Nerine sarniensis

Alberto Castillo
Mon, 07 Nov 2005 17:01:48 PST
Dear all:

           Mary Sue and Lyn raised an interesting point. Perhaps we should 
abandon the concept of tomato fertilizer (in the English sense) meaning a 
fertilizer low or very low in nitrogen and high in potassium. Bananas, 
tomatoes, bulbs of all sorts, African violets, etc. are all plants that take 
important quantities of potassium from the media or soils. Perhaps it is too 
simple to mention tomato fertilizers for them. High potassium would be 
           Chlorides are toxic to most plants. Its curious effect on tobacco 
is what makes most fertilizers have potassium in some other form.
           Again, muriate of potash (K2SO4) is the same as potassium 
sulphate (K2SO4) and contains no chloride in any form (or it would be a 
chloride instead of a sulphate!).
           Sea water is toxic due to the sodium (besides the Cl).
           While information from great experts like John Lonsdale or Jane 
McGary are based on an enormous amount of practical experience, I must 
mention that although his comments on virus manifestations related to stress 
are 100% true and undisputable it is also true that a hygiene program and 
the continuing production of plants from seed minimizes virus incidence to 
very low rates. There exist nurseries that excel in the production of virus 
free material, Dirk Wallace for instance. Another case is that Rust-en-Vrede 
in South Africa, run by Dr Alan Horstmann: I have grown tenths of species 
from them obtained as bulbs and corms and in over a decade NEVER EVER a 
single virus case appeared in his plants. Of course there are other bulb 
firms producing superb material but there are others that amply distribute 
heavily virused material. As John says so well, these show up under stress 
(like changing hemispheres). So, always maintain newly introduced material 
in a separate spot and very carefully watch the development of new foliage: 
it is most often at their tips that viruses show up, then becoming masked 
and acting as dangerous carriers.


MSN Amor: busca tu ½ naranja

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