Amorphophallus-Forum.de

Hallo,

seit gestern habe ich mich mit dem Thema Dünger beschäftigt, es gibt hier im Forum eine Diskussion über mehrere Seiten dazu, in dem überwiegend Dünger mit NK hoch und P niedriger, oder ausgeglichene NPK-Dünger empfohlen werden.

In der "offiziellen" Kulturanleitung der IAS wird ein starker P-betonter Dünger (15-30-15) empfohlen, für starkes Knollenwachstum.

Zitat von »International Aroid Society«

Fertilizing:
Group I species, when grown in a rich and heavy soil, do not need fertilizer
very frequently, i.e. once in a month may be more than enough. Group II
species however must be fed extra when the soil is indeed loose and contains
only organic matter. However, do not give a concentration any higher than
what is recommended for the fertilizer. Excess fertilizer may well kill
off all roots. The ideal fertilizer is one with a high phosphate content
(e.g. 15-30-15), which stimulates tuber growth. In the end the health
of an Amorphophallus is measured by the increase of the size of the tuber
every season, especially in young to submature plants. The tuber may increase
its weight threefold per season.

Hier ist eine aufwändigere Methode, die wohl zu noch besserem Wachstum und starken Pflanzen führen soll, eine Abfolge von drei verschiedenen Düngern, je nach Wachstumsphase:

https://garden.org/thread/view_post/288064/

Zitat von »LariAnn - Aroidia Research«

I was working with Amorphophallus and found that with the proper fert regime used throughout the whole growing season, one could cause the
tubers to grow so large that they could distort or break their pots open.
The regime is as follows During the first 1/3 of the growing season (leaf emergence is the start), use a fert like 18-6-8, something with nitrogen highest and phosphorus lowest of the three..
During the second 1/3 of growing season (usually midsummer period), switch to something like 14-14-14 (NPK all about equal).
Finally, in the last 1/3 of growing season (late summer, early fall), switch again to a high phosphorus mix such as 14-26-6.
That is my special secret sauce for maximum tuber size in plants which go dormant for winter. Be sure that adequate levels of micro-nutrients are available all season. Not only will this augment tuber growth, but will encourage blooming and excellent new leaf health on emergence.

Am Ende wieder der P-Dünger für große Knollen.

Meine Fragen nun:

1. bekomme ich im Baumarkt/Gartencenter/Amazon einen 15-30-15 (oder ählich P-betonten) Dünger und falls ja, welchen? Bitte keine 25kg Säcke, da ich nur ein paar Pflanzen im Wohnzimmer habe. ;-)

2. hat jemand konkret Erfahrungen mit diesen Dünge-Methoden gemacht? Also entweder ausschließlich P betont düngen oder angepasst in 2-3 Phasen (am Ende P-betont) und kann dazu etwas schreiben?

Gruß,
Christian

The customized strategy would be me also something much more, especially since not all plants always at same growth stage are. But if, as recommended by IAS, you can get good growth and bigger tuberous permanent P fertilization then I would try out already that.

Today have I been looking scholar Google studies on Amorphophallus fertilization (some types such as konjac and paeoniifolius are grown in a large scale in Asia for human consumption and are therefore well understood) and couldn't find anything for the benefit of the phosphate as, a study has said explicitly, phosphates reduce the yield. N + K stressed fertilizer were used there.

But the Aroid society they will know it surely? The care instructions are an Aroideana article by Wilbert Hetterscheid, from which most of the photos in the Amorphophallus database are, so a "Pro". And potted plants in the greenhouse are maybe different than which you out grow in soil on fields.

In any case I would try likes, but you need to find once the fertilizer.

I brought a Garden Center employees fertilizer with my question after 15-30-15 to despair. On the next, a fertilizer for turf by Chrysal with NPK 12 + 18 + 10 was +(2MgO)+(1Fe). But the gardener said, the extra iron could be possibly harmful and I should once more research before buying.

After further research, lawn Starter fertilizer seem often to have the "appropriate" concentration. But there are of course only in 25kg sacks.

MANNA major lawn start lawn fertilizer with 18-30-10. The absolute values closest to the IAS recommendations on it.
Beckmann lawn fertilizer Starter 12-20-10. Almost exactly 1:2:1 ratio as in the recommendation.

Both over €50 + shipping for 25kg. For this, you can then fertilize 700-800 m² Amorphophallus meadow.

@Andreas
He plant Starter is 10-52-10! Wow.