Paper Title
The Effect Of Biological Phosphate Fertilizers On Weed�s Occurrence And Characteristics

The effect of phosphate bio-fertilizer on occurrence of the dominant weeds in wheat field was investigated in a 5�3 factorial experiment in a randomized complete block design with 3 replications. The first factor, fertilizer, comprised of five levels, super phosphate triples 0, 100 and 200 kgha-1 as chemical fertilizer and Barvar 2 and 3 100 gha-1 as bio-fertilizer, and the second factor, cultivar, comprised of Shiraz, Marvdasht and Bahar. Results indicated that the bio-fertilizer application reduced Hordeummurinum, Cardariadraba, Stellaria media, Alopecurusmyosuroides, andLamiumamplexicaule occurrence, but increasedCirsiumarvensisand Lactucaserriola. In addition, Bahar cultivar had better competition with weeds compared to the other cultivars. Therefore, bio-fertilizer application and Bahar cultivar are recommended for the similar regions.Results of field study were supported by greenhouse researches. The greenhouse trials demonstrated that weed�s height, seed fecundity and seed rainin biological fertilizer treatmentshad significant difference with control and chemical fertilizer treatments. Key words- Bio-fertilizer, weed, nutrient uptake, competition, weed management