Forms, availability and transformation of potassium in laterite soils as influenced by crop uptake
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Date
1998
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Department of Soil Science and Agricultural Chemistry, College of Horticulture, Vellanikkara
Abstract
An investigation was taken up to study the fate of applied and native
potassium in a laterite soil as influenced by other major nutrients and organic matter
and uptake by an annual crop, banana. The experiment was laid out at Banana
Research Station, Kannara, Kerala Agricultural University during the period 1996-
1997.
The result of the study revealed the necessity of fertilization of the
field/soil for better yield. The maximum content and uptake of nutrients N, P and K
occurred during the early and late vegetative stages of banana. Hence fertilizers
should be applied for the crop from 2 months after planting onwards and continued
up to six months after planting. Correlation studies revealed the significant
relationship of total K in the soil with yield at different stages. Also poistive
correlation between the exchangeable K content in the soil and yield was
established. Path coefficient analysis revealed that the direct effect of total K
content in the soil on yield was highest at P4 (6 MAP). The indirect effect was
maximum at P4 (6 MAP) through P3 (4 MAP). The exchangeable K also was found
to have positive direct effect on yield. The indirect effects were not significant.
Water soluble K at different stages showed a direct effect of comparable magnitude
on yield.
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Citation
171353