Efficacy of silicon and potassium in the amelioration of iron in rice culture
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Date
2000
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Department of Agronomy, College of Horticulture, Vellanikkara
Abstract
The study entitled "Efficacy of silicon and potassium In the
amelioration of iron in rice culture" was carried out during virippu and mundakan
seasons of 1999-2000 at Agricultural Research Station, Mannuthy, with the
objective to evaluate the efficacy of silicon and potassium in ameliorating the
stress influences of excess iron on rice productivity in laterite soils as well as to
characterise their influences on growth and yield of rice.
Combined application of sources and levels of silica with levels of K
increased the grain yield by 1000 kg ha" over control. Among the three sources of
silica sodium silicate recorded the highest grain yield of 6644 kg ha" followed by
fine silica (6282 kg ha') and rice husk (6113 kg ha').
Increasing the level of K application to 52.5 and 70 kg ha", as against
the package of practices recommendation of 35 kg K ha', increased the grain yield
by 951 and 1125 kg ha', respectively. The yield of straw significantly varied
among the sources and levels of silica and levels of K and sodium silicate recorded
the highest yield of 4128 kg ha".
Content and uptake of Fe showed a decreasing trend from panicle
initiation to flowering stage where as an increasing trend was noted in respect of
Si02 due to the general treatment effect.
Three factor interaction effect showed that the treatment receivmg
500 kg Si ha" as sodium silicate in combination with 70 kg K ha" recorded the
highest yield 0[7306 kg ha" and it also recorded reduced contents of Fe and Mn at
panicle initiation and Fe at flowering.
During rabi season the residual effect of general treatments increased
the grain yield by 571 and 358 kg ha' in the absence and presence of applied
potash.
Iron and Manganese content was reduced at different growth stages by
the residual effect of sodium silicate during rabi season. The residual effect of
500 kg Si ha" was found to enhance the content of Si02 throughout the growth
period but it failed to improve the yield.
From the study it could be concluded that the increased yield was
generally associated with reduced contents of Fe and Mn which suggest that these
nutrients limit the produ,ctivity of rice in laterite soils and application of silica and
higher levels of potash was found to ameliorate the limiting influences of Fe and
Mn, enabling increased rice productivity.
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