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4671 results in Experimental Agriculture

Page 52 of 234

  • SELENIUM FORTIFICATION AND PRO/ANTI OXIDANT RESPONSES IN ALLIUM CEPA (ONION) CULTIVATED IN Se SUPPLEMENTED SOILS

  • N. TEJO PRAKASH, NEETU SHARMA, RANJANA PRAKASH, T. N. NATHANIEL, R. ACHARYA, A. V. R. REDDY
  • Journal:
    Experimental Agriculture / Volume 46 / Issue 4 / October 2010
    Published online by Cambridge University Press:
    21 July 2010, pp. 531-540

  • Native plantlets of Allium cepa (onion) were cultivated in selenium (Se)-supplemented soils to observe dose- and time-dependent uptake and associated pro/anti-oxidant activity. Allium plantlets were grown in soils supplemented with Se at 2.5, 5.0 and 7.5 mg kg−1 as selenite (Na2SeO3) and selenate (Na2SeO4) for 40–120 days. The effect of different concentrations of Se oxyanions on the growth and accumulation profile in plants in relation to glutathione peroxidase activity and thiobarbituric acid reactive substances was studied. Total Se concentrations in plantlets were determined by instrumental neutron activation analysis. The accumulation of Se in plant was observed to be dose dependent in the case of selenite, but, no definite correlation between accumulation levels and exposed concentration was observed. The changes in pro/anti-oxidant properties were observed to be dependent on the accumulation of Se in plant.

  • DETERMINATION OF THRESHOLD REGIME OF SOIL MOISTURE TENSION FOR SCHEDULING IRRIGATION IN TROPICAL AEROBIC RICE FOR OPTIMUM CROP AND WATER PRODUCTIVITY

  • A. GHOSH, O. N. SINGH
  • Journal:
    Experimental Agriculture / Volume 46 / Issue 4 / October 2010
    Published online by Cambridge University Press:
    19 July 2010, pp. 489-499

  • Aerobic rice is considered a viable agro-technology to cope with the looming crisis of water supply that threatens the sustainability of irrigated rice production systems. Rice adapted to aerobic conditions requires less water than that grown under conventional irrigation management. A field study was conducted at Cuttack, India, during the dry season (January–May) in 2005 and 2006 to determine the critical soil moisture regime at the root-zone depth (30 cm) for sustaining optimum growth and grain yield of aerobic rice variety ‘Apo’ (IR 55423-01). Irrigation at 0, 20 and 40 kPa soil moisture tension resulted in similar grain yields (4.90–5.25 t ha−1 in 2005 and 4.35–4.50 t ha−1 in 2006). The seasonal water requirement in treatments receiving irrigation at 20, 40 and 60 kPa soil moisture tensions was 28.4, 42.8 and 60.7% lower than that at 0 kPa soil moisture tension, but the yield declined significantly at 60 kPa, i.e. by 42.8% in 2005 and 36.7% in 2006. Irrigation at 40 kPa soil moisture tension ensured maximum water productivity of 0.90, 0.47 and 0.53 g grain kg−1 water with respect to evapotranspiration, irrigation plus rainfall and irrigation alone, respectively. Thus, irrigation at 40 kPa soil moisture tension may be considered critical for optimum grain yield and maximum water productivity of aerobic rice in Indian cultivation conditions.

Page 52 of 234