摘要
为了明确裸燕麦的最适播种时期,研究了5种播种时期对裸燕麦生物学特性和产量的影响。结果表明,随播期推后,裸燕麦的分蘖力逐渐减弱,株高降低,干草产量亦随之下降。随着播期推迟,裸燕麦整个生育期也必然后延,灌浆期相应缩短,花后干物质对籽粒的贡献率越来越低。穗粒数和公顷穗数显著减少,籽粒产量呈下降趋势。气候因子中日照时数对籽粒产量影响最大,≥0℃积温次之;在其它因子不变的情况下,积温每增加1℃.d,籽粒产量增加1.517 kg/ha;日照时数每增加1 h,籽粒产量增加4.176 kg/ha;而降雨量每增加1 mm,籽粒产量减少1.629 kg/ha。本试验条件下,为保证灌浆顺利进行和完全成熟,吉林白城地区裸燕麦播期最好选择在4月上旬。
Sowing date is an effective measure for regulating growth, development and harvest period of naked oat. Field experiments were conducted in Baicheng Academy of Agricultural Sciences to investigate the effects of different sowing dates on the biological characteristics and yield of naked oat in 2006-2007. The results indicated that with the sowing dates postponed, tillering ability of naked oat weakened gradually,plant height and hay yield decreased,too. The growth stages of naked oat were postponed consequentially,grain filling stage shortened,the biomass after anthesis converting to grain decreased, grain number per spike and spike number per hectare decreased significantly, and grain yield decreased. Among climatic factors the sunshine duration had a great effect on grain yield,followed by also≥0℃ accumulated temperature. If other factors were constant,increase of 1 ℃·d of accumulated temperature increased grain yield by 1. 517 kg/ha; increase of 1 h of sunshine duration increased grain yield by 4. 176 kg/ha. However, increase of 1 mm of precipitation reduced grain yield by 1. 629 kg/ha. Under the condition of this experiment,to make sure grain filling smoothly and completely mature,the naked oat had better to be sowed in the beginning of April.
出处
《麦类作物学报》
CAS
CSCD
北大核心
2008年第3期496-501,共6页
Journal of Triticeae Crops
基金
国家“十一五”科技支撑计划项目(2006BAD15B02)
