Nutrient Concentrations of Healthy Seedlings and Transplants of Picea sitchensis and Other Conifers Grown in English Forest Nurseries

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Abstract
Concentrations of N, P, K, Mg, Ca, Mn were determined in whole-plant samples of healthy one-year seedlings and one-plus-one transplants of Picea sitchensis, Picea abies, Abies grandis, Tsuga heterophylla , and of seedlings only of Pinus nigra var. maritima . The samples were taken at the end of each of three consecutive growing seasons from plants grown in nursery beds on several contrasted soils in south-east England. Tops and roots were analysed separately in the last of the three years. The sampling formed part of a large experimental programme on nutrition problems in forest nurseries, and most of the data are supported by evidence from past detailed experiments. N, P, Ca concentrations in Picea abies tended to be larger than in Picea sitchensis , and K concentrations smaller. Concentrations of all nutrients, except Mg, were larger in tops than in roots, those of N, P, and K larger in seedlings than in transplants. With few exceptions our analytical data agree well with those published elsewhere, either for nursery-grown trees or for trees raised in culture experiments, but there is not yet sufficient evidence that these nutrient ranges have any general validity.

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