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I'm curious to know how you use 15-5-15 Ca Mg fertilizer. I've also bought this fertilizer and found that when I make a solution with rainwater containing 65 mgr/L nitrogen, the pH drops to 4.5. It's a very acidic fertilizer and unusable with pure rainwater. The only solution is to add tap...

Yes I control the pH of the fertiliser solution. I ajust these using tap water ( usualy 40 to 50 ml for 1 liter) mixed with rain water. In such conditions at 65 ppm of total nitrogen using 21-7-21 fertlyser pH solution is around 6.2 an a conductivity of 450 500 µS. We have a very hard tap water...

Personally, I don't deny the fact that most terrestrial plants assimilate nitrate ion very quickly. As I've already mentioned, during a visit to a major grower in Holland, I found pallets of 20-20-20 in his store and a few 25 kg bags of calcium nitrate. For the past two years, I've been...

Maybe it's because the aeration and loosening of the substrate?

Yes

@Lance: not surface stains. Mee to I know this problem. Its bacterial. I treat it with Physan. It seems to me that this plant should be repotted.

Beautiful flowering !

What is the plant with red flower left side on your pictures ?

Superbe !

Beautiful !

Beautiful. Usualy it is flowering in May?

When you say that slow growth isn't true for everyone, does that mean it's true for most? Could you elaborate on what you mean by a question of fertilization? What kind of fertilizer (with or without urea), concentration and frequency would you recommend?

It's a fact that paphiopedilum grow very slowly! I often wonder if it's really possible to grow the amount of roots I regularly see in the photos on this forum using only mineral fertilizer. I've been growing paphios for about fifteen years now and I've noticed that when I change the substrate...

I adjust the pH to values between 6.2 and 6.4 for two reasons: To combat the tendency of the substrate to acidify due to degradation To ensure that plant roots are in an environment in which they are able to assimilate trace elements. Ref...

It's a well-known fact that nitrate nitrogen causes yellowing of the foliage. I've already discussed this with the manufacturer of AK..NE Rain Mix. To reduce this tendency, the manufacturer adds sulfur in the form of Potassium sulfate. When a solution containing 50 ppm nitrogen is prepared with...

I have compared the oligo content of several fertilizers that can be used to grow orchids and I have never found another fertilizer as rich as MSU in the elements I mentioned in my first message. Only iron is chelated... am I to understand that Cu, Zn and Mn are not?

@Ray and Roth We've been talking about MSU fertilizer and one question has always puzzled me.... When I compare the trace element content of fertilizers that have been used for decades to grow orchids, I find that MSU fertilizer has a higher content. If I compare the trace element content of...

The question of Malipoense is: What I need to do !!!! I've had this problem before. I cut the leaf a few mm below the black part (with a hot disinfected blade) and immediately put some cinnamon powder on the freshly cut part. I'll be watching to see if it continues to develop. If so, .... cut...

A tsp = ~ 4gr ( P..ers 20-20-20 measured and weighed) 3/4tsp --- 3gr /3.75L ---> 0.8 gr/L at 20% N ---> 160 ppm N /2W ---> 80 ppmN /1week You are right Ray.

Beautiful !