Thank you Steven, It all makes sense to me now. Ina Ina Crossley Auckland New Zealand Zone 10 On 27/02/2013 5:24 p.m., steven hart wrote: > Hi Ina, > ppm means parts per million... I personally don't like intensive > fertilizing strategies, too hard with a plant that flourishes in our > conditions anyway, many people get it slightly wrong because, such a > recommended dose rate often fails to consider environmental > circumstances.... Temperature, rainfall, soil acidity etc, so for example > if you & someone in California & my self all used the same dose rate we > would all have a different growth rate result.... With some species, you > would also have to consider, that they may need seasonal fluctuations in > mineral uptake to spark the flowering cycles.. Sometimes you may achieve a > wonderful growth rate, by stringent fertilizing, but may sometimes reduce > flowering rates too..... > If you use the analogy of hydroponics, there you see plants growing at > optimum rates but only if the chemicals are carefully measured to the ppm, > even small fluctuations in chemical rates can be detrimental to the plants > & crops can be quickly lost through under or over feeding over very short > time periods..... > > Hope that helps Ina > Steven > > > On 27 February 2013 13:38, Ina Crossley <klazina1@gmail.com> wrote: > >> I was reading an article which was about scientific writings which >> included Zephyranthies >> > >> What does 150 >> ppm N mean? I know that would be nitrogen, but how would one know that >> quantity? >> >> Ina Crossley >> Auckland New Zealand zone 10a >> >> _______________________________________________ >> pbs mailing list >> pbs@lists.ibiblio.org >> http://pacificbulbsociety.org/list.php >> http://pacificbulbsociety.org/pbswiki/ >> > >