Abstract
Abstract The effects of varying phosphorus (P) and sulphur (S) supply on the dry matter production, height growth, foliage type, nutrient content and nutrient composition of blackwood seedlings were examined in a fractional, factorial experiment with 12 levels each of P and S in 29 treatments. Regressions of final height at age 6 months, and seedling dry weight respectively on P and S supply level gave quadratic response surfaces with maxima occurring at the combinations P15.1 S12.7 and P15.8 S14.6 (where P1 S1 = a total dose of 5 mg each of P and S). This result suggests that requirement for s is closely comparable to that for P in blackwood seedlings. Interaction (P × s) was not significant for any variable. At harvest, seedlings grown with the P‐S treatment combination closest to the predicted optimum supply for maximum productivity had concentrations of 2.7% N, 0.23% P, and 0.16% S in their tops, or 2.4% N, 0.20% P. and 0.17% S in the whole seedling. These seedlings were well proportioned with a tops:...
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