THE B STATUS OF TOMATO PLANTS AND THEIR PEAT-BASED SUBSTRATE
Boron accumulation can occur in peat-based substrates from the use of water containing 2 mg/liter or more B. The effects of excess levels of B in peat-vermiculite growing media on the leaf composition and crop yield of tomato plants were studied in three separate greenhouse trials. In Trial #1 three levels of B and in Trial #2 three levels of Zn were applied at 1:3:9 ratios with 3 replications to the substrates. In Trial #3 substrate and tomato leaf samples submitted periodically for testing purpose to Rutgers University Soil Testing Laboratory by growers were investigated. To a degree, the samples used in the three trials reflected a diversity in the B status of such substrates. The extractable levels of B, Ca, K, Mg, P, NO3-N, and NH4-N were determined in all substrate samples. The total concentrations of the above nutrients were analyzed in all leaf tissue samples. In addition, the DTPA extractable Zn in the substrate and total Zn in the leaves were determined in all samples of Trial #2. Calcium and Zn primarily, but also N, K, Mg, and P were evaluated as potential factors for reducing B toxicity in plants. Correlation coefficients are presented.
Markus, D.K. (1988). THE B STATUS OF TOMATO PLANTS AND THEIR PEAT-BASED SUBSTRATE. Acta Hortic. 221, 235-244