Nitrogen Absorption and Utilization Efficiency in Early Hybrid Rice of Fujian Province

The experiments were conducted to evaluate the effects of different levels of nitrogen application amount on early hybrid rice of Fujian province‘Jinyou 2155’and‘T78you 2155’.The results indicated that nitrogen contents in organs of the two cultivars decreased with plant growth and development process;The nitrogen contents,nitrogen accumulation and nitrogen amount from vegetation transfer in different organs of the two cultivars at different growing stages increased with the increase of nitrogen application amount after the transplant;The nitrogen accumulation and nitrogen uptake amount during the period of grain grouting depended more on vegetation in‘T78you 2155’;Nitrogen harvest index and soil nitrogen contribution ratio between two cultivars had no significant difference among different nitrogen treatments.Nitrogen crops physiological efficiency of the two cultivars reduced with the increase of N application amount,while nitrogen fertilizer utilization ratio of the two cultivars showed different changing trend as the increase of nitrogen application.