Effect of Different Applied Nitrogen Methods on Rice Yield and Nitrogen Utilized Efficiency in Albic Soil

Rice yield and nitrogen utilized efficiency of Albic soil were studied by setting up different plot experiments about applied nitrogen amount,time and proportion at different fertility areas in Heilongjiang Province.The results showed that nitrogen fertilizer had a significant impact on rice growth and development.Compared to one-time applied nitrogen fertilizer,rice yield was increased by 8.9%,income by 1356 yuan hm-2,agronomic efficiency of applied nitrogen(AEN) by 5.1 kg grain per kg nitrogen by using the appropriate amount of nitrogen fertilization and applied nitrogen method.Considering rice production,profit,partial factor productivity from applied nitrogen(PFPN) and agronomic efficiency of applied nitrogen(AEN) aspects into account,soil applied nitrogen fertilizer methods that could make rice high-yield and efficiency in Albic soil are as follows: When the amount of phosphorus and potassium were enough,the amount of nitrogen fertilizer should be controlled at 130-165 kg hm-2 in low fertility areas,and not exceed 130 kg hm-2 in high fertility zone fertilizer,applying forty percent nitrogen fertilizer of total amount before transplant rice seedlings,forty percent during tillering-period,twenty percent fertilization for head sprouting.