Assessment of year and location effect on crimson clover forage yield and others clover spcies

Lotfollahian، In order to assess of year and location effect on forage production of crimson clover and others clover species in different planting dates، an experiment was carried out with 12 treatment، with four replications in RCBD at Karaj، Dezfoul and Isfahan regions. In this study planting dates were considerd as main plot in four levels (d1= 23 Aug.، d2= 6 Sep.، d3= 23 Sep.، d4= 7 Oct.) and clover cultivars as subplot in three levels (v1= Crimson clover، v2= Berseem clover، v3= Persian clover). The results of combined analysis of experiment demonstated that effects year، location، year x location، planting date، year x planting date، location x planting date (except dry matter yield)، year x location x planting date، species، year x species، location x species، year x location x species، planting date x species، year x planting date x species (except fresh yield)، location x planting date x species and year x locationg x plant date x species were significant different for fresh، dry matter yield and plant height. Mean comparison of treatments showed that Karaj region with 65. 07 Tha-1 forage yield and 12. 51 Tha-1 dry matter yield، 23 Aug. planting date with 66. 43، 11. 90 Tha-1 and 50. 66 cm plant height and berseem clover species with 79. 49، 15. 26 Tha-1 and 68. 30 cm were the best treatment from view forage and dry matter yield respectively. Meanwhile mean comparison of the interaction planting date x species showed that d2v2 with 82. 73 Tha-1 fresh yield، 16. 99 Tha-1 dry matter yield and 71. 29cm plant height were the best treatments.