NPK nutrition of container-grownGrevillea rosmarinifolia

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Abstract
G. rosmarinifolia plants were grown in planterbags containing 1:1, vol/vol, peat:perlite, supplied with slow release and short-term nursery fertilizers. Plants responded strongly to 450g N/m3 but foliage growth was depressed if 300g P/m3 was also added. At high levels of N, P and K, the foliar N levels were nearly 2.5 times greater than with low levels of each; high P fertilization doubled the levels of foliar P and increased foliar N, K and Na. Proteoid root numbers per plant were heavily reduced by high N or P fertilization, especially at high NP or PK levels. Plants supplied with medium levels of added N and low levels of P and K will grow strongly despite the partial or total absence of proteoid root production.