施肥对托盘水床育苗基质养分及烟苗生长的影响

托盘水床育苗是把漂浮育苗、北方托盘育苗相结合的一项新技术,研究其育苗基质的养分特征有利于更好地利用施肥来提高成苗素质.分析表明,加肥后,基质和营养液中养分增加明显且pH值显著下降,但在15 d后又恢复到加肥前的水平,这一规律为育苗加肥技术提供了依据.在基质中氮、钾养分呈表层富积的特点,但磷素则为下层基质中积累较多.在供试基质条件下,加肥0.15-0.20g/kg,所育成苗达壮苗要求.

Effect of medium nutrient and seedling growth under fertilization condition in Tray-water-bed systems

The tray-water-bed systems assimilate the merit of the floating systems and the tray systems in the seedling production of the flue-cured tobacco. It is necessary to study the nutrient characteristics under different fertilization condition for improving the seedling quality. The results showed that the nutrient contents increased considerably and the pH value fell down after fertilization but recovered only 15 days later. The nitrogen and potassium accumulated at the surface level, while the phosphorus at the lower level. The fertilization of 0.15-0.20 g/kg could meet the requirement of the vigorous seedling in the tested medium.