摘要
以常规粳稻品种9325为材料,研究了大田条件下不同灌溉方式和氮素水平对水稻氮素利用及稻米产量和品质的影响。节水灌溉显著降低了单位面积有效穗数、整精米率、粗蛋白含量以及胶稠度,提高了垩白性状指标和直链淀粉含量,中高氮水平对产量影响不显著;同一灌溉方式下增施氮肥,显著提高了稻米整精米率、粗蛋白含量、垩白米率及垩白度,增加了胶稠度,减少了直链淀粉含量。节水灌溉下氮素干物质生产效率和氮素运转效率提高,氮素产谷效率则对水分反应不敏感;施氮量增加,水稻氮素积累总量及氮素转运效率与施氮量呈单峰曲线关系,随施氮量提高,氮素干物质生产效率、氮素产谷效率及氮素收获指数下降。
The effects of nitrogen fertilization levels on rice grain yield and quality were studied under different irrigation methods by using japonica rice cultivar 9325 as material. Under water saving irrigation, number of panicles per hectare, head rice rate, protein content and gel consistency of rice decreased, while chalkiness values and amylose content of rice increased. As the increase of N level, head rice rate, protein content, chalky grain rate, chalkiness and gel consistency improved, and amylose content decreased under the same water management. Under water saving irrigation, the efficiency of N utilization and translocation after heading increased, while N productivity insensitive to water. It was found that parabolic relationship existed between N applied rates and plant accumulation and translocation in rice. Increasing of N applied rates and N utilization resulted in decreasing N productivity and N harvest index. In addition, grain yield and rice quality were significantly related to variations of N absorption and utilization in respect to water management and N applied rates.
出处
《中国水稻科学》
CAS
CSCD
北大核心
2006年第2期199-204,共6页
Chinese Journal of Rice Science
基金
中荷国际合作项目(节水稻作及稻麦系统研究)
国家863计划专项资助项目(2003AA209030)。
关键词
水稻
节水灌溉
氮素
肥料利用率
产量
稻米品质
rice
water saving irrigation
nitrogen
fertilizer use efficiency yleld
grain quality