Time filter

Source Type

Almería, Spain

Medrano E.,IFAPA Research Institute | Alonso F.J.,IFAPA Research Institute | Sanchez-Guerrero M.C.,IFAPA Research Institute | Primaflor P.L.,IFAPA Research Institute | And 2 more authors.
Acta Horticulturae | Year: 2012

In strawberry soilless culture, an accurate and dynamic control of water supply is needed to meet plant water requirements, due to the limited volume of the root environment. A greenhouse experiment was carried out to improve the irrigation control on strawberries (Fragaria × ananassa Duch. 'Festival') in a semiclosed hydroponic system. A transpiration model was proposed to estimate water uptake based on climate parameters and leaf area development. Plant transpiration, measured by a weighing lysimeter, solar radiation and water vapor pressure deficit (VPD) inside the greenhouse were recorded throughout the crop cycle. A good shortterm (10 min) prediction of the plant water uptake was obtained by adjusting the coefficients of the model in two stages differentiated in time (before and after 90 days after transplanting). An estimation of the leaf area index (LAI) as a function of Days After Transplanting (DAT) was also obtained. This study shows the possible implementation of these models in the irrigation control systems to synchronize water supply and plant requirements to improve irrigation management. Source

Alonso F.J.,IFAPA Research Institute | Lorenzo P.,IFAPA Research Institute | Medrano E.,IFAPA Research Institute | Sanchez-Guerrero M.C.,IFAPA Research Institute
Acta Horticulturae | Year: 2012

Crop techniques as training pruning that modify the source/sink ratio of assimilates, might change the plant response to a CO2 increase. In this work, it was evaluated the productive response of a greenhouse sweet pepper (Capsicum annuum L.) crop to a CO2 supply strategy linked to ventilation, and the influence of the number of stems per plant on this response. Carbon dioxide enrichment modified the dry matter vegetative/ generative ratio only through the enhancement of the generative fraction. Vegetative parameters as LAI and SLA were not modified under elevated CO 2 conditions. Both higher CO2 concentration and higher number of stems per plant increased yield but the interaction was not significant. Source

Discover hidden collaborations