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对福引79-9、福引82-41和闽糖70-611三个品种分别施以不同量的氮肥后,各品种的+1叶硝酸还原酶活性(NRA)与+3叶含氮量的变化规律极其相似,不施氮处理的+1叶NRA和+3叶含氮量随蔗株株龄的增长而持续下降;施氮处理在施肥后几天,+1叶NRA和+3叶含氮量逐渐上升至最高峰,以后则随株龄的增长而下降。从施氮后+1叶NRA和+3叶含氮量出现最高峰起,各时期的+1叶NRA和+3叶含氮量的高低顺序(除闽糖70-611 9月11日Nl的+3叶含氮量略高于N2外)为施氮多的处理>施氮少的处理>不施氮的处理。3个品种3种施氨水平下的+1叶NRA与+3叶含氮量均呈极显著正相关。可见,+1叶NRA与+3叶含氨量一样能反映出蔗株的氮素营养状况。但+1叶NRA因品种和株龄而有很大变化,不适用于氮素营养诊断。
After fertilizing three different fertilizers (Fuyin 79-9, Fuyao 82-41 and Fujian sugar 70-611) with different amounts of nitrogen fertilizer, the changes of NRA and +3 leaf nitrogen content The rules of NRA and +3 leaves in the leaves without nitrogen application continued to decrease with the increase of plant age. In the days after fertilization, NRA and +3 leaves with + 1 leaf nitrogen The amount gradually rose to its peak, but then decreased with the growth of the age of the children. From the highest peak of NRA and +3 leaf nitrogen content after nitrogen application, the nitrogen content of NRA and +3 leaf in each leaf increased in the order from top to bottom (except Fujian sugar 70-611 Nl on September 11 +3 leaf nitrogen content slightly higher than N2) for the treatment of nitrogen> treatment less nitrogen> nitrogen-free treatment. There was a significant positive correlation between NRA + 3 leaf nitrogen content and 3 leaf N + Visible, + 1 leaf NRA and +3 leaf ammonia content can reflect the same nitrogen status of sugarcane plants. However, the +1 leaf NRA due to the variety and age have greatly changed, not suitable for nitrogen nutrition diagnosis.