Effect of N and Azospirillum on rice N uptake
1987
Prasad, J. | Singh, S.B. (National Bureau of Soil Survey and Land Use Planning, Seminary Hills, Nagpur (India))
A pot experiment was conducted in Entisols of Indo-Gangetic alluvium (pH 7.2, 0.043% total soil N, 5.0 ppm Olsen P, 103 ppm 1N NH4 OAcK) with 4N levels (0, 15, 30, and 45 ppm) and Azospirillum (A. brasilense) inoculation on Saket 4. Earthern pots lined with polyethylene sheets were filled with 10 kg soil and basal dressing of 13.0 ppm P and 25.0 ppm K through single superphosphate and muriate of potash. Ammonium sulfate was the N source. Roots of 22-d-old seedlings were dipped in carrier-based inoculant slurry and seedlings transplanted at 5/pot. Yield was recorded, grain analyzed for N content, and uptakes calculated. N increased grain yield, grain N content, and N uptake. The highest values were associated with 45 ppm N. Each N increment increased the parameters. N fixation and production of growth promoting substances by Azospirillum might have contributed to improved root mass, thereby increasing grain yields and N uptake.
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