Response of bell pepper to water replacement levels and irrigation times

Abstract

Different irrigation times result in variable transpiration rates, due to the water availability and its interaction with the evapotranspiration demand. The vapor pressure deficit is an accurate indicator of the atmosfere evaporative capacity and can affect plants because of the movement of water in the soil-plant-atmosphere continuum system. This study aimed to evaluate the plant growth, yield and water-use efficiency of bell peppers under irrigation times (8 a.m. and 2 p.m.) and water replacement levels (60 %, 80 %, 100 %, 120 % and 140 % of the crop water requirement - ETc) based on the evapotranspiration demand. The increase in the irrigation levels could be fit to linear models for the variables number of fruits per plant, mean and total fruit weight per plant, fruit length, and root, stem and total dry weight. Irrigation at 2 p.m. increased the total and mean fruit weight and number of fruits per plant, as well as fruit length, if compared to the irrigation at 8 a.m., besides increasing the yield by 50.82 % (2,343.0 g plant-1 to 3,533.6 g plant-1) and the water-use efficiency by 55.64 %. In areas subjected to water shortages, establishing irrigation times based on irrigation management practices can increase the water-use efficiency and yield for bell peppers.

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.…”

Modeling Short-term Yield Changes in Sweet Pepper Based on Dry Matter Production and Fruit Growth

“…The presented model may indicate underpredictions when plants are grown with severe environmental conditions. For example, the growth of sweet pepper is generally hampered under severe conditions, such as high and low temperatures, lack of irrigation, and high and low EC in a nutrient solution (Bosland and Votava 2012;de Souza et al 2019;Erickson and Markhart 2002;Tadesse et al 1999). Therefore, the range of environmental variables presented in this study is the premise for the robustness of the proposed model.…”

Modelagem do crescimento do pimentão em diferentes regimes hídricos

“…Em outros estudos, a demanda hídrica do pimentão até os 98 DAT foi de 267,42 mm, considerando a reposição de água referente a lâmina de 100 % ETc (SOUZA et al, 2019). Tais resultados obtidos por Souza et al (2019) foram semelhantes ao encontrado nesta pesquisa, considerando a mesma lâmina aplicada de 100% ETc.…”