بررسي تاثير مصرف مقادير مختلف پتاسيم و روي بر عملكرد و اجزاي عملكرد سويا در منطقه مازندران

Effects of different potassium and zinc applications on yield and yield components of soybean ( Glycine max L.) in Mazandaran province

In order to study the effects of potassium and zinc applications on yield and yield components of soybean (Glycine max L.) cultivar BP692, a field experiment was conducted at the Summer 2001 in Mazandaran, Babolsar (Bahnamir district) on a calcareous loamy soil. Four levels of potassium (0, 75, 150 and 225 Kg/ha potassium sulfate) and four levels of Zinc applications (0, 10, 20 and 30 kg/ha zinc sulfate) were compared in a factorial experiment based on a randomized complete block design with four replications. All of the treatments were added to the soil before the sowing. Results showed that the levels of potassium fertilizer had a significant effect (p < 0.01) on yield and number of pod per plant. It had also a significant effect (p < 0.05) on thousand seed weight. The effect of zinc fertilizer and interaction between the different levels of potassium and zinc applications were not significant on yield and yield components. The comparison of means (by Duncanʹs Multiple Range Test) indicated that the highest yield (2962.5 Kg/ha) and thousand seed weight (146.6 gr) were obtained by applying 225 Kg/ha potassium sulfate, but a significant difference among 75, 150 and 225 Kg/ha potassium sulfate on yield was not observed. Also difference between 150 and 225 kg/ha potassium fertilizer was not significant on thousand seed weight. Application of 75, 150 and 225 kg/ha potassium fertilizer increased the number of pod per plant significantly without any significant difference among them.