Effect of conservation agriculture technologies on soil physical properties and rice yield in rice-blackgram system for hilly zone of karnataka

Keshavamurthy G. M., R. Basavarajappa, H. B. Babalad and S. R. Kareekatti

An experiment was carried out at Agriculture Research Station, Mundgod, Uttara Kannada District of Karnataka on conservation agriculture for the rice-blackgram system for hilly zone of Karnataka in 2014-15 and 2015-16. The experiment was conducted in strip block design with sixteen treatments with control and three replications. Among the Conservation tillage (CT) practices, CT (no tillage) with BBF (135 cm) with residue retention on the surface along with organics (Compost 50% +VC 50%) equivalent 100% RDN and biological pest management + green leaf manuring @ 5t ha-1 (Gliricidia) recorded significantly lower bulk density (1.212 g/cc), pH (6.35), electrical conductivity (0.18 dSm-1), higher porosity (54.28%), infiltration rate (13.54 mm/hr), aggregate stability (41.60%), maximum water holding capacity (53.90%), organic carbon (0.60), lower resistance to penetration 231.67 and 270.00 kpa at 30 and 60 DAS respectively and lower soil temperature at 30, 60, 90, 120 DAS and at harvest (22.11oc, 21.52oc, 20.12oc, 19.75oc and 21.17oc respectively) as compared to rest of the treatments.

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