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STUDIES ON NUTRIENT STATUS OF COTTON GROWING SOILS OF GUNTUR DIVISION OF GUNTUR DISTRICT, A. P.

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Title STUDIES ON NUTRIENT STATUS OF COTTON GROWING SOILS OF GUNTUR DIVISION OF GUNTUR DISTRICT, A. P.
 
Creator DEBIPRASAD, SENAPATI
 
Contributor VEERAIAH, K
 
Subject livestock, costs, agreements, contract farming, manpower, productivity, marketing, profit, variable costs, biological phenomena
NUTRIENT, COTTON, SOILS
 
Description A research problem was under taken during 2010-11 to study the nutrient
status of cotton growing areas of Guntur division in Guntur district of Andhra
Pradesh. Representative surface soil samples were collected covering fifteen
mandals of Guntur division before sowing of cotton crop. The soil samples were
analyzed for their physico-chemical properties. During the square formation and
flowering stage, index leaves were collected from the same locations. The leaf
samples were analyzed for their nutrient contents as it will give an idea about the
plant nutrient status. Finally the cotton kapas yield data was collected from the
same locations. The correlation studies were carried out between yield with soil
available nutrients and plant nutrient concentrations and also between available
soil nutrients with leaf nutrient concentrations.
The soil samples of the cotton growing areas of Guntur division were
found to be mildly alkaline and non saline. These soils were low in organic
carbon content and soil available nitrogen content but medium to high in
available phosphorous content. Most of the soils were rich in available potassium
content with exception in sporadic patches. The secondary nutrients were found
in sufficient quantity. With regards to the micronutrient contents, the soil samples
were sufficient in available manganese and copper but deficient in available iron
and zinc content.
The nitrogen concentration in the cotton index leaves were found to be
low in both square formation and flowering stage and the concentration also
decreases from square formation to flowering stage. During the crop growth
period due to heavy rainfall water logging condition prevailed, which may
hinders the nitrogen uptake by the plant. The phosphorus and potassium
concentration of the leaves were high and their amount decreases from square
formation stage to flowering stage. The analyzed leaf samples were rich in
calcium content but water logging situation in some areas cause lowering of
magnesium concentration in the leaves. All the micronutrients were found in
sufficient levels in the index leaf samples irrespective of their availability in soil.
This signifies that due to deep rooted nature of cotton crop, it can trap the
nutrients from the deeper depths of the soil to meet its nutritional demand.
This year the cotton kapas yield is low (mean 2920 kgha -1) due to abrupt
weather condition and severe sucking pest infestation during the crop growth
period. The correlation studies revealed that significant positive correlation exist
between available potassium and calcium with the yield while magnesium,
sulphur and zinc showed significant negative correlation with the yield. In case
of leaf nutrient concentration, nitrogen and manganese concentration during
flowering stage were having significant positive correlation with the yield but
potassium and calcium had significant negative correlation with the yield. The
available phosphorous and calcium showed significant positive correlation with
the zinc concentration of leaves at square formation stage while available zinc
had significant positive correlation with the leaf calcium content. During the
square formation stage significant negative correlation existed between organic
carbon content of soil and leaf sulphur content. Both available calcium and
magnesium showed significant negative correlation with the potassium content of
leaves. The available copper had significant negative correlation with leaf copper
content at square formation stage but during flowering stage the available copper
showed significant positive correlation with the leaf copper content. Significant
positive correlations existed between available nitrogen content to the leaf
potassium, available potassium, calcium and magnesium with the leaf
phosphorous content at flowering stage. The available potassium and magnesium
had also significant positive correlation with the iron content of leaves in the
flowering stage of crop growth. The available calcium had significant positive
correlation with the leaf nitrogen content but it had also significant negative
correlation with the magnesium concentration of leaves during flowering stage.
The study indicates that phosphorous application can be skipped for one
season without reduction in yield along with split application of nitrogen and
potassium to get the sufficiency ranges at square formation and flowering stages
which can finally reflect the higher yields.
 
Date 2016-06-04T10:09:07Z
2016-06-04T10:09:07Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66746
 
Language en
 
Relation D9034;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY