Sulfur fertilization for polyethylene-mulched cabbage

Anas D. Susila, Salvadore J. Locascio


Cabbage (Brassica oleracea L. Capitata) was grown with polyethylene mulch and drip irrigation on an Arredondo fine sandy soil testing very high in P and low in organic matter (0.9% to 1.6%) in four seasons to evaluate the effect of S rate and methods of application on yield and nutrient concentrations. Experiments were conducted with S rates of 0, 34, 68, and 102 kg ha1 from ammonium sulfate with two methods of application: preplant (100% broadcast in the bed) and drip (40% preplant and 60% injected). In each of four field studies, cabbage total yields were influenced by S application. Maximum cabbage yields were obtained with application of S at 34kg-ha-1. An interaction between method of application and S rate was significant for total yield. With 40% S applied preplant and 60% drip applied, cabbage yield was higher than with 100% S applied preplant. Leaf S concentrations were higher with S application than with no S application and were similar with S applications from 34 to 102 kgha1. Soil-extractable SO4 increased linearly, and soil pH decreased « 0.2 units at 6 and 9 weeks after transplanting with an increase in S rate.

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Proc. Fla. State Hort. Soc.     ISSN 0886-7283