摘要
在陕西关中地区进行田间试验,研究了不同栽培模式、施氮量对夏玉米和冬小麦地上部分氮素的累积、分配和利用效率的影响。结果表明:垄沟栽培模式显著增加了成熟期夏玉米的氮素累积总量及各个器官的氮素累积量,其余处理下成熟期夏玉米和冬小麦的氮素累积量差异未达显著水平;不同栽培模式下,小麦的各器官除叶片的氮素累积量差异达显著外,其余器官的氮素累积量均未达到显著水平;不同栽培模式下,小麦各器官对子粒氮素的贡献为垄沟>常规>覆草>控水;与不施氮肥相比较,施氮处理(N120kg/hm2和N240kg/hm2)显著增加了作物氮素累积量;两个施氮肥水平相比,高氮处理显著提高氮素累积量,但小麦花后营养器官氮素向子粒转运和分配两个水平间无显著差异;随着氮肥用量的增加,氮肥利用效率和氮肥农学效率均呈现降低趋势。
A field experiment was conducted in the Guanzhong region of Shaanxi Province to study the effects of different cultivation patterns and N fertilization on the accumulation,partition and use efficiency of N in maize and winter wheat rotation.The results showed that the furrow planting pattern significantly increased the N accumulation in maize during its mature stage,whereas other cultivation patterns had no significant effects on the N accumulation in the maize and wheat.Different cultivation patterns had significant effect on the N accumulation in leaves of wheat,while had no effects on other organs of maize and wheat.The contribution of N from different organs to grain increased in the order： furrow planting conventional straw mulching water-controlled.Applying N fertilizer（including N 120 kg/ha and N 240 kg/ha）increased the N accumulation in the crop in comparison with the control.The N accumulation in treatment of N 240 kg/ha was significantly higher than that of N 120 kg/ha treatment.However,there were no significant differences in the N translocation from different organs to grains and partition between the two N fertilizer treatments during the anthesis stage.As the increasing of N fertilizer rates,the N use efficiency and N agronomic efficiency decreased.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2011年第1期1-8,共8页
Journal of Plant Nutrition and Fertilizers
基金
国家自然科学基金重点项目(30230230)
国家"十一五"科技支撑计划课题(2008BADA4B09)
西北农林科技大学拔尖人才支持计划(2006)项目资助
关键词
栽培模式
施氮量
氮素累积
氮肥利用效率
cultivation patterns
nitrogen fertilizer
nitrogen accumulation
nitrogen use efficiency
