FRACTIONS OF PHOSPHORUS, SULPHUR AND BORON IN SOIL UNDER LONG TERM FERTILIZER EXPERIMENTS OF FINGER MILLET-MAIZE AND RICE-COWPEA CROPPING SYSTEMS OF KARNATAKA
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Date
10-08-13
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Abstract
Ongoing long term fertilizer experiments under finger millet-maize and
rice-cow pea cropping systems at GKVK Bengaluru and VC Farm Mandya were
selected to study the different fractions of phosphorus, sulphur and boron in
soil. Besides the fractions, their available nutrient status was also studied. The
results of the finger millet-maize cropping system indicated that application of
chemical fertilizer in combination with FYM revealed that all the available
nutrients were maintained. With respect to P fractions like Al-P, Fe-P, Occl-P
and total-P were found to be higher in 150 % NPK applied treatment; however
Ca-P was higher percent in treatment receiving 100 % NPK+FYM+Lime. Higher
percent of available sulphur and its fractions were recorded in treatments
receiving single super phosphate and lower availability and its fractions were
noticed in T9-100%NPK-S and T7-100%N. Higher boron availability and its
fractions were recorded in treatments receiving FYM along with chemical
fertilizers. In rice-cow pea cropping system here also available nutrient status
maintained in inorganic and FYM applied treatments .Higher phosphorus
availability was recorded in treatment receiving STCR based fertilizer
recommendation. Higher per cent of Al-P, Fe-P, Occl-P and total-P fractions
were recorded in 100%NPK+Zn+S treatment. With respect to sulphur
availability and its fractions 100%NPK+Zn+S recorded higher values. Available
boron and its fractions were higher in FYM applied treatments compared to
other treatments. Hence the application of recommended doses fertilizer in
combination with FYM helps to better maintenance of soil health as well as
available nutrient status of soil.
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biological phenomena, developmental stages, genes, organic compounds, communication technology, proteins, biological development, necrosis, research methods, concentrates