施氮量及施氮方式对‘临草2号’干物质积累及鲜干草产量的影响

Effect of N Application on Dry Matter Accumulation,Fresh and Dry Yields of 'Lincao 2'

研究大田条件下施氮量和施氮方式对‘临草2号’干物质积累及鲜干草产量的影响。结果表明,施氮使‘临草2号’干物质积累量和鲜干草产量明显增加,且随施氮量增加干物质积累量和鲜干草产量呈增加趋势,施氮量在300kg/hm2时,鲜干草产量最高,氮肥利用效率最高,再增施氮肥干物质积累量和鲜干草产量变化不明显;施氮量相同时,氮肥采用70%基施+30%追施比一次基施更有利于‘临草2号’干物质积累,提高鲜干草产量。因此,在施纯氮300kg/hm2基础上,氮肥采取70%基施+30%追施,可实现‘临草2号’高产高效栽培。

Effect of N application on dry matter accumulation,fresh and dry yields of ＇ Lincao 2 ＇ were studied under field experiment.The results showed that,dry matter accumulation,fresh and dry yields of ＇ Lincao 2 ＇ were increased with N application rate.＇ Lincao 2 ＇ had the highest fresh and dry yields,and N fertilizer had the most use efficiency when N application rate was 300 kg/hm 2.Dry matter accumulation,fresh and dry yields changed little at more N application rate.70% N as basal and 30% N drop dressing at jointing stage was favorable for dry matter accumulation,fresh and dry yields increasing of ＇ Lincao 2 ＇ than all N as basal,when at the same application N rate.High yields and high efficiency cultivation of ＇ Lincao 2 ＇ could be realized under N application at 300 kg/hm 2（70% basal and 30% top dressing at jointing stage）.