ارزیابی تاثیر کاربرد منابع مختلف کود فسفر بر برخی خصوصیات اگرومورفولوژیک زنیان (Trachyspermum ammi L.)

In order to study the effects of different phosphorus levels, animal manure and phosphate solubilizing bacteria on yield and yield components of Ajowan (Trachyspermum amii L.) a field experiment was conducted at the Agricultural Research Station of ShahidChamran University in 2010-2011. Trial study was carried out as three ways which assigned as randomized completed block design (RCBD) with three replications. Animal manure at the three levels (M1=0, M2=15 and M3=30 tone/ha) were first factor, different phosphorus fertilizers at the three levels (P1=0, P2=75 and P3=150 kg/ha) were the second factor and the third one were the phosphate solubilizing bacteria at two levels (no bacteria and with bacteria).The result showed that phosphorus fertilizer (75 kg/ha), animal manure ( at the 15 tone/ha) and application of phosphate solubilizing bacteria had significantly positive impact on yield, biological yield, harvest index, plant height, number of seed, seed weight at main umbel and number of seed in sub-umble. It also indicated that combination of animal manure, phosphorus fertilizer and phosphate solubilizing bacteria had significant effect on all traits, except for 1000 grain weight in main umbel. The highest grain yield (227 kg/ha) was obtained 15 tone/ha of animal manure when the plants were not receiving neither phosphorus fertilizer nor phosphate solubilizing bacteria. The lowest grain yield(180.9 kg/ha) was accomplished under 150 kg/ha of phosphorus fertilizer application when no animal manure and no phosphate solubilizing bacteria applications.