بررسی تاثیر کود و وجین علف‌های هرز بر تولید بذر یونجه همدانی

In order to study of phosphor & potassium elements, and also weed control effect on seed yield of alfalfa ecotypes a split split plot design based on randomized complete block design with 3 replications was carried out in Mashhad for three years from 2006. Main plot was 18 alfalfa ecotypes, sub plot were fertilizer application & non application and weed free and weedy substituted as a sub sub. Number of pod per plant, number of seed per pod, weight of pod, 1000 seed weight & seed yield were investigated by analysis of variance. Results showed that effect of weeding and fertilizers application on all of traits investigation were significant. Interaction between weeding × fertilizer was significant in all traits exception pod per plant & 1000 seed weight. Weeding × ecotype interaction was significant in seed per pod, weight of pod & seed yield. Three way interaction only on pod & seed yield was significant. Seed & pod yield in fertilizer and weeding treatments compare to weedy and non application fertilizer were the most in all ecotypes. Sedighian ecotype had the most producing 388.8 kg/ha and 217.0 kg/ha pod & seed yield and had significant difference with Shorcut ecotype by the least 241.7 kg/ha & 134.3 kg/ha in above traits mention respectively.