PJB-2022-421
Comparative Effect of Mineral Phosphorus Sources and Levels on the Yield and Quality of Nicotiana tobacum
Muhammad Tariq
Abstract
The impact of different mineral phosphorus (P) fertilizers on the bio-availability of P in calcareous soils is conflicting in literature. Therefore, this field expeiment was design to study the comparative effect of different P levels (0, 75, 100 and 125 kg P2O5 ha-1) supplied as different mineral fertilizers [single super phosphate (SSP), triple super phosphate (TSP), di-ammonium phosphate (DAP) and nitrophos (NP)] on the yield and qulaity of tabacco. Leaf area (826.7 cm2), number of leaves (24), green leaf weight (4741 kg ha-1), cured leaf weight (2365 kg ha-1) and grand index (86%) of tobacco were significantly improved with application of DAP at the rate 100 kg P2O5 ha-1. Moreover, nicotine (2.0 %) and sugar (20.4 %) contents were considerably increased, and chloride (0.48 %) content was decreased at 100 kg P2O5 ha-1 as DAP. Leaf P concentration (0.13 %) and agronomic efficiency were also higher at 100 kg P2O5 ha-1 applied as DAP. Among the sources the promising effect in terms of yield, quality and agronomic efficiency were observed in the order of DAP>SSP>TSP>NP. Therefore, for the better growth and quality tobacco application of 100 kg P2O5 ha-1 as DAP is recomended under calcarious soils.
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