N素水平对13-5171-7青稞生长及氮肥利用率的影响

Effects of Nitrogen Supplying on Growth and Nitrogen Use Efficiency of 13-5171-7 Highland barley

为了解N素水平对春青稞新品系13-5171-7生长的影响,设计了6个N素施用水平处理,并分析了青稞分蘖状态、株高、不同生育期生物积累等指标,结果标明:(1)增施N肥13-5171-7的分蘖率和成穗数较CK处理有不同程度增加;(2)施N处理13-5171-7株高高于CK处理,尤其是拔节到孕穗是植株生长最快的时期,施用N肥能补充和满足青稞生长对营养的需求;(3)13-5171-7随生育期推进植株生物量累积速率随N素水平增加先增加后降低;(4)13-5171-7产量随N素水平增加先增加后降低,氮肥偏生产力随N素水平提高而降低,氮肥农学效率随N素水平提高先增加后降低。T3(N:7 kg/666.7 m^(2))处理13-5171-7分蘖率较高,成穗率最高,产量和氮肥农学效率最高,可以在生产中推荐使用。

To understand the effect of N supplying on the growth of new spring Highland barley 13-5171-7,six N application treatments were designed.The tillering status,plant height and bioaccumulation at different growth stages had been analyzed.The results showed that(1)tillering rate and panicle number of 13-5171-7 supplying N treatments were increased in different degrees compared with that of CK treatment;(2)The plant height of 13-5171-7 supplying N treatments were higher than that of CK.Especially at the period of elongation stage to booting stage,when barley grows fastest,supplying N can meet the nutrition demand of barley growth;(3)The biomass accumulation rate of 13-5171-7 first increased and then decreased with the increase of N levels;(4)The yield and agronomic efficiency of applied N(AEN)of 13-5171-7 first increased and then decreased with the increase of N levels.Otherwise,partial factor productivity of applied N(PFPN)of 13-5171-7 decreased with the increasing of N supplying.The conclusion was that 13-5171-7 in T3(N:7 kg/666.7 m^(2))treatment which had higher tillering rate,highest panicle rate,highest yield and AEN,could be recommended in production.