Summary
Different growing conditions of early lettuces were assayed. Some plots of lettuces were grown covered with a perforated plastic sheet, and other plots were not covered. The soil of some plots was fertilized with a usual N+P+K+S fertilizer used at a normal rate, and the soil of other plots with a fertilizer containing only nitrogen at a rate about 40 times lower than the normal one for N. The total carotenes (provitamin A) contents of the ripe lettuces were measured. Covering with a plastic sheet always decreased the total carotenes contents. The N+P+K+S fertilizer used at normal rate increased, relatively to the nitrogen fertilizer lacking of P+K+S and used at low rate, the total carotenes contents of the non-covered lettuces, but had no or low effect on the total carotenes contents of the covered lettuces.
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Rouchaud, J., Moons, C., Meyer, J.A. et al. Effects of soil fertilization and covering of the culture with plastic film on the provitamin A content of early lettuces. Plant Soil 80, 139–141 (1984). https://doi.org/10.1007/BF02232948
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DOI: https://doi.org/10.1007/BF02232948