SOIL FERTILITY EVALUATION OF SELECTED MICRO-WATERSHEDS IN MAHESHWARAM WATERSHED PROJECT IN A. P.
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Date
1993
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ANDHRA PRADESH AGRICULTURAL UNIVERSITY
Abstract
With a view to evaluate the soil fertility status
of selected micro-wotcrahcdn in Mnhcuwarom wn l:cH"Hhcd nrcll
an investigation was carried out during 1991-92.
The study revealed that the soils belonged to two
textural classes viz., loamy (77.6%) and sandy (22.4%).
Regarding soil reaction 73.9, 19.4, 1.8 and 4.9 per cent
s~mples were neutral, weakly alkaline, tending to alkaline
and alkaline respectively. All the soils were free from
salinity. The soils were low in organic carbon, available
N and available P and high in available K with nutrient
indices 1.1, 1.1, 1.5 and 2.5 respectively. All the
samples were above the critical limit for the micronutrients
Fe, Mn, Cu and Zn barring 3 samples which were
below the critical limit for iron. Fertility maps based on
soil test values and nutrient indices were prepared.
Contour maps showed that the fertility Rtntus increnRcd
from the watershed line to the centre. The soils of 9,
9A, 11 and 13 micro-watershed were richer in fertility
status as compared to the other microwatersheds.
The super imposition of the physiographic map
over the study area showed that the soils associated with
the land forms granite undulating slope and valleys are
richer in nutrients as compared to granite hills and that
the intensively cultivated deep soils are highly depleted.
A spatial variogram showed good relationship for the
studied soil parameters in the alfisol-inceptisol tract
compared to the entisol-inceptisol tract. Based on the fertility
status of the area a fertility strategy for sustainable
agriculture was suggested.
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