Distribution of exchangeable cations and available micronutrients in soil profiles of mango orchards under semi arid conditions of latur (m.s.)
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Date
2009-05-29
Authors
Journal Title
Journal ISSN
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Publisher
Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
An investigation was carried out to study the distribution of
exchangeable cations and available micronutrients in soil profiles of mango orchards
of Latur district. In all 10 soil profiles at five different spacings were selected for this
experiment. From each soil profile, 6 soil samples (0-15, 15-30, 30-45,45-60, 60-75,
75-90 em depth) were collected and analysed for exchangeable cations and available
micronutrients.
The results obtained from this investigation revealed that the bulk
density and particle density of these soils ranged between 1.14 to 1.59 and 2.40 to
2.80 Mg m- with average value of 1.39 and 2.80 Mg m-3
, respectively. It was
observed that bulk density of soil increased with increase in depth while no any
proper trend was observed in case of particle density.
The pH, EC, organic carbon and CaC03 of these soils ranged between
8 to 8.5, 0.09 to 0.16 dSm-I, 0.38 to 0.77 per cent and 41 to 177 g kg-1 with average
value of 8.25, 0.13 dSm-I, 0.58 per cent, 86.50 g kg-I, respectively. Further it was
found that pH and CaC03 content of these soils were increased with increase in depth
while organic carbon content was decreased with increase in depth. In case of soil EC
no proper trend was observed. The data reveals that mango orchard soils sufficiently
supplied with organic carbon and calcareous in nature.
The exchangeable cations viz., Ca++, Mg++, Na+ and K+ were ranged
between 14 to 41, 09 to 22, 0.53 to 0.93 and 0.14 to 0.86 cmol kg-1 with mean value
of29.60, 15.53, 0.74 and 0.40 cmol kg-1
, respectively. The exchangeable cations viz. ,
Ca++, Mg++ and Na+ content in soil were increased with increase in depth while
reverse trend and observed in case of exchangeable K+.
The available micronutrients Cu, Fe, Mn, Zn and B in soils of mango
orchard were ranged from 0.35 to 1.40, 0.16 to 3.23, 1.44 to 9.99, 0.08 to 0.39 and
0.20 to 1.40 with average value of 0.91 , 2.28, 4.22, 0.16, 0.57 mg kg1
, respectively.
All these micronutrients in the soil decreased with increase in depth. The data further reveals that mango orchard soils were sufficient in Fe, Mn, Cu and B while deficient
inZn.
The soil pH and CaC03 content in mango orchard soil was
significantly and negatively correlated with all available micronutrients while organic
carbon was significantly and positively correlated with all available micronutrients.
The data further revealed that their was no any effect of plant spacing
on distribution of exchangeable cations and available micronutrients in soil of mango orchard.