Phytoavailability and extractability of potassium, magnesium and manganese in calcareous soil amended with olive oil wastewater.
Gallardo-Lara, F.; Azcon, M.; Polo, A.;
Journal of Environmental Science and Health. Part B, Pesticides, Food Contaminants, and Agricultural Wastes Year: 2000 Vol: 35 Issue: 5 Pages: 623-643 Ref: 54 ref.
2000
บทคัดย่อ
A pot experiment using calcareous soil was performed in a growth chamber to examine the effects of olive oil waste water on the availability and postharvest soil extractability of K, Mg and Mn. The experiment included 6 treatments: two rates of olive oil waste water, two mineral fertilizer treatments containing K (which supplied K in amounts equivalent to the K supplied by the olive oil waste water treatments), a K-free mineral fertilizer treatment, and a control. The pots were sown with ryegrass as the test plant, harvesting 3 times at intervals of one month. Olive oil waste water has demonstrated a considerable capacity for supplying K that can be assimilated by the plant, tending to surpass the mineral potassium fertilizer tested. The application of olive oil waste water reduced the concentration of Mg in the plant, similarly to the effect of adding mineral potassium fertilizer. An enhancement of Mn availability takes place in the soil amended with olive oil waste water, which occasionally pr
oduces Mn concentrations in plant that are phytotoxic. After harvesting an increase was noted in the amount of exchangeable K in the soil with added industrial waste water. These increases are lower than those in soil treated with mineral potassium fertilizer. The levels of exchangeable, carbonate-bound, organic-bound and residual Mg in soil were higher in treatments incorporating olive oil waste water than in those with added mineral K, with the opposite tendency occurring in the amount of Fe-Mn oxides-bound Mg in soil. Treatments based on olive oil waste water, especially in high doses, increased the amount of exchangeable and carbonate-bound Mn in soil, in comparison with treatments adding mineral fertilizers with or without K. In contrast, the addition of industrial waste water caused a drop in the amount of Fe-Mn oxides-bound and organic-bound Mn in soil.