EFFECT OF VARIETIES, SOWING DATES AND NITROGEN LEVELS ON YIELD, NUTRIENT UPTAKE AND QUALITY OF DURUM WHEAT (TRITICUM DURUM DESF.)

摘要

A field experiment was conducted on loamy sand soil having low nitrogen, medium phosphorus and potassium status at Research farm. Agricultural Research Station. Durgapura. laipur during two consecutive rabi season in the year 1998-1999 and 1999-2000.The experiment consisted twenty four treatments comprising combination of two varieties (WH 896 and Raj 1555), three sowing dates (1 Novermher, 15 Novermber and 1 December) and four levels of nitrogen (30, 60, 90 and 120 kg/ha) These were evaluated undersplit plot design with three replications, allocating combinations of varieties and sowing dates in main plots. in sub plots N levels were evaluated. Results revealed that recently released variety WH 896 recorded significantly increased in grain and biological yield and their nitrogen uptake over Raj 1555. These varieties did not differ significantly in straw yield. In contrast to yield potential, Var. WH 896 failed to suppress Raj 1555 in quality parameters recorded in terms of grain appearance scoreand β-carotene content At the same time, marginally higher yellow berry prevalence was observed in variety WH 896 compare to Raj 1555. The durums sown up to first fortnight of Nov (1-15 Nov.) significantly enhanced grain, straw and biological yield/haand N uptake closely followed by normal sowing over late sowing. The shift in sowing from 1 Nov. to 1 Dec. reduced sedimentation value of flour, while yellow berr; appearance was least under normal sowing. Grain appearance, hectoliter weight and β-carotene did not vary between sowing dates. Application of N up to 120 kg/ha significantly produced higher grain, straw and biological yield Alike crop productivity. N uptake and quality (grain appearance, hectoliter weight, sedimentation value and β-carotene) of durum grains or flour were improved with each increment up to 120 kg N/ha Whereas, yeliow berry prevalence was least under highest level of N.