USE OF EXOGENOUS COMPOUNDS AND CROP RESIDUE FOR SALINITY TOLERANCE OF MAIZE
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Date
2018
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Acharya N.G. Ranga Agricultural University
Abstract
A green house experiment entitled “Use of exogenous compounds and crop
residues for salinity tolerance of maize” was conducted during kharif, 2017 at
Agricultural College, Bapatla to study the influence of application of exogenous
compounds (humic acid / proline / KNO3) and maize residues (raw / compost) on
performance of maize, osmoregulation in plants and soil properties. The experiment
was conducted in CRD (Completely randomized design ) with thirteen treatments viz.,
T1: 100% RDFN, T2 : 125% RDFN, T3: 100% RDFN + extra 25% RDN through raw
residue, T4: 100% RDFN + extra 25% RDN through compost and their combination
treatments T5 : T2+ humic acid foliar spray @ 0.2% at 20 and 40 DAS, T6 : T2 +
Proline foliar spray@ 50 mM L-1
at 20 and 40 DAS, T7 : T2 + KNO3 foliar spray @ 10
g L-1
at 20 and 40 DAS, T8 :.T3 + Humic acid foliar spray @ 0.2% at 20 and 40 DAS,
T9: T3 + Proline foliar spray@ 50 mM L-1 at 20 and 40 DAS, T10 : T3+ KNO3 foliar
spray @ 10 g L-1
at 20 and 40 DAS, T11 : T4+ humic acid foliar spray @ 0.2% at 20 and
40 DAS, T12 : T4+ Proline foliar spray @ 50 mM L-1
at 20 and 40 DAS, T13 : T4+
KNO3 foliar spray@ 10 g L-1
at 20 and 40 DAS with three replications.
The experiment was conducted on a saline soil with ECe 6.8 dS m-1, slightly
alkaline reaction, medium organic carbon, low available nitrogen, medium available
phosphorus, high available potassium and sulphur and deficient zinc content. Raw
maize residue and its compost were added to the respective treatments considering their
nitrogen content. Plant and soil samples collected at different stages were analyzed
following standard procedures.
Use of exogenous compounds (humic acid / proline / KNO3) and maize crop
residues (raw / compost) exhibited a significant influence on plant height, grain and
stover yield. Addition of 25% extra nitrogen as compost along with foliar spray of
KNO3 resulted in the highest plant height and yield followed by its supply with proline
foliar spray. The same treatment combinations were found to be superior in maintaining
high chlorophyll, RWC, proline, total sugars and required ionic ratios of leaves when
compared to raw residue and inorganic treatments alone or in combination with foliar
sprays.
Supplementation of 25% extra nitrogen through crop residues improved the
water holding capacity of saline soil at harvest significantly. The organic carbon
content and nutrient content (except potassium at harvest) were found to be
significantly influenced by the addition of crop residues either raw or composted at all
the crop growth stages. High bacteria, fungi and actinomycetes population and
dehydrogenase enzyme activity were observed due to addition of 25% extra nitrogen in
the form of either raw or composted maize residue.
In general, the treatments supplied with compost performed better in
maintaining overall soil health in saline soils. Foliar sprays of exogenous compounds
resulted in improved plant performance with no much effect on soil except the
microbial population.
Description
D5659
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