Efecto del azufre elemental sobre el pH y la solubilidad de algunos nutrimentos en fosfocomposts

Translated title of the contribution: The effect of elementary sulphur on the pH and solubility of some nutrients in phosphocomposts

Ángel E. Marcano C*, Julio C. Rodríguez, Mohammad Mohsin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The effect of addition of elementary sulphur (S°) on the pH and solubility of some plant nutrients was studied in fosfocomposts prepared with 1 kg water hyacinth (Eichhornia crassipes), 800 g cow manure, 200 g phosphate rock (RF) and 5 g sulphate acid soil, using Thiobacillus sp bacteria as inoculum. 0, 5, 10, 15 and 20 g of S° per 2 kg of composts were applied with two replicates each and a control without RF nor S°. After a 6 month incubation, soluble P, Mg, Ca, Fe, Cu, Mu, Su, NO3-, NH4+ and SO42-, pH, and C/N ratio were determined, as were total content of each metal and P, N, S and C. The percentages of total P and Ca were higher in the phosphocomposts than in the control, while the concentrations of N, K, Mg, Fe, Cu, Mn and Zn were higher than in the control (p<0.001). The lowest pH value was found in the phosphocompost with highest quantity of S°. A significant correlation exists between pH and SO42; the relation increases with a decrease in pH affecting negatively the decomposition of organic matter and resulting in lower soluble NO3-, P and K. A positive association was found between NO3- and pH. Ca, NH 4+, Fe, and Mn were more soluble with increasing acidity. Soluble Zn and Mg varied significantly among the composts without relation to pH. More soluble Ca with high S° was an indication of a higher dissolution of the added RF. However, available P diminished in the phosphocomposts with acid pH, possibly due to its immobilization with Fe and the low decomposition of the organic matter.

Translated title of the contributionThe effect of elementary sulphur on the pH and solubility of some nutrients in phosphocomposts
Original languageSpanish
Pages (from-to)504-511+555
JournalInterciencia
Volume28
Issue number9
StatePublished - Sep 2003
Externally publishedYes

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