CHARACTERIZATION OF BLACK SOILS OF MUDHOL TALUKA FOR ITS FERTILITY
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Date
2015-07
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University of Horticultural Sciences, Bagalkot
Abstract
A soil survey was conducted to characterize black soils of Mudhol taluka of
Bagalkot district irrigated with different water sources and different cropping systems
for their fertility aspects in.
All the soils studied were calcareous in nature with high CaCO3 content. The
pH of soils ranged from slightly alkaline to high alkalinity and it varied significantly
with and without irrigations. The electrical conductivity (ECe) also differed
significantly among soils irrigated with different water sources. With respect to soil
fertility, SOC was in medium range in majority of the soil samples. The available
nitrogen ranged from low to medium while, available potassium content was in
medium to high range. Significant differences were observed with respect to available
nitrogen and potassium contents among soils irrigated with different water sources.
Available-P2O5 was observed in low to medium range and no significant difference
was found with respect to irrigation water sources or cropping systems.
Among secondary nutrients, available Ca and Mg contents were in medium to
high range and no significant differences were observed with respect to sources of
irrigation water and cropping systems. Available-S content in these soils were found
in all the three ranges namely, low, medium and high. Among micro nutrient contents,
DTPA-Cu, Fe and Mn were in higher range and differed significantly with water
sources. However, DTPA-Zn was found in all the three low, medium and high ranges
and it varied significantly. In terms of nutrient availability in different cropping
systems, in general, it was observed in the order: Sugarcane > Maize/Groundnut-
Onion > Cereal-Pulse cropping systems.
The correlation for the above parameters revealed that the soil pH, ECe,
CaCO3 and SOC recorded major influence on nutrient availability.The soil organic-C
had influenced only available-N and DTPA-Mn significantly. The soil pH was found
negatively and significantly correlated with DTPA – Mn, Fe, Zn and Cu contents. The
soil EC showed good correlation with CaCO3, Available - K2O, Mg and S contents.
The soil CaCO3 content showed negative correlation with available-P2O5, available-
Ca and DTPA-Fe, Mn, Zn and Cu.
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