This study was conducted at wetlands, Tamil Nadu Agricultural University, Coimbatore (11°N and 77°E) during Navarai (Dec-May) season of 2003-04 in Noyyal series, clay soil (Vertic ustochrept), to explore the effects of certain of the Integrated Crop Management (ICM) practices involving two genotypes (CORH 2 and ADT 46), three establishment methods (direct seeding, 14 days old young seedlings-SRI mat nursery and 28 days old conventional seedlings), two manuring (inorganics alone and INM) and two weeding practices (manual weeding and mechanical weeding) on rice (Oryza sativa L.) crop root volume and rhizosphere redox potential. The results revealed that there was a progressive and conspicuous increase in the root volume and dry matter production with the advancement of crop growth stages. Hybrid CORH 2 recorded higher root volume and DMP than the variety ADT 46 at AT, PI and FF stages. Planting of SRI mat nursery seedlings (14 days old) registered higher root volume when compared to the other establishment methods (direct seeding and 28 days old seedlings). The manuring practices viz., inorganics alone (G0) and INM (G1) failed to influence the root volume and DMP. Mechanical Weeding (W2) recorded higher root volume than the manual Weeding (W1) and the same mechanical weeding better aerated the rhizosphere region by increasing the redox values.
B. Jayakumar, C. Subathra , V. Velu and S. Ramanathan , 2005. Effect of Integrated Crop Management Practices on Rice (Oryza sativa L.) Root Volume and Rhizosphere Redox Potential. Journal of Agronomy, 4: 311-314.