Study of Sowing date, Super phosphate triple and Zinc sulfate on Quantitative Yield of Annual Medics (Medicagoscutellata cv. Robinson) in Summer Cropping

In order to evaluate of sowing date and fertilizers, super phosphate triple and zinc sulfate on quantitative yield of annual medics (Medicago scutellata cv. Robinson) in summer cropping, an experiment was conducted as split factorial arranged in completely randomized block design (CRBD) with four replications in crop season 2011-2012 research farm of agriculture faculty of Lorestan university in Khorramabad. The main factor was the sowing date in two level T1: (20th June) and T2: (16th July) and the sub factor was fertilizer super phosphate triple in three levels (P0=0, P1=150 æP2=250 kg.ha-1) and fertilizer zinc sulfate in three levels (Zn1=0, Zn0=50æ Zn2=100 kg.ha-1). The results showed that, triple interaction effects of sowing date, super phosphate triple and zinc fertilizer on the biological yield and 1000 seed weight were significant in 0.01 probable levels. Also triple interaction had significant effect on seed yield and harvest index in 0.05 probable levels. The mean comparison of the triple interactions on the biological yield showed that the highest biological yield (3504.6 kg.ha-1) was obtained in (T2P1Zn1). Therefore it is recommendable treatment in the annual medic to production of dry forage. Also the mean comparison of effects showed that highest seed yield (807.9kg.ha) was obtained in (T2P2Zn1) and lowest seed yield obtained in (T2P1Zn0). Therefore treatment (t2p1zn1) recommendable for production of dry forage and production seed treatment (T2P2Zn1) recommendable.