施氮对紫花苜蓿生长特性的影响

Effects of different nitrogen levels on alfalfa productivity in different growing years

通过随机区组试验,研究了不施氮(N0)、施氮51.75kg/hm2(N1)和103.5kg/hm2(N2)3个氮水平对"甘农3号"紫花苜蓿生长第1年及第2年产量和再生性能的影响。结果表明:"甘农3号"紫花苜蓿生长第2年产量显著高于第1年,在N2处理下两年干草产量均最高,第1年为14 717kg/hm2,第2年为31 092kg/hm2;从株高和再生速度看,两年均以处理N2下紫花苜蓿的再生性能最强,并且第2年的明显优于第1年。综上,试验区"甘农3号"紫花苜蓿在N2处理下再生性能最好,株高和产量达最高,且两年均能进行4次刈割。

By using randomized block plot design,the effects of 3 levels of nitrogen （N0,control;N1,5 1.75 kg N/ha;N2,103.50 kg N/ha）on the yield in first year and the growth and regeneration in second year of alfal-fa （Medicago sativa cv.Gannon No.3）were studied in Lanzhou in 2012 and 2013.The results showed that the yield in second year was significantly higher that that in first year.The yield under N2 treatment was the highest （14 717 kg/ha in 2012 and 31 092 kg in 2013）.The plant height and regeneration performance was also the best under N2 treatment.