BIO-INTERVENTION OF GRANITE ROCK DUST WITH ORGANIC MANURE TO ENHANCE THE POTASSIUM RELEASE RATE AND PRODUCTIVITY OF MAIZE IN CENTRAL DRY ZONE (ZONE-4), KARNATAKA
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Date
2023-02-07
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Two field experiments were conducted during two successive Kharif seasons of 2020 and 2021 in Ramagiri, Holalkere Taluk, Chitradurga District, Karnataka, to investigate the effect of bio-intervention of granite rock dust with different organic manures in enhancing the potassium release rate and their effect on productivity of maize. The field experiment comprised of twelve treatments which were replicated thrice in RCBD. From the field experiment it was found that significantly higher kernel (87.63 q ha-1) and stover yield (120.99 q ha-1) were recorded in T11 (75% K +Bio-enriched pressmud compost treated Rock dust @ 6 t/ha) compared 100% RDF alone (T2). In case of K release pattern, the highest Water Soluble K (31.07 mg/kg) at 30 DAS, Exchangeable K (688.12
mg/kg) and Non-Exchangeable K (3660.32 mg/kg) at 120 DAS was found in T11 as compared to other treatments. Significantly highest uptake of N (270.86 Kg/ha), P (40.49 Kg/ha) and K (249.80 Kg/ha) was observed in T11 and similar trend being with respect to uptake of minor nutrients. The highest soil available nutrients after harvest of the maize crop were recorded where bio-intervened granite rock dust was applied than compared to other treatments. From the incubation study which was conducted with 11 treatments replicated thrice in CRD, it was observed that highest release rate of Water Soluble K
(139.29 mg/kg) at 30 DAI, Exchangeable K (407.00 mg/kg) and Non-Exchangeable K (4479.95 mg/kg) at 120 DAI was found where soil was used with bio-enriched pressmud compost treated rock dust. Similarly, highest release rate of Water Soluble K (2995.33 mg/kg) at 30 DAI, Exchangeable K (2765.02 mg/kg) and Non-Exchangeable K (17755.90 mg/kg) at 120 DAI was found in Bio-enriched press mud compost treated rock dust without soil.
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