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Phosphorus Bioavailability following Incorporation of Green Manure Crops

^a USDA-ARS, Sustainable Agricultural Systems Lab., Henry A. Wallace Beltsville Agricultural Research Center, Bldg. 001, Rm 140, 10300 Baltimore Ave., Beltsville, MD 20770
^b Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506

View larger version (23K): [in a new window]   Fig. 1. (A) Changes in Bray-1 soil P during perennial forage green manure crop growth (Day 0 to Day 59) and decomposition (Day 59 to Day 91) and during growth of a succeeding sorghum crop (Day 91 to Day 129) (n = 8 replicates for Days 0 and 59; n = 4 for Days 91 and 129). (B) Changes in Bray-1 soil P during winter cover crop green manure growth (Day 0 to Day 38) and decomposition (Day 38 to Day 77) and during growth of a succeeding sorghum crop (Day 77 to Day 117) (n = 8 replicates for Days 0 and 38; n = 4 for Days 77 and 117). Values are adjusted means, and error bars are ± 1 SE, determined using repeated measures analysis.