Field experiments were conducted with rice (ADT-39) during the wet Kharif season (July- October 2001) at two locations, the Tamil Nadu Rice Research Institute (TRRI) farm, Aduthurai (Vertisol) and the Agricultural Research Station (ARS) farm, Pattukkottai (Alfisol), representing the old and new delta areas of the Cauvery, respectively. The same set of treatments was followed in both soils. The treatments consisted of the recommended NPK fertilizer application at 75% and 100% alone, and 10 or 20 kg ha-1 humic acid (HA) in combination with NPK fertilizers as soil application, besides an integrated method involving soil application, root dipping and foliar spraying with humic acid and NPK fertilizers. initial soil samples from the experimental fields were analysed for physical, physico-chemical and chemical properties. Surface soil samples were collected at critical growth stages and analysed for various available nutrients. The results of the field experiments revealed that the application of humic acid along with inorganic fertilizers led to higher soil nutrient availability at all the growth stages of rice. Similar results were obtained in both Vertisol and Alfisol. The present investigation concluded that the best treatment for soil nutrient availability was 10 kg ha-1 HA (soil application) + 0.1% HA foliar spray (twice) + 0.3% HA root dipping + 100% NPK, which was on par with the treatment involving 20 kg ha-1 HA (soil application) + 100% NPK compared to the other treatments.
Stanford, S., English, L. (1949): Use of flame photometer in rapid soil tests of K and Ca. Agron. J., 4, 446-447.
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Use of flame photometer in rapid soil tests of K and CaAgron. J.4446447)| false
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Effect of humic acid on the availability of some plant nutrients in lignite mine spoil8)| false
Shanmugam, T., Aruljothi, M., Johan, A I. (1989): Preparation of micronutrients with lignite stocks. Proc. National Seminar on "Humus Acids in Agriculture". Annamalai University, Tamil Nadu. pp. 303-307.
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Preparation of micronutrients with lignite stocks303307)| false
Chandrasekaran, S. (1989): Efficient use of fertilizers by crops with humic acid addition in soils. Dr. N. R. Dhar Memorial Lecture. 22nd Annual Meeting of Indian Society of Agricultural Chemists held on 11th &12th Dec at TNAU, Coimbatore, Tamil Nadu.
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Efficient use of fertilizers by crops with humic acid addition in soils. Dr. N. R. Dhar Memorial Lecture)| false
Pandey, N., Upadhyay, S. K., Joshi, B. S., Tripathi, R. S. (2001): Integrated use of organic manures and inorganic N fertilizers for the cultivation of lowland rice in Vertisol. Indian J. Agric. Res., 35(2), 112-114.
'Integrated use of organic manures and inorganic N fertilizers for the cultivation of lowland rice in Vertisol' () 35(2)Indian J. Agric. Res.: 112-114.
Integrated use of organic manures and inorganic N fertilizers for the cultivation of lowland rice in VertisolIndian J. Agric. Res.35(2)112114)| false