Requirement of phosphorus and its use efficiency by sunflower (Helianthus annuus L.) in high phosphorus soils


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REQUIREMENT OF PHOSPHORUS AND ITS EFFICIENCY BY SUNFLOWER IN HIGH PHOSPHORUS SOILS

Authors

  • A MADHAVI Agril. Research Institute, PJ Telangana State Agril. University, Rajendranagar, Hyderabad-500 030, Telangana State
  • P SURENDRA BABU Agril. Research Institute, PJ Telangana State Agril. University, Rajendranagar, Hyderabad-500 030, Telangana State
  • P VENKATA REDDY Agril. Research Institute, PJ Telangana State Agril. University, Rajendranagar, Hyderabad-500 030, Telangana State

https://doi.org/10.56739/jor.v32i1.141816

Keywords:

High P-soil, Per cent Pdff, P-levels, P-utilization, Sunflower

Abstract

Field experiments were conducted during kharif 2008, 2009 and 2010 to find out the phosphorus requirement to sunflower crop grown in a soil with high initial available phosphorus (110-119 kg P2O5
/ha). Three years pooled data revealed that application of 100% recommended dose of P2O5
(RDP) resulted highest seed yield of 12.18 q/ha. The seed yield increased significantly by about 9.51, 11.75, 12.50 and 13.62 per cent due to application of 25 (11.74 q/ha), 50 (11.98 q/ha), 75 (12.06 q/ha) and 100 (12.18 q/ha) per cent RDP, respectively over control (10.72 q/ha). However, the differences in seed yields observed at 50, 75 and 100% RDP are narrow and imperceptible. The per cent phosphorus derived from fertilizer (% Pdff) and phosphorus-use efficiency decreased significantly from 21.10 to 19.93 per cent and 24.19 to 6.67 per cent, respectively due to increase in P level from 25 to 100% RDP, whereas the fertilizer P uptake and soil P uptake increased from 1.58 to 1.75 kg/ha and 5.93 to 7.03 kg/ha, respectively with increase in P level from 25 to 100% RDP. The extent ofsaving in P fertilizer in these soils is ranged from 75 to 100 per cent depending upon the P build up in the soil.

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References

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Submitted

2023-09-01

Published

2015-12-31

How to Cite

A MADHAVI, P SURENDRA BABU, & P VENKATA REDDY. (2015). Requirement of phosphorus and its use efficiency by sunflower (Helianthus annuus L.) in high phosphorus soils: REQUIREMENT OF PHOSPHORUS AND ITS EFFICIENCY BY SUNFLOWER IN HIGH PHOSPHORUS SOILS. Journal of Oilseeds Research, 32(2). https://doi.org/10.56739/jor.v32i1.141816