Supplemental irrigation levels in bell pepper under shade mesh and in open-field: Crop coefficient, yield, fruit quality and water productivity

Abstract

This study aims to evaluate the effects of supplemental irrigation in bell pepper crop under shade mesh and in open-field to improve management of water resources. The experimental design was a randomized complete block with four replications and ten treatments in factorial arrangement (five irrigation levels combined with two shade levels). Irrigation treatments were 0.25, 0.50, 0.75 and 1.0 rate of crop evapotranspiration and the control (no supplemental irrigation). Shading treatments were 0 and 50% reduction of photosynthetically active radiation, compared to open field conditions. Crop coefficient was influenced by rainfall, especially during initial growth stage period when it was high and Kc values were 0.71, 1.17, and 0.92. Treatments under shade and open-field had no significant interaction effect, alike between the years of study. The yield in open-field and under shade mesh showed better performance in 0.75 and 0.50 of ETc, respectively. Maximum water productivity and irrigation water productivity was obtained in open-field and deficit irrigation plots. Under shade, highest fruit quality was obtained; heavier fruits, less dry matter, no sunscald and increasing value added to production. Comparing water consumption in open-field and shading, it can be obtained up to 14 to 25% water saving, significantly improving yield and fruit quality.

Influence of Deficit Irrigation on Biometric Parameters of Capsicum Crop under Polyhouse Conditions

“…The plant height in the 0.75 ET C (T2) drip irrigation was almost equal to the 1.0 ET C (27.79 cm) 30 and 90 DAT drip irrigation. The results obtained are compatible with the findings published by [11], which indicates that constant availability of soil moisture in the root zone is conducive to improved nutrient intake, and aeration in turn improve plant height.…”

“…The higher level of irrigation and fertilizer application, which made plants to respond in production of early flowering, fruit set again, helped in obtaining the highest fruit yield per hectare. Parallel results are observed with [11,14] for Capsicum crop. To compare polyhouse capsicum crop yield with open field, capsicum plants cannot survive during the off-season due to severe hot weather conditions in the open field.…”

Engenharia: a máquina que constrói o futuro

“…Observa-se que a lâmina de água de irrigação L4 (120% da ETo) proporcionou as maiores médias ao longo de todas as avaliações, demonstrando que o maior fornecimento de água foi benéfico ao desenvolvimento da planta. Observa-se ainda que as lâminas de 100% e 60% apresentaram desempenho semelhante e não diferiram entre si da lâmina de 80% conforme observado por Padrón et al (2015) que não verificaram diferenças significativas no diâmetro do caule de pimentão ao avaliar lâminas de reposição da ETo de 100, 80 e 60%.…”

“…De acordo com Padrón et al (2015) a cultura do pimentão irrigada com uma maior frequência tende a ser mais eficiente quanto ao uso da água, sem afetar seu rendimento, comparado a um cultivo irrigado com menor frequência. Dessa forma, a adoção de manejo de irrigação mais frequentes com a lâmina de irrigação deficitária podem ser utilizados para a produção de pimentão vermelho nas regiões semiáridas em épocas de baixa disponibilidade hídrica.…”

Níveis de irrigação associados a doses de hidrogel na cultura do pimentão

“…Com relação à eficiência de uso da água, os resultados são condizentes aos obtidos por Souza et al (2019), ao verificarem melhor aproveitamento da água no nível de irrigação de 160,45 mm (60% ETc), em comparação à lâmina de 320,9 mm (120% ETc). Padrón et al (2015b) também observaram um declínio na eficiência do uso da água com um aumento nos níveis de irrigação. Aragão et al (2012) obteve maior eficiência de uso da água de 21,36 kg mm -1 ha -1 , fazendo reposição de 50% da ECA.…”