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Phosphorus application to newly-cleared coastal plain soils: corn (Zea mays L.) response and soil test calibration data



Phosphorus application to newly-cleared coastal plain soils: corn (Zea mays L.) response and soil test calibration data



Communications in Soil Science and Plant Analysis 14(4): 335-346



P applications ranging from 0-288 kg P/ha were broadcast alone and in combination with band treatments of 22 kg P/ha to 2 newly-cleared Kempsville sandy loam (Typic Hapludults) soils for the purpose of measuring corn (Z. mays L.) yield responses and obtaining soil test calibration data. Grain yield increased 4 to 10-fold. Broadcast applications of 96 kg P/ha in combination with band treatments of 22 kg P/ha from either diammonium phosphate or ammonium polyphosphate were most efficient in increasing corn grain yields to 80% or more of maximum yield. Critical extractable soil P values for the 2 sites of 31 and 42, 29 and 37, 18 and 19, and 47 and 43 ppm wre obtained for the Bray I, North Carolina (NC), Olsen, and Mehlich III soil test procedures, respectively. Increases in extractable soil P with increasing P applications expressed as ppm P/kg P applied varied for the 2 sites from 0.21 to 0.26 for the Bray I and NC procedures, 0.10 to 0.13 for the Olsen method, and 0.23 to 0.35 with the Mehlich III test.

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Accession: 001108439

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DOI: 10.1080/00103628309367368


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