Effect of soil applied encapsulated calcium carbide on growth and yield of rice (Oryza sativa L.).

摘要

A field experiment was conducted in Faisalabad, Pakistan, in 2004 to evaluate the effect of encapsulated CaC2 on growth and chemical composition of rice cv. Basmati 385. The encapsulated CaC2 applied alone or along with chemical fertilizer significantly increased early emergence of panicle, number of tillers and rice yield. Soil amended with encapsulated CaC2 resulted in a 20 increase in rice yield over NPK fertilizer alone. Plant analysis also indicated that encapsulated CaC2 promoted N concentration and uptake by plant, which is supported by the reduced oxidation of applied fertilizer NH4+ to NO3- in the presence of encapsulated CaC2. It is plausible that CaC2 might have affected growth and chemical composition of rice by acting as a nitrification inhibitor and/or as a source of ethylene..