Effects of carbon dioxide enrichment on growth, development and yield of glasshouse tomatoes. I. Responses to controlled concentrations

Publisher Website
Google Scholar
Abstract
Responses of November-sown tomatoes to controlled C02 concentrations of 600, 1000 and 1400 vpm, together with a non-enriched (ambient) treatment, were investigated. The experiment also included three nitrogen treatments, namely 133, 200 and 267 ppm of N in the liquid fertilizer applications with a potash level of 400 ppm K2O common to each. The experiment was designed to evaluate the separate eifects of the above treatments applied in the pre-planting and post-planting periods. Similar patterns of response to the CO2 concentration treatments resulted from both pre-planting and post-planting enrichment, though post-planting applications had the larger effect on total crop yield and monetary value. Significant and large increases resulted with CO2 concentration increments up to 1000 vpm but further increases with 1400 vpm were generally not significant. The maintenance of a three-fold enrichment level throughout the entire enrichment period is therefore recommended. There was some indication that high nitrogen before planting and low nitrogen after were the best treatments. However, since the general level of response was quite small it should prove commercially acceptable to apply a nitrogen level of 200 ppm throughout.

This publication has 0 references indexed in Scilit: