Studies on Ferrous Sulphate and Zinc Sulphate Application on Yield and Quality of Byadgi Chillies in Calcareous Vertosol of Northern Transitional Zone of Karnataka
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Date
2013
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Publisher
UAS, Dharwad
Abstract
A field experiment was conducted during kharif 2012 in the farmer’s field at Agadi
village in Dharwad district to study the “Response of Byadgi chillies to ferrous sulphate and
zinc sulphate application in calcareous Vertisol in northern transitional zone of Karnataka”.
The experiment consisted of ten treatments with three replications. Results showed that
application of ferrous sulphate @ 25 kg ha-1 to soil on 30th DAT+foliar spray of 0.5 percent
ferrous sulphate on 60th and 90th DAT recorded highest fruit yield (17.17 q/ha) closely
followed by treatment that received soil + foliar application of zinc sulphate (16.60 q/ha).
Ferrous sulphate applied treatments recorded comparatively higher fruit yield than zinc
sulphate applied treatments. Highest colour value (274.23 ASTA units) and oleoresin content
(18.07%) in red chillies were recorded with soil (25 kg/ha)+foliar (0.5%) application of
ferrous sulphate. Foliar spray of zinc sulphate (0.5%) on 60th and 90th DAT produced
minimum per cent discoloured fruits (5.26%) and treatments receiving only ferrous sulphate
application recorded comparatively higher discoloured fruits than treatments receiving zinc
sulphate application (T3 and T5). Control recorded maximum per cent discoloured fruits
(6.12%). Combined foliar spray of ferrous sulphate and zinc sulphate (each 0.5%) at 60 and
90 DAT resulted in marginal decreased colour value (230.11 ASTA units) but numerical
increase in discoloured fruits (5.54%) compared to individual foliar spray. Highest iron
(196.63 mg/kg) and zinc (86.59 mg/kg) contents in red fruits were noticed in treatments
receiving soil+foliar application of ferrous sulphate (T6) and zinc sulphate (T7) respectively.
Potassium content of whole red fruits had a significant positive correlation with colour value
(0.79**) and oleoresin content (0.81**). Iron and zinc contents of whole red fruits were
positively correlated with colour value (0.65* and 0.63* for iron and zinc, respectively). Zinc
content of whole red fruit possessed significant negative relationship with per cent
discoloured fruits (-0.84**). Per cent discoloured fruits possessed significant positive
relationship with leaf nitrogen content (0.66*), while potassium, iron and zinc contents
possessed significant negative relationship. Highest B:C ratio (5.31) was obtained due to soil
+ foliar application of ferrous sulphate (T6).