بررسی و برآورد پتانسیل عملکرد ذرت دانه ای قبل از برداشت

In order to preharvest determination of maize yield potential (cultivar ksc704) in various areas of Kermanshah province, 25 maize fields selected in four locations including Mahidasht, Biston, Ravansar and Sarpolzahab. Sampling from selected fields was done befor tasseling and dough stages, and yield potential predicated by using estimation formula.
All desirable data such as planting date, using seed, fertilizer and pesticide, plant height, stem diameter , leaf length and width and number of leaf were recorded during growth season. The yield and it components were determined by sampling at physiological maturity stage. The final yield of farms was recorded as reported by farmers. The yield of fields estimated at flowering and milk dough stages by related formula and compared with real yields. The results showed the yield is not predictable at flowering stage and had a high different with real yield, while the estimated yield at milk dough stage show a hight correlation (R=0.86) with real yield. The path analysis of data showed ear weigh, ear number per m and leaf width had major role in grain yield and entered in step by step model.