Monday, 10 July 2006
23-8

Characterization of Soils under Kabini Tract of Cauvery Command Area and Rice Response to Amendments.

Guruprasad, Subbarayappa, Badrinath Chidanandappa, UAS,GKVK, GKVK, Bangalore, 560065, India

Kabini is one of the chief and prominent sources of irrigation for the Mysore and Chamarajanagara districts of Karnataka. Among the selected soils of Kabini tract of Cauvery command area, the alkalinity problem is more in the soils of Chamarajanagara taluk (pH: 8.56-9.05, ECe: 0.86-1.24 dsm-1, ESP: 34.8-42.8 per cent and SAR: 13.3-19.6) followed by the soils of Kollegala (pH: 8.43-8.76, ECe: 0.86-1.24 dsm-1, ESP: 33.5-40.6 per cent and SAR: 13.3-18.1%) and Yalendur (pH: 8.42-8.69, ECe-0.82-1.13 dsm-1, ESP: 31.8-33.5 per cent and SAR: 13.2-16.8) the least problem was noticed in the soils of T. Narasipura taluk (pH: 7.10 to 8.63, ECe: 0.49-1.04 dsm-1, ESP: 10.1-27.3 per cent and SAR: 4.17 to 14.6). Field experiment was carried out to study the effect of different amendments and their combinations for reclamation of alkali soils by employing KRH-2 hybrid rice as a test crop, during kharif 2004 at Hainoorhundi village, Kollegala taluk. The experiment was laid out in RCBD design with eight treatments and three replications. The results indicated that treatment combinations of RDF+100 per cent gypsum requirement + FYM 5 t ha-1 + pressmud 5 t ha-1 reduced the pH from 8.68 to 8.40, ECe from 1.16 to 0.82 dsm-1, ESP from 32.0 to 21.1 per cent and SAR from 18.65 to 12.26 and has significantly increased the available N and P status of the soil, grain (5045 kg ha-1), and straw yield (7324 kg ha-1) of KRH-2 hybrid rice. Higher uptake of NPK was also recorded in the treatment combinations of RDF+100 per cent gypsum requirement + FYM 5 t ha-1 + pressmud 5 t ha-1. The highest uptake of Ca, Mg and S was recorded in the treatment combinations of RDF+100 per cent gypsum requirement + pressmud 10 t ha-1.


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