不同有机营养液对烟苗生长发育及生理特性的影响

为了寻找来源广、取材方便的烤烟有机育苗营养液,采用双因素三水平的试验设计,研究了营养液N质量浓度分别为50、150、250mg/L的育苗专用肥、沼液和鱼蛋白有机液肥对烟苗生长发育和生理特性的影响。结果表明,各肥源50 mg/L N处理的烟苗生长矮小,株高为3.99～11.34cm,150mg/L N处理的烟苗长势最好,株高为16.95～17.61cm。沼液150mg/L N处理烟苗地上部长势较好,株高为16.95cm,接近常规育苗肥效果,根鲜、干质量分别为0.79、0.07g/株,根系活力为307.36U/(g.h),高于常规育苗肥和鱼蛋白有机液肥处理;鱼蛋白有机液肥150mg/L N处理烟苗株高为17.61cm,但根系活力最弱,仅为163.70U/(g.h),烟苗光合色素含量和净光合速率均低于沼液处理。综合分析,沼液150mg/L N处理的烟苗生长最好,可考虑用于烟草有机育苗。

Effects of Different Organic Nutrient Solutions on Growing Development and Physiological Characteristics of Flue-cured Tobacco Seedlings

For organic tobacco production it is very important to find out an organic nutrient solution which confers a widely available and convenient source in floating-seedling system.To determine the effects of fertilizer and nitrogen concentrations on growing development of flue-cured tobacco seedlings,the experiment was designed with three fertilizers(conventional fertilizer,biogas slurry and fish protein hydro-organic fertilizer) and three N concentrations(50,150,250 mg/L).The result showed that the tobacco seedlings were small and short under the N concentration of 50 mg/L,about 3.99-11.34 cm in height.But when the N concentration increased to 150 mg/L,the tobacco seedlings grew well,with height of 16.95-17.61 cm.The biogas treatment(150 mg/L N) improved the development of tobacco seedlings,conferring an average height of 16.95 cm.Their dry and fresh weights of one root were 0.07 g and 0.79 g,and the root activity was 307.36 U/(g·h).Applied by fish protein hydro-organic fertilizer(150 mg/L N) the tobacco seedlings grew well,but the root activity decreased to the lowest,163.70 U/(g·h).Interestingly,the photosynthetic pigments content and photosynthetic rate in the treatment of fish protein hydro-organic fertilizer were lower than those under the biogas slurry treatment.Consequently,the growth and development of the seedlings under the biogas slurry treatment of 150 mg/L N was best,which could be used in the organic floating-seedling system.