A Series of laboratory and greenhouse experiment were conducted to
evaluate ferrihydrite product and they effects on growth and some chemical
composition of wheat plants. Results were noticed that, infrared examination indicated
that decreasing level of silica gave a weak band at 860 em-' particularly at 0.125.
However higher silica content gave a lower degree of polymerization as indicating by
a reduction in band intensity at 800cm-' and enhancement at 760cm·'. Micro structural
views of ferrihydrite showed the best developed of the crystal particularly when Si I Fe
ratio increased. Successive extraction of Fe with DTPA showed that, cumulative
amounts of Fe extracted from the ferrihydrite products were ranged between 17.5 and
44.2% for Fe- 0.125 Si and Fe-1.0 Si respectively, indicating that poorly crystalline
materials had a supplying power for Fe status particularly in calcareous soils.
Application of Fe- 0.5 Si and Fe-1.0 Si to the soil stimulate the yield production (grain
and straw) of wheat plant as compared with other treatments. Increasing levels of Fe
from 25 to 100 mglkg gradually increased the yield production. Ferrihydrite products
added to the soil gave a remarkable effects on Fe and N uptake. Results also showed
that, increasing ratio of Fe I Si had a positive effect for both Fe and N uptake as well
as total content. Total chlorophyll content were gradually increased with ferrihydrite
addition. It evident that poorly crystalline materials had a good scope of residual
effects which seems to substantial the slow release properties of these was
immobilized.