烟草湿润托盘苗技术研究与应用Ⅱ苗期管理--施肥和空气整根对烟苗素质的影响
STUDY AND APPLICATION OF TOBACCO TRANSPLANT PRODUCTION TECHNOLOGY OF WET-TRAY WITH MEDIA Ⅱ SEEDLING MANAGEMENT-EFFECTS OF FERTIL IZATION AND AIR-ROOT-PRUNING ON THE QUALITY OF TOBACCO TRANSPLANTS
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摘要: 通过6种肥料浓度处理和育苗盘底部不同处理育苗试验证明：①在营养液纯氮浓度为mg/kg～550mg/kg(NPK比例为1:1:2)范围内，没有出现肥害现象，除个别处理(450mG/kg)外，烟苗地上部分鲜重随施肥浓度的增加而增加，干重则随肥料浓度的增加而降低，根系的鲜重及干重也随肥料浓度增加而减少。综合分析各处理烟苗农艺性状，烟草湿润托盘育苗营养液浓度以150mg/kg～250mg/kg为宜。②空气整根可有效切断烟苗主根顶端且不留伤口，从而促进侧根生长，其根系鲜重和干重比对照增加43.59，和50，。
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关键词:
- 湿润育苗,营养液浓度,空气整根,烟苗素质
Abstract: Tobacco seedlings were nursed on wet-trays supplied with six different concentrations of fertilizer in the range of 50～550 mg/kg,the ratio of NPK being 1:1:2.No fertilizer toxicity was observed. The fresh weight of the tobacco shoots increased and their dry weight decreased as the fertilizer rate increased, except the treatment of 450 mg/kg. The fresh and dry weight ofthe roots dropped with the increase in fertilizer rate.Taking into consideration all the agronomic indexes concemed, 150～150 mg/kg seemed to be the desirable nutrient concentration in the solution.Air root-pruning was effective for cutting the tap- root of the tobacco plants without wound left, thus promoting the growth of the side roots. As a result, the fresh weight and dryveight of the root system increased by 43.59％ and 50％, respectively, as compared with the control. -
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