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Abstract
Intermittent misting of celery plants grown in nutrient solutions resulted in higher top and sucker fresh weights and a lower percentage of dry matter. Misting reduced transpiration up to 27% but did not affection uptake nor the incidence of blackheart.
Total top and sucker fresh weights generally decreased with increasing Ca/K ratio in the nutrient solutions while percentage dry matter increased. The 50ppm Ca/235 ppm K ratio resulted in a high water-use efficiency while the 200/59 ratio resulted in a low efficiency. Blackheart symptoms decreased with increasing Ca/K ratio.
Osmotic concentrations of 0.3 and 4.8 atm. in the nutrient solutions decreased both the fresh and dry weights of tops but increased the percent dry matter as compared to the 1.2 atm. nutrient solution. Water-use efficiency was lower at the 0.3 than at the 1.2 and 4.8 atm. concentrations. Blackheart was most severe in the 1.2 atm. solutions.