EFFECT OF RATE AND TIME OF CALCIUM CARBIDE APPLICATION ON NITROGEN USE EFFICIENCY OF APPLIED UREA AND GROWTH OF WHEAT

摘要

Different doses of Calcium carbide (CaC_2) were tested at various growth stages of wheat (Triticum aestivum L.) with and without nitrogen fertilizer (urea) in a pot experiment. CaC_2 was applied @ 15, 30, and 45 mg kg~(-1)soil with N fertilizer @ 60 mg kg~(-1) soil at sowing, one, two and four weeks after sowing. Number of tillers, grain yield and N uptake were significantly improved by the application of CaC_2 plus NPK compared to fertilizer alone and control. Reduction in plant height while increased tillering were observed as inhibitory and stimulatory effects of Calcium carbide. Maximum number of tillers, grain yield and N uptake were observed by the application of 30 mg CaC_2 kg~(-1) soil with N fertilizer. Results indicated that application of 30 mg kg~(-1) among doses of CaC_2while two weeks after sowing among time of application of CaC_2 were found better than all other treatments.