啤酒大麦产量与籽粒品质的综合栽培效应

研究了5个栽培技术因素对啤酒大麦产量、粒重和蛋白质含量3个主要生产指标性状的综合效应。结果表明：适期早播（10月13日-11月2日）、增加基本苗密度（6-22万/亩）、等量氮肥早施对籽粒产量有正效应，而对粒重和蛋白质含量有负效应；施氮量（20kg/亩以下）增加，产量和蛋白质含量都提高，粒重表现二次反应；基追氮肥比例的作用较不明显，仅有微弱的效应。不同条件下，产量与粒重均负相关；产量、粒重与蛋白质含量之间的相关因所考虑的因子而定。各个因子的综合效应大小依次为：施氮量＞播期＞施氮时期＞基本苗密度＞基追氮肥比例。

MULTIPLE-EFFECTS OF CULTURAL FACTORS ON THE YIELD AND GRAIN QUALITY OF MALT BARLEY

In a study of the effects of 5 cultural factors on grain yield (GY), 1000-grain we-ight (GW) and grain protein content (GP) of malt barley in 1982-1986, early sowing(in Oct. 13-Nov. 2) ensured a seedling population of 60-220 thousands/mu. Early N app-lication affected GY positively but had a negative effect on GW and GP. GY and GPincreased with the increasing rate of N application within the limit of 20kg/mu. GWshowed a quadratic response to applied N. The ratio of base-topdressing N had insigni-ficant effects on GY, GW and GP.GY was negatively correlated with GW under vari-ous conditions, whereas, the correlations among GY, GW and GP depended on the re-latted factors considered. The effects of the 5 factors on GY, GW and GP were in thefollowing order: N application rate >sowing date>time of N application >seedling po-pulattion ratio of base-topdressing N fertilizers.