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Sugarcane Response to Phosphorus Fertilizer on Everglades Histosols
Author(s) -
McCray J. Mabry,
Rice Ronald W.,
Luo Yigang,
Ji Shangning
Publication year - 2010
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj2010.0046
Subject(s) - histosol , fertilizer , cane , phosphorus , saccharum , agronomy , soil water , crop , yield (engineering) , environmental science , zoology , chemistry , soil organic matter , biology , sugar , soil science , materials science , organic chemistry , soil biodiversity , metallurgy , biochemistry
Determining sugarcane ( Saccharum spp.) yield response to P fertilizer supports the development of agricultural best management practices consistent with Everglades restoration efforts. Field studies were conducted on organic soils to determine sugarcane yield responses to P fertilizer. Four test sites were established on Florida Histosols (water‐extractable P = 1.3, 1.7, 2.1, and 9.0 g P m −3 ) with annual banded rates of 0, 9, 18, 36, 72, and 144 kg P ha −1 There were a total of 13 crop years with duration of each test ranging from 2 to 4 yr. Linear and quadratic regression and single degree of freedom contrasts were used to determine P fertilizer requirements. There were responses in t cane ha −1 (TCH) and t sucrose ha −1 (TSH) to P fertilizer application at four and three sites, respectively. Annual fertilizer P requirement at the four sites ranged from 18 to 33 kg P ha −1 , with no consistent change in P requirement across crop years. Based on measured response (95% of maximum yield) in TCH and TSH up to 33 kg P ha −1 , the maximum P recommendation for sugarcane grown on Florida Histosols should be maintained at 36 kg P ha −1 Minimal reductions in sucrose concentration (kg sucrose t −1 cane) were measured at P rates ≤36 kg P ha −1 Water‐extractable P did not predict the measured yield response at all sites, demonstrating the need for an updated soil test calibration that should be applicable over a wide pH range and include both quickly available and reserve soil P.