INFLUENCE OF ORGANIC ACIDS IN AMELIORATION OF IRON (Fe) CHLOROSIS IN GROUNDNUT (Arachis hypogaea L.)
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Date
2016
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Acharya N.G. Ranga Agricultural University
Abstract
A potculture experiment was conducted in Agricultural College, Bapatla,
Andhra Pradesh to study the‘Influence of organic acids in amelioration of iron
(Fe) chlorosis in groundnut (Arachis hypogaea L.)" during kharif season of 2015-
16. The experimental soil was calcareous (collected from Vertisol profile),
alkaline in reaction, low in organic carbon, available nitrogen, medium in
available phosphorus and high in available potassium. All the micronutrients
except iron were sufficient in the soil with values above their critical limits. The
treatments comprised of control (T1); FeSO4.7H2O @ 0.25% (T2); citric acid @
0.25% (T3); acetic acid @ 0.25% (T4); oxalic acid @ 0.125% (T5); ascorbic acid
@ 0.25% (T6); hydroxyl amine hydrochloride (T7) were replicated thrice in
completely randomized design (CRD) with three replications. Foliar application
of organic acids were applied to the respective pots immediately after noticing the
iron chlorosis, peg penetration and pod formation stage of the crop growth. Entire
phosphorus was applied as basal dose in the form of single super phosphate,
nitrogen and potassium were applied in 3 and 2 splits, respectively in the form of
urea and muriate of potash as per the recommended dose of fertilizer. The
influence of various treatments on iron chlorosis, soil properties and growth and
yield of groundnut were determined by standard procedures at different growth
stages.
Among the treatments imposed organic acids treated pots resulted in
significantly lower pH at different stages of the crop growth. The treatments
imposed had no significant effect on EC, soil organic carbon and CEC, but slight
increment was noticed in organic acids treated pots over control.
Foliar application of organic acids showed non significant difference in N,
P, K and significantly increased the S and Fe contents in soil. Availability of N, K
nutrients was maximum in treatments treated with ascorbic acid @ 0.25%, P was
higher in treatments received oxalic acid @ 0.125% and S, Fe contents in soil
were higher in treatment supplied with FeSO4.7H2O @ 0.25% were found
significantly superior to rest of the treatments.
Foliar application of organic acids showed not significant influence on the
soil enzyme activity. urease, acid, alkaline phosphatase and dehydrogenase
activities were higher in organic acids received treatments than that of control.
Foliar application of organic acids favoured the growth, yield and its
attributes, was recorded highest in treatment that received with FeSO4.7H2O @
0.25% besides increase in the content of N and K in plant was observed in
treatment supplied with ascorbic acid @ 0.25%, but highest P content was
observed in oxalic acid @ 0.125% treated pots. The results further showed that S,
Fe, and chlorophyll ‘a’ & ‘b’ contents was higher in the treatment that received
FeSO4.7H2O @ 0.25% and significantly superior to rest of the treatments. Uptake
of N, P, K, S and Fe was found to be higher in FeSO4.7H2O @ 0.25% (T2)
imposed treatment, which was at par and followed by treatment supplied with
citric acid @ 0.25% (T3), significantly superior to control.
Description
D5298
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