Effects of nitrogen form, nutrient concentration and Ca concentration on the growth, yield and fruit quality in NFT-tomato plants

Hohjo, M.; Kuwata, C.; Yoshikawa, K.; Ito, T.

Acta Horticulturae 396: 145-152


ISSN/ISBN: 0567-7572
Accession: 002608532

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The tomato cv. Momotaro was grown using the nutrient film technique (NFT) in 1/2- and 3/4- to full-strength Enshi-shoho balanced feed. In the first experiment, nutrient solutions were adjusted to contain NO3-N:NH4-N ratios of 10:0, 9:1 and 8:2. Shoot and root FW were increased by an increasing proportion of NH4-N with both strengths of solution, whereas Ca and Mg uptake were decreased by an increasing proportion of NH4-N only with the higher solution strength. Total yield was reduced by increasing the proportion of NH4-N, particularly with the higher strength of solution, a combination that also caused a marked increase in the incidence of blossom-end rot (BER). In the second experiment, NO3-N:NH4-N ratios of 10:0 and 8:2 and Ca concentrations of 2, 4 and 6 meq/litre were used. The higher proportion of NH4-N significantly increased shoot and root FW, incidence of BER and leaf contents of N, P and K, whilst decreasing the leaf content of Ca. Increasing the Ca content of the medium caused an increase in early yield and leaf Ca content, and a decrease in BER and leaf Mg content. The combination of 8:2 NO3-N:NH4-N and the lowest Ca concentration reduced total yield and leaf Ca content and significantly increased BER.