Use of dolomite phosphate rock (DPR) fertilizers to reduce phosphorus leaching from sandy soil.
There is increasing concern over P leaching from sandy soils applied with water-soluble P fertilizers. Laboratory column leaching experiments were conducted to evaluate P leaching from a typical acidic sandy soil in Florida amended with DPR fertilizers developed from dolomite phosphate rock (DPR) and N-Viro soil. Ten leaching events were carried out at an interval of 7 days, with a total leaching volume of 1,183 mm equivalent to the mean annual rainfall of this region during the period of 2001-2003. Leachates were collected and analyzed for total P and inorganic P. Phosphorus in the leachate was dominantly reactive, accounting for 67.7-99.9% of total P leached. Phosphorus leaching loss mainly occurred in the first three leaching events, accounting for 62.0-98.8% of the total P leached over the whole period. The percentage of P leached (in the total P added) from the soil amended with water-soluble P fertilizer was higher than those receiving the DPR fertilizers. The former was up to 96.6%, whereas the latter ranged from 0.3% to 3.8%. These results indicate that the use of N-Viro-based DPR fertilizers can reduce P leaching from sandy soils.
Chen
G C
GC
Department of Natural Resource Science, College of Environmental and Resource Sciences, Huajiachi Campus, Zhejiang University, Hangzhou 310029, China.
He
Z L
ZL
Stoffella
P J
PJ
Yang
X E
XE
Yu
S
S
Calvert
D
D
D002119:Calcium Carbonate; D004781:Environmental Exposure / Q000009:adverse effects; D005308:Fertilizers; D006863:Hydrogen-Ion Concentration; D008274:Magnesium; D010710:Phosphates; D010758:Phosphorus / Q000032:analysis* / Q000737:chemistry; D011891:Rain; D012987:Soil / Q000032:analysis*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000032:analysis*
D005308:Fertilizers; D010710:Phosphates; D012987:Soil; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D002119:Calcium Carbonate; D008274:Magnesium; C028042:calcium magnesium carbonate