Abstract: Under the field experiment conditions,effects of site-specific nitrogen management(SSNM)on grain yield and grain quality of rice were studied.SSNM significantly reduced nitrogen applied rate without any sacrifice in grain yield.When compared with farmers’ fertilizer practice,SSNM increased milling quality and transparency,whereas decreased chalky grain rate,chalky area and chalkiness,leading to an improvement in appearance quality.SSNM also decreased amylose content,gelatinization temperature and protein content,but increased gel consistency.In addition,SSNM increased peak viscosity and breakdown values and decreased setback values,resulting in an improvement in cooking quality.Similar results were obtained from the farmers’ field demonstration.The reason that SSNM improves grain quality was discussed.

Key words: rice, site-specific nitrogen management, yield, rice quality, starch viscosity

摘要： 在大田试验条件下，观察了实地氮肥管理对水稻产量和稻米品质的影响。与农民习惯施肥法相比，实地氮肥管理在水稻产量持平或略有提高的情况下明显降低了施氮量。实地氮肥管理提高了稻米的加工品质，降低了垩白米率、垩白面积和垩白度，提高了稻米的透明度，改善了外观品质；实地氮肥管理还明显降低了直链淀粉含量，提高了胶稠度，降低了糊化温度和蛋白质含量。此外，实地氮肥管理明显提高了米粉的最高黏度、崩解值，降低了消减值，改善了稻米的食味品质。农户示范也取得了类似的结果。对实地氮肥管理改善稻米品质的原因进行了讨论。

关键词: 水稻, 实地氮肥管理, 产量, 稻米品质, 淀粉黏滞性