摘要
连续 2 0d观测不同育苗方法培育 4 5叶龄烟苗苗床的热量状况 ,结果表明 ,大棚内有效积温比大棚外高 51 3%。大棚内土床比棚外土床有效积温高 51 8%。漂浮育苗以塑料棚作设施 ,为苗床环境创造了较好的温热条件。与同一塑料大棚内土床比较 ,漂浮床有效积温高 12 6% ;与大棚外盖松针再盖地膜的土床比较 ,虽然漂浮床日均气温减少 1 1℃ ,但盖松针再盖地膜土床的地温日较差高于漂浮床 ,地膜内气温平均日较差高达 11 7℃ ,不利于烟苗生长 ,成苗期比漂浮育苗推迟 7d。大田对比试验结果 ,漂浮苗 7个试验点增产幅度 8 5%～ 2 7 3% ,公顷产值增 1494 3～770 7 4元 ,平均提高上等烟比例 9 3个百分点 ,平均提高中上等烟比例 6 5个百分点。初步认为漂浮床热量积累与分布的合理性 ,是漂浮法培育壮苗的重要原因。
The thermal status of flue cured tobacco seedling production with different methods was observed during continuous 20 days.The results showed that the effective accumulated temperature inside plastic shed was 51.3% higher than that of conventional seedling bed outside.The plastic shed of float system supplied better temperature and thermal conditions.The effective accumulated temperature of float bed was 12.6% higher than that of soil bed inside the same plastic shed.Although average daily temperature of float bed was 1.1 ℃ lower than that of soil bed covered with pine needles and re covered with plastic film,the latter’s daily temperature difference was higher,it reached 11 7 ℃,and it was unfavorable for seedling growth,time of seedling desired was delayed 7 days.Field test results showed that the yield of float system increased by 8 5% 27 3%,value increased 1 494.3 7 707.4 yuan,rate of high class leaf increased 9.3 percents,rate of high middle class leaf increased 6.5 percents.The advantage of heat accumulation and distribution of float bed was the important factor to produce good seedlings with float system.
出处
《中国烟草科学》
CSCD
2000年第2期20-22,共3页
Chinese Tobacco Science
关键词
烤烟
漂浮育苗
活动积温
有效积温
热量
大棚
Flue cured tobacco
Float system
Active accumulated temperature
Effective accumulated temperature
