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Abstract
Tomatoes (Lycopersicon esculentum Mill.) were grown for two seasons on polyethylene‐mulched beds to evaluate metam‐potassium (metam‐K) as both a fumigant and K source in comparison to metam‐sodium (metam‐Na) fumigant and KCl fertilizer applied preplant or injected. Treatments without fumigation had significantly lower early yield compared to treatments with metam‐Na at 468 or 935 L ha‐1 or metam‐K at 281 L ha‐1 in 1993. There were no significant differences in early yield for 1994. No by‐year interaction for total yield were noted so results were combined for both years. Tomatoes grown with metam‐Na at 468 L ha‐1 produced significantly higher yields than all the other treatments. The leaf K concentration in 1993 was 34 g kg‐1 with metam‐K at 561 L ha‐1 which was greater than treatments with Kcl. However, metam‐K showed little advantage in performance over metam‐Na as a fumigant or KCl as a fertilizer source.
Notes
Alabama Agriculture Experiment Station Publication No. 11–955123.