Effect of cultivation season and selected sorbents on the yield and nitrate content of butterhead lettuce (Lactuca sativa L. var. capitata L.)
2005
Majkowska-Gadomska, J.,University of Warmia and Mazury, Olsztyn (Poland). Dept. of Horticulture
A study undertaken to investigate lettuce cultivation in a non-heated foil tunnel in two cycles: spring (43 days) and autumn (36 days). The experimental material included butterhead lettuce var. Charlene and sorbents: potassium ecosorb, sodium-, potassium, and sodium-potassium acrygels, added to the subsoil used for the production of seedlings. Four objects were analysed. The subsoil without sorbent addition served as the control. Each year, the total yield of lettuce and nitrate content of its leaves were determined after harvest. A beneficial effect of spring cultivation and soil supplementation with sorbents, especially potassium acrygel, on the yield of lettuce var. Charlene was demonstrated. Lettuce cultivated in both experimental cycles was found to be differentiated in terms of nitrate contents. Lettuce from the spring harvest was characterized by a significantly lower content of nitrates, compared to that from the autumn harvest. Sorbents introduced to the subsoil did not contribute to the statistically confirmed increase in nitrate content, compared to the control. The application of autumn cultivation and sodium acrygel was observed to have a significant effect on nitrate content of lettuce leaves
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