بررسی تأثیر روش‌های مختلف تغذیه فسفره بر عملکرد غده‌های بذری سیب‌زمینی

In order to study the yield and size distribution of potato seed tubers under different methods of phosphorus (P) nutrition, a factorial experiment based on RCBD (Randomized Complete Block Design) with four replications was conducted in the spring 1391. Treatments included the amount of P fertilizer (0, 37 and 74 kg/h), the source of P fertilizer (MAP, DAP and SP), the time of P application (strip application at planting stage and top-dressing).Variables such as number, yield and size of seed tubers were evaluated in potato plants. Results showed that only the amount of P fertilizer out of studied factors, could significantly affect the number of tuber per plot. So the minimum level of P fertilizer (37 kg/h net P) caused tuber number to increase from 64.25 to 92.29. Seed tuber number (28-65 mm) and seed tuber weight in DAP treatment were significantly higher than two other fertilizer treatments. No-application (Control) treatment resulted in the lowest seed tuber in weight and number. It is determined that the lowest amount of P fertilizer (37 kg/h) caused significant increase in seed tuber number.