The Effect of Different Nitrogen Levels and Enrichment CO_2 on the NutrientContents of Rice Cultivars

摘要

An experiment was conducted during the July -December of 2003 to determine the nutrient compositions of rice under CO_2 enrichment of different levels of nitrogen supply. Rice plants were grown from seedlings to maturity inside open top chamber underelevated CO_2 (570 +-50) ppm, ambient CO_2 (~360ppm) and open field condition. Leaves and root were analyzed for C, N, Zn and Mg. C content was higher in the all plant parts of rice grown at elevated CO_2 compare than ambient CO_2 and field grown rice. Increased N supplies also increase C content of the plants. Nitrogen concentration was reduced in elevated CO_2 compare than other grown condition. Modern variety (BRRIdhan 39) contained higher C than local cultivars (Khaskani and Shakkorkhora). Nitrogenconcentration was decreased under elevated CO_2 compare to other treatments.