摘要
采用东北三省73个气象站1971～1995年4月上旬至10月下旬的旬平均气温与9～10月逐日最低气温以及玉米分期播种资料 ,分析和验证了玉米各发育期的热量指标。种子萌发的生物学下限温度为8℃ ,萌发至出苗期需≥8℃·d有效积温约100℃·d,出苗至抽雄所需的≥10℃有效积温与品种的叶片数(熟型)有关 ;抽雄至成熟期的热量指标以订正后的标准抽雄日至成熟所需≥10℃活动积温来表示 ,成熟期用成熟度达到1的日期来表示。本研究以某一品种80%年份正常成熟的标准来确定该品种的栽培界线。
Using the data of mean decade temperature of the first ten days of Apr. to the last ten days of Oct., daily minimum temperature of Sep to Oct. from 1971 to 1995,and the data of maize planting date, the heat index of maize in various growth stages is calculated. The lowest biological temperature of seed germination is about 8℃. The effective accumulated temperature of ≥8℃ from germination to emergence is about 100℃·d. The effective accumulated temperature of ≥10℃ from emergence to heading is related to the leaves of maize. The index from heading to maturity is expressed by active accumulated temperature of ≥10℃ from the corrected standard heading day to maturity. Maturity data is the day when maturity degree equals to 1.The north planting boundary of different varieties was determined according to the criterion of maturity in 80% of years.
出处
《沈阳农业大学学报》
CAS
CSCD
2000年第4期318-323,共6页
Journal of Shenyang Agricultural University
基金
国家"九五"农业科技攻关项目!96-020 -01-06资助
