Abstract
Supplementing N fertilizer demand of flooded rice (Oryza sativa L.) crop by integrated means is important area of research for economical and sustainable agriculture. For present field trial, three soil N rates (60, 90, 120 kg ha−1) were applied to main plots. Before transplantation to randomized subplots, roots of rice seedlings were dipped for 1 h in water (control), Azospirillum and Azotobacter in 1:1 ratio (diazotrophs) or diazotrophs + 10−5 M L-tryptophan (L-TRP). Compared with control of seedling treatment, diazotrophs alone or in combination with L-TRP significantly (P≤0.05) increased straw and paddy yields at low (60 kg N ha−1) and medium (90 kg N ha−1) rates of N. However, paddy yield was only non-significantly different between 90 kg N ha−1 with diazotrophs alone and 120 kg N ha−1 with or without diazotrophs. At 90 and 120 kg N ha−1 , most of the studied plant growth and nutrient accumulation responses were statistically at par between seedling treatments with diazotrophs and diazotrophs + L-TRP. Nitrogen application was the main factor that influenced N concentration in plant tissues. However, seedling treatments also significantly increased N and P concentration in rice straw and grain. Maximum net value of the produce and value-to-cost ratio were achieved with diazotrophic inoculation at 90 kg N ha−1 . Conclusively, diazotrophic inoculation supplemented N demand of flooded rice by potentially fixing atmospheric N2 and influencing nutrient dynamics in soil.

Muhammad Aon, Muhammad Khalid, Shahid Hussain, Muhammad Naveed, Muhammad Javed Akhtar. (2015) Diazotrophic Inoculation Supplemented Nitrogen Demand Of Flooded Rice Under Field Conditions, , Volume-52, Issue-1.
  • Views 248
  • Downloads

Article Details

Volume
Issue
Type
Language