عنوان مقاله [English]
In order to study irrigation frequency and plant density of Kochia (Kochia scoparia), Quinoa and forage sorghum, a field experiment was conducted during 2015 and 2016 at Salinity Station. The experiment was laid out in a randomized complete block design in form of split plot factorial experiment and replicated four times. At this research effects of irrigation frequency at four levels (irrigation after 5, 10, 15 and 20 days), and plant density at three levels (11.1, 16.7 and 33.3 plants per m2) on Koshia (Birjand and Sabzevar bulks), Quinoa (Santa Maria and Sajama Iranshahr) and verities of KFS3 and Speedfeed sorghums were investigated. Results showed that; Variety of quinoa Santa Maria had the most water content. Sabzevar bulk at irrigation every 5 days interval and 33.33 plants per m2 with dry yield of 7.64 ton ha-1 had the highest yield and yield components of dry yield of forage. Interraction effects results showed that; with increasing plant density and irrigation on time until plant density of 333000 plants per hectare koshias and quinoas dry matter increased but this increasing for forage sorghum accurse till plant density of 167000 plant ha-1. Sabzevar bulk at irrigation every 5 days interval and 33.33 plants per m2 with yield of 33.99 ton ha-1 had the highest yield. The suitable treatment of quinoa was Santa Maria at irrigation every 5 days interval and 16.7 plants per m2 with dry yield of 4.37 ton ha-1 had the highest dry yield and KFS3 at the same plant density and irrigation frequency with yield of 3.3 ton ha-1 had the less ranking. Intrection effects of treatments showed, Sabzevar bulk of koshia at irrigation every 5 days interval and 33 plants per m2 with yield of 34 ton ha-1 had the highest fresh forage yield.