10742

Effect of Phosphorus Fertilization on Dry matter Accumulation and it's Remobilization in Oil seed Flax (Linum usitatissimum L.)  under rainfed condition

Shiren Jalal Mohamed1,  Shilan  Mahmood  Ahmed1,   Solaf Adnan Mahmood1    

1 Crop Science Department – College of Agricultural Sciences -University of Sulaimani – Bakrajo Street, Sulaimaniyah-Iraq                 


Original: 1 December 2018
  Revised: 15 April 2019 
 Accepted: 21 May 2019
 Published online: 20 June 2019 

Abstract

This experiment was carried at Qlyasan Research Station. Faculty of Agricultural Sciences,  University of Sulaimani, during 2016-2017   to study the effect of four levels of phosphorus fertilizer in the form of P2O5 (0 control, 100, 200 and 300 kg P2O5ha-1) on two oilseed flax varieties (Poland and Syria local) dry matter and Phosphor  accumulation  and their  translocation from source to sink  . Results showed that Poland variety with the 200kg P2o5 ha-1 in all studied parameters significantly being higher than Syria local, and other levels of P2O5 fertilizer. Compared to control 200kg P2O5 increased DM  accumulation at 50%  anthesis by (44.48 and 27.04%), DM translocation efficiency by (24.46and 38.19 %), Contribution of leaves DM to final grain by (53.57 and 44.060%), P accumulation in vegetative tissues at 50% anthesis  by (69.59 and 81.65 %), P translocation efficiency by (51.85 and 70.02%), leaf P contribution to final grain by (50.69 and 73.63%), also at maturity increased  biological yield by (27.16 and 29.72%),  and increased  grain yield by (20 and 27%) for Poland and Syria local respectively, with no significant increment above that level. In both varieties at 50% anthesis the leaves DM were increased and reached peak at 200kg P2O5ha-1 but as the plant reached maturity the leaves DM significantly lower by ten times than stem DM+NG. These results suggest that 1.The leaves in oil seed flax are the major DM and P contributor to grain after anthesis whereas the stem and NG are the stronger demand for DM and P post anthesis.2. Variety of Poland under the 200kgP2O5 ha-1 could be suitable for grain yield under rainfed condition in Sulaimani province. 


Key Words: Flax variety, Phosphorus fertilizer, Dry matter accumulation, P remobilization



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