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

Publisher Website
Google Scholar
Abstract
Phosphorus applications ranging from 0 to 288 kg P/ha were broadcast alone and in combination with band treatments of 22 kg P/ha to two newlycleared Kempsville sandy loam (Typic Hapludults) soils for the purpose of measuring corn (Zea mays L.) yield responses and obtaining soil test calibration data. Four to 10‐fold corn grain yield increases resulted from P additions. 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 two sites of 31 and 42, 29 and 37, 18 and 19, and 47 and 43 ppm were 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 two 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.