摘要
以超级杂交早稻中嘉早17为材料,采用田间试验在施氮量为0、120、165、210 kg/hm24个水平和种植密度为22.5×104穴/hm2(D1)和30×104穴/hm2(D2)2个水平下研究施氮量和种植密度对其氮素利用、积累和转运特性的影响。结果表明,氮素积累总量随施氮量和种植密度的增加而增加,但氮素积累量的增幅随供氮水平的提高而降低,施氮量由120 kg/hm2(N1)上升到165 kg/hm2(N2)的增加幅度,明显大于施氮量由165 kg/hm2(N2)上升到210 kg/hm2(N3)时的增加幅度。叶片氮素转运量也随施氮量和栽培密度的增加而增加,转运率没有明显规律。农学利用率、氮肥偏生产力、收获时氮素生理效率和施肥量间存在负相关。同时发现低密度种植时,氮素农学利用率和收获期氮素生理效率均高于高密度种植。
Nitrogen is one of the most important macro elements;nitrogen use efficiency is affected by variety,nitrogen application level,application method and water management.In this paper,super-hybrid ＂Zhongjiazao17＂ for the material used for the field test to study nitrogen utilization,accumulation and translocation under four different nitrogen fertilizer rates（0,120,165,210 kg/hm2）and two densities patters（22.5×104 and 30×104 hole/hm2）.The results showed that：the total nitrogen accumulation in rice was increased with the amount of nitrogen fertilizer and planting density increased,but the total nitrogen accumulation rate increased was different,when the amount of nitrogen from 120 kg/hm2（N1）to 165 kg/hm2（N2）,the rate was increased significantly greater than the amount of nitrogen fertilizer from 165 kg/hm2（N2）to 210 kg/hm2（N3）.N transfer efficiency of leaf was increased also with the amount of nitrogen fertilizer and planting density increased,N transfer efficiency was no difference among different treatment.Nitrogen agronomic efficiency（NAE）,nitrogen partial factor productivity（NPFP）and physiological efficiency（NPE）positively corrected with plant nitrogen accumulation,we also found that when low-density planting of nitrogen NAE and NPE of nitrogen harvest were higher than high-density planting.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2011年第1期15-20,共6页
Soil and Fertilizer Sciences in China
基金
十一五科技支撑计划项目“长江下游平原双季稻周年超高产模式与技术体系研究”(2006BAD02A13-3-1)
浙江省重大科技计划项目“双季稻1200公斤/亩及超高产农作制度技术集成研究与示范”(2008C02008-1)
关键词
氮肥
密度
超级早稻
氮肥运筹
吸氮特性
nitrogen fertilizer
density
super early rice
nitrogen application
characters of nitrogen uptake
