Calcium efficiency among tomato strains depends on nitrogen regimes 1 |
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Authors: | Jean E. English Allen V. Barker |
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Affiliation: | 1. Department of Plant and Soil Sciences , Massachusetts Agricultural Experiment Station , Amherst, Massachusetts, 01003;2. Robinson Substation , Quicksand, KY, 41363 |
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Abstract: | Two Ca‐efficient and 3 Ca‐inefficient tomato strains were grown for 18 days in nutrient solutions with NH4‐N:NO3‐N ratios (%) of 0:100, 50:50, or 90:10 and with 40 mg of total Ca++. When NH4‐N nutrition was used, efficient strains exhibited Ca‐deficiency symptoms sooner or produced less dry matter than inefficient strains. The greatest reductions in dry weight production occurred between 50 and 90% NH4‐N nutrition. The greatest reduction in solution pH and in % of Ca in plant tissues occurred between 0 and 50% NH4‐N nutrition. Ratings of Ca efficiency varied according to the proportion of NH4‐N in the nutrient solutions. |
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Keywords: | Nutrient efficiency Lycopersicon spp. acid soil tolerance |
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