“STUDIES ON EFFECT OF LONG TERM SOIL FERTILITY MANAGEMENT ON BEHAVIOUR OF POTASSIUM IN RICE-COWPEA CROPPING SYSTEM
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Date
26-08-13
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University of Agricultural Sciences GKVK, Bangalore
Abstract
An experiment was conducted at Zonal Agricultural Research Station, VC
farm, Mandya to study the effect of long term soil fertility management on behavior
of potassium with respect to different forms, their distribution pattern, and fixation
and release characteristics in rice-cowpea cropping system. Soil samples collected at
0-15cm and 15-30cm were analyzed for physico-chemical properties, major and
micro nutrients as well as different forms of K, K fixation capacity and K releasing
characteristics. The plant samples were analyzed for nutrients composition after
harvest of the crop then potassium uptake was calculated.
Results indicated that continuous use of chemical fertilizers along with
manures increased the organic carbon, available primary, secondary and
micronutrients content. Yield and yield attributes were also high in those particular
treatments. The water soluble, exchangeable and non-exchangeable forms of
potassium were relatively higher due to addition of organic manures continuously for
longer period. The K fixation capacity didnot vary much between the treatments. The
treatments having more of non-exchangeable K recorded high amounts of cumulative
K released.
A significant positive relationship was observed between grain yield with
physico- chemical properties and available K which was positively correlated with
exchangeable and water soluble K fractions. However, K fixation capacity was
positive with non exchangeable and total K fractions at both depths. From this study it
could be concluded that for maintaining the K supplying power of these soils which
are sandy loam in texture for longer period needs regular application of K through K
fertilizers integrated with organic manures.
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Keywords
potassium, crops, fertilizers, farmyard manure, rice, organic fertilizers, yields, nutrients, grain, cropping systems