologicos da cultura da berinjela (Solanum melongena L.) foram avaliados por meio de dois experimentos, ambos conduzidos em um delineamento experimental inteiramente casualizado com 5 tratamentos e 6 repeticoes. Os tratamentos se constituiram de 5 diferentes tensoes de agua no solo: 15, 30, 45, 60 e 80 kPa. Os resultados permitiram concluir que efeitos significativos foram encontrados para todas as variaveis analisadas apenas quando os tratamentos foram aplicados na fase de formacao de frutos/colheita, 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.

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.

Produtividade e potencial hídrico foliar do cafeeiro Catuaí, em função da época de irrigação

This work evaluated the effect of different periods of irrigation (A - between 06/01 and 09/30; B - between 09/01 and 09/30; C (control) - without irrigation), on productivity, grain yield and leaf water potential of the coffee crop cultivar (Coffea arabica L), cv. Catuai - Red (IAC 44). The experiment was carried out in 18 years old coffee crop, with 3.5 m of distance between lines of plants and 0.8 m between plants. The leaf water potential was evaluated between 0600 and 1200 hrs, in the period from May until October for the years 2003 and 2004. The high sensitivity of this physiological indicator to irrigation was identified, and that the irrigation from 06/01 to 09/30 (treatment A) always showed the best leaf water status, as well as the best performance of productivity, with a mean value of 4617 kg ha-1. The results corroborate with the fact that the productivity of the crop maintained a direct relationship with its leaf water status and especially with the leaf water potential, which showed itself to be a physiological indicator with good discriminating powers, and for this reason, suitable to be utilized as a reference in the irrigation management.

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.

Rendimento da pimenta cayenne em função de diferentes tensões de água no solo

This study aimed to evaluate the effect of different soil water tensions at different phenological stages (vegetative and reproductive) on Cayenne pepper cultivated in greenhouse and with drip irrigation. A completely randomized design was used, using four soil water tensions (20, 40, 60 e 120 kPa) as treatments with four replications, in two experiments (1 e 2), related to the phenological stages (vegetative and reproductive), respectively. The higher values of fruits mean weight per plant were obtained with 20 kPa soil water tension, being 1,936.83 and 2,091.59 g plant-1 and the yield coefficients obtained were 0.81 and 1.01, for vegetative and reproductive stages, respectively. It was concluded that the crop yield presented inversely proportional behavior to the soil water tension, and the 20 kPa tension showed most appropriate to promote the irrigation on the studied stages. The yield coefficients identified the reproductive stage as the most sensitive to the water stress.

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.