A Survey on the effect of drought stress on quantitative and qualitative characteristics of new varieties of rapeseed

Abstract

In order to investigate the effect of deficit irrigation stress on quantitative and qualitative characteristics of new varieties of rapeseed, an experiment was conducted with three replications on the basis of randomized complete blocks in the split - plot design in four hundred hectares of cultivated farm (2012-2013) in the institute of research on plant and seed's improvement and production in Karaj. In this study, the effect offourirrigation treatmentsatbasic levels(irrigation after40% depletion of soil moisture, irrigationafter 50%depletion ofsoil moisture, irrigationafter 60% depletion of soil moisture, irrigationafter 70% depletion of soil moistureandfourZarfam variety;SLM046 variety;GS003 variety;Hybrid401 Hyolain sublevelswere examined and the interactive effects ofdeficit irrigationandvarietieswere significant at the one and five percentlevelonthe dominantphonological characteristicsincluded;grain yield, biological yield and harvest index. The results showedthat theshortage of consuming watercausedsevere stressonrapeseed, so thatcaused significantdecrease inyield and yield components. In comparison of varieties, it was determined that Zarfam variety and Hybrid 401 Hyola had highertolerance towater shortage conditions that the reason is the highest yieldand yield components. The interactive effects betweenthesetwo factorsshowed that the irrigation treatment on the basis of40%depletion ofavailable water(field capacity) andZarfam variety could allocate thehighest yieldandyield components of seedand percentageofoilto itself and the lowest rates was achieved ofirrigation treatmentbased on70% depletion ofavailable waterandSLM046variety.