Abstract
PERENNIAL rye-grass was sown in small pots (12 cm. in diameter) on August 3, and harvested on October 22, 1947. Seven plants per pot were grown, and six replicate pots per treatment were provided. Two top soils from North Auckland Province, both very poor in available phosphate, were used. The Maunu loam derived from basalt is akin to a lateritic type; the Wharekohe silt loam, derived from an early tertiary claystone, is a mature podsol. They are classified respectively as "immature red brown loam" and "strongly podsolized yellow earth" by the New Zealand Soil Survey. Primary calcium phosphate labelled with radioactive phosphorus was used as fertilizer in amounts equivalent to 100 mgm. P2O5 per pot, this being roughly equal to a rate of 100 kgm. P2O5 per hectare, calculated on an area basis. Dry-matter yields, total phosphorus and radioactivity were determined in the harvested plants.
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STRZEMIESKI, K. Soil Phosphate Uptake as Influenced by Phosphatic Fertilizer. Nature 162, 932 (1948). https://doi.org/10.1038/162932a0
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DOI: https://doi.org/10.1038/162932a0
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