Evaluation the effects of biological phosphorus fertilizer and weed control on agronomic characteristics and yield of corn (S.C. 704) in Koohdasht, Lorestan Province

In order to study the effects of weed control and biophosfate fertilizer barvar-2 (contain phosphate solubilizing bacteria) on agronomic characteristics and the yield of corn (Zea mays L.) S.C. 704, a factorial experiment based on randomized complete block design was conducted with three replications in Koohdasht, Lorestan in the spring of 2012. The first factor was three weed control methods, including 1- Chemical control with Foramsolfuron 450 g ai/ha-1 (2 lit/ha-1), 2- two times weeding, 3- weedy check (without any control) and the second factor was three type of fertilizers, including 1- biophosfate fertilizer (barvar-2 phosphate), 2– common fertilizer (NPK based on soil test), and 3- A combination of both types of fertilizers. In this study LAI, plant height, stem diameter, biological and grain yield of corn were measured. The results showed that with exception for stem diameter, effect of different levels of weed control and fertilizers was significant on growth characteristics and grain yield. The highest and lowest corn grain yield obtained in double weeding+biofertilizer application (18317 kg/h-1) and weedy check + common fertilizers treatments (7611 kg/h-1), respectively. The result also showed that grain and biological yield of corn, were decreased amount 55 and 29 percent by weed infected compare to weed control. The use of bio-phosphate fertilizer increased corn grain yield by 19% when compared with common fertilizer.