Effect of Phosphorus Fertilizers on Growth and Physiological Phosphorus Use Efficiency of Three Soy Bean Cultivars

A pot experiment was conducted to study the effect of difference phosphorus fertilizers on growth and nutrient status of soya bean cultivars. The treatments including, three cultivars of soybean (C1=4.7, C2=43355, C3=44NK), the phosphorus fertilizers including (P1=Control no fertilizer,P2=Triple super phosphate, P3=Di ammonium phosphate,P4=Di potassium phosphate, P5=NPK 20:20:20 with some trace elements and P6=NPK 12:36:12 with Mg) each of them applied in 75 Kg P.ha -1 . The factorial experiment was laid out in a complete randomized design (CRD) with three replicates. The results indicates that the highest values (23.47 g.pot -1 12.07 g.pot -1 and 1117.62 kg.ka -1 ) for shoot dry matter , root dry matter and biological yield respectively were given by the application superphosphate fertilizers in the cultivar 44NK followed by the cultivars 4.7 and 43355 which treated by the PK and NPK (12:36:12) Mg respectively. However the result revealed that the increase in uptake of P with the application of phosphorus over control was 280.49% in case of 44NK cultivar, 255.01 % in case of 4.7 cultivar and 99.75% in case of 43355cultivar. The high values of PUEp (55.556%) and PFE(10.079%) were recorded by the application of superphosphate in 44NK cultivars, while the low values were (4.622% and 0.392%) over control recorded by the application of NPK(20:20:20) trace elements and super phosphate in case of 4.7 and 43355 cultivars respectively.