Studies On Nutrient Regulation And Its Influence Factors Of Substrate Pot New Guinea Impatiens

Through the methods of potting in greenhouse, climate simulating and plant tissue analysis and measuring, the basal growth conditions for substrate pot New Guinea Impatiens were confirmed,the effects of different nutrients levels on the New guinea Impatiens and its influence factors were studied,and the nutrient composition suitable for young plant and fully-grown plant were selected out in this study.The results indicated. (1)The proper substrate composition with peat: vermiculitel :perlitel=2:1: Iwas suitable for the growth of New Guinea Impatiens plants,while the substrate composition with vermiculite:perlitel=l: 1 could be used to the soilless culture of potted New Guinea Impatiens. (2)Although New Guinea Impatiens could grow and develop in nutrition composed 0.031-0.266 gN/L,0.003-0.126gP/L and 0.028~0.315 gK/L, the eflects were different obviously.The critical value inducing salt injury to the plant was among 1.87-2.4g/L.(3)New Guinea Impatiens could grow rapidly when the substrate EC value was 1.054ms . cm-1 ,when the value was above 1.608 ms.cm-1 ,the growth was restrained seriously.(4) 15 000lx was a feasible light intensity for New Guinea Impatien ,surpass or less than it will caused abnormal phenomenon,such as lessening of flower diameter,thinning of flower colour and so on.(5)The growth vigar of plant enhanced with the increasing of nutrient concentrations within 60 days after planting, after then higher nutrient concentrations began to restrain the growth and development.(6)The growth of New Guinea Impatien not only was effected by the fertilizer concentration,but also the EC value of soilless medium which was resulted in the cumulation of salt.7Z)Under different fertilizer level,nitrogen,phosphorus and potassium,had obvious influences on the content of anthocyanin,which was conducted through controlling the synthesis ofsoluble sugar and protein in plant;The PAL activity was affected by the fertilizer,but it hadn' t direct relation with the content of anthocyanin.(8)For New Guinea Impatiens planted in soilless medium composed vermiculitel-perlitel,nutrition containing N2-P1-K1.3 was suitable for the growth of young plants,which could improve the shape of plants, while the composition of N2-P1-K2 was suitable to the fully-grown plants,which could accelerate the bud formation,increase the number of flower and improve the colour of leaf and flower,so the ornamental and commercial qualities were enhanced.