Effect of Phosphate and Zinc Bio-Treatments on Inorganic Phosphorus Fractionation in Root Zone Soil of Two Cultivars of Bean (Phaseolus vulgaris L.)

In order to study the effect of phosphate and zinc bio-treatments on inorganic P fractionation in two cultivars of bean, an experiment was conducted as factorial in a completely randomized design. The research treatments consisted of two cultivars of bean (Talash and Sadri), four levels of P (P0: Control, P1: Use of TSP fertilizer on the basis of soil test, P2: 50 percentage of TSP + P biofertilizer, and P3: Use of P biofertilizer), and three levels of Zn (Zn0: Control, Zn1: 50 kg ha-1 ZnSO4, and Zn3: Use of biological Zn treatment). The results revealed that there were significant differences between the two cultivars on Ca2-P, Ca8-P, Ca10-P and total P. The minimum amount of inorganic P fractions was obtained from root zone soil of Sadri cultivar. The effect of P treatment was significant on inorganic P fractions, except Al-P, Fe-P and O-P. The amount of inorganic P forms showed an increase in P1 and a decrease in P2 and P3 treatments. The effect of Zn treatment was significant on inorganic P fractions, except Al-P and O-P. The minimum amount of inorganic P fractions was obtained from Zn2. Among the interaction effects, the triple interaction effect of cultivar × P × Zn was significant on Ca2-P and Ca10-P and the double interaction effect of P × Zn was significant on Ca2-P، Ca8-P, Ca10-P and TP. The maximum amounts of these forms were obtained from C1P1Zn0 and P1Zn0, and the minimum from C2P2Zn2, P2Zn2 and P2Zn3 treatments. Sadri cultivar and phosphate and Zn bio-treatments had higher efficiency in release and uptake of P inorganic forms.