Indian Journal of Weed Science
  • Year: 1984
  • Volume: 16
  • Issue: 3

Uptake and Utilization of Phosphorus by Sorghum under Weed Free and Weed Infested Situations1

  • Author:
  • Arun Sathe, M. Badrinarayan Rao, Y. Seethambaram, S. M. Kondap2
  • Total Page Count: 6
  • Page Number: 165 to 170

2Department of Soil Science and Agricultural Chemistry and Dept. of Agronomy

1 Contribution from Radio Tracer Laboratory, Andhra Pradesh Agricultural Univesrity, Rajendranagar, Hyderabad-500030

Abstract

Application of 30 kg P205/ha alongwith physical or chemical weeding gave almost as much grain and straw yields of sorghum as application of 60 kg P2Os/ha without weeding. Phosphorus uptake, per cent P derived from fertilizer (% Pdff) and fertilizer P uptake increased with increasing levels of phosphorus application both in sorghum and weeds. With an increase in the dose of P application from 30 to 60 kg P205/ha there was a decrease in %P utilization by sorghum but an increase in %P utilization by weeds. Applied phosphorus was better utilized by sorghum when weed control was done by hand weeding, by using cultivator or by applying atrazine (1 kg/ha) than the plots were left unweeded.