Abstract
The effect of different eradicating agents used in nursery practice on the contents of nitrogen, phosphorus, potassium, calcium, and magnesium in needle tissue of coniferous tree seedlings was investigated. Jack pine (P. banksiana) and Monterey pine (P. radiata) were raised in nursery seed beds and greenhouse pot cultures on soils treated with biocides used singly and in combinations at different rates of application. The biocides investigated included aluminum sulfate, calomel, formaldehyde, thiosan, allyl alcohol, Stoddard oil, benzene hexachloride, and chlordane. Responses of the seedlings ranged from a stimulation of growth and an increase in the content of nutrients to a severe depression of the rate of growth accompanied by a reduction in the content of nutrients. The results of the study indicate that tissue analysis may serve as a useful tool in determining the effect of eradicating agents on the availability of nutrient elements to tree seedlings.
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