GROUNDNUT LEAF NUTRIENT STATUS AND SPECTRAL CHARACTERIZATION IN RELATION TO SOIL FERTILITY
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Date
2015-03
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University of Agricultural Sciences, Dharwad
Abstract
A study was undertaken in groundnut growing soils of Dharwad taluk in northern
transitional zone of Karnataka during Kharif 2013-14. One hundred surface soil samples were
collected from the groundnut growing fields of different villages in Dharwad taluk. Index leaf
samples were also collected from same fields at flowering stage. Canopy spectral
reflectances under visible (VIS) and infra-red (IR) bands were recorded using spectro
radiometer in each of the field where leaf and soil samples were collected. Sampling locations
were recorded by using global positioning system (GPS) meter.
Available nitrogen status was predominantly low (81 % samples) whereas more than
half (62 per cent) of the fields were medium in available phosphorus. Available potassium and
sulphur contents were high in 76 and 48 per cent of the fields, respectively. All the fields
registered sufficient exchangeable calcium and magnesium, available copper and
manganese. Zinc was the most deficient while; only 25 per cent samples were deficient in
available iron.
Nitrogen concentration in groundnut leaves was rated medium in 70 per cent of the samples. Higher P, K, S, Ca, Mg, Zn, Fe, Fe2+, Cu and Mn concentrations were observed in
groundnut plants.
Among the major nutrients, available nitrogen had significant and positive correlation
with leaf nutrient content. Available phosphorus had significant and positive correlation with N,
P, K, Ca, Mg and Mn content of leaves while, it had significant negative correlation with leaf
Zn concentration.
The NDVI registered significant positive correlation with chlorophyll, N, P, K and Fe content and weak relationship with S, Ca and ferrous Fe content of groundnut crop. RVI
showed significant correlation with chlorophyll and N content and poor relationship with plant
P, K, S, Ca, total Fe and ferrous Fe.
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