The Effect of Phosphorus Biofertilizers on Yield and Phosphorus Uptake in Potato

To evaluate the effect of phosphorus biofertilizers on soil phosphorus availability، yield and phosphorus absorption of potato (Solanum tuberosum L.) cv. Savalan، a field experiment was conducted based on randomized complete blocks design with three replications in Agricultural Research Center of Hamedan during 2009. Treatments were included: (1) control; (2) 100 kg ha-1 triple super phosphate (TSP)، (3) 200 kg ha-1 TSP; (4) 300 kg ha-1 Golden Biophosphate + 3600 g ha-1 of Thiobacillus; (5) 100 kg ha-1 + treatment four; (6) 300 kg ha-1 Golden Biophosphate and 7200 g ha-1 Thiobacillus; (7) 100 kg ha-1 TSP + treatment six; (8) 5 Lha-1 Biophosphor inoculation (BIS) (Pseudomonas and Thiobacillus); (9) 5 Lha-1 of BIS and 100 kg ha-1 TSP; (10) 10 Lha-1 of BIS and (11) 10 Lha-1 of BIS and 100 kg ha-1 TSP. The results showed that maximum P concentration in tuber (0. 284%)، available phosphorus of soil (26. 6 mg/kg) and yield (67083 kg ha-1) and minimum of soil pH (7. 8) were obtained with 100kg ha-1 TSP and 300 kg ha-1golden biophosphat and 7200 g ha-1 in Thiobacillus treatment. Also 100 kg ha-1 TSP and 300 kg ha-1 golden biophosphat plus 3600 g ha-1 Thiobacillus treatment had highest P concentration of leaves (0. 3 %)، dry matter of tuber (24 %) and stem height (82 cm). Lowest amount of yield، tuber، leaves and soil phosphorus and stem height and highest rate of soil pH (8. 26) was resulted in control treatment. In general، to achieve the optimum growth of potato in similar soils، application of 100 kg ha-1 TSP and 300 kg ha-1 golden biophosphat plus 3600 g ha-1 Thiobacillus could be recommended.