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Austria

I discovered that the majority of the older leaves of my 621 Pley (very big plants with lot of leaves and covering already a big area) started to turn to a ligth yellow and brown lighter green. I`ve read that this means it has possibly chlorosis, a lack of magnesium and/or iron. It is recommended with other plants than pumpkins to replace the soil around the planting area with fresh compost and/or add some special Mg/Fe fertilizer. I don`t think that it may be easy to replace the soil at the planting area, rather I will add some fertilizer or try to produce some compost tea and add it. Anyone who knows special anti-chlorosis fertilizers?

7/26/2005 4:55:53 AM

Hilpoltstein, Bavaria, Germany

Did you get good amounts of rain recently? If so, your soil might be too wet resulting in an oxygen deficiency and again resulting in yellowing leaves.

7/26/2005 5:47:17 AM

Austria

Martin, the patch was flooded yesterday evening, but the problem appeared before. Wouldn`t it be that in case of oxygen defiency all leaves would show reaction. What I have read was that is very typical for chlorosis that only the older leaves start changing colour very slowly. Your objection may be right, but I think it may more likely be chlorosis. Another argument is that only that one plant has the problem and it`s the far biggest plant which has taken over much more space than the others. It may have consumed most of the nutrients in the soil and I really try to use not too much fertilizer to burn the plants. I`m looking for something that can supply the soil with more Fe/Mg.

7/26/2005 6:40:02 AM

Cologne / Germany

To my knowledge chlorosis is more related to new growth. In that case iron fert like Fertilon or Ferramin might help.
For the older leaves, a foliar treatment with calcium and magnesium should work. Probably you can´t supply the soil now any more, you have to look for a Cal/Mag fertilizer that can be sprayed. Links:
http://www.lebosol.de/produkte/index.php
http://www.uni-muenster.de/Biologie.Didaktik/Botanik-Internet/Mineralsalz.html

7/26/2005 11:13:00 AM

Austria

Thanks a lot floh! You might be right and some links I found mention chlorosis with lack of Fe and Mg, Calcium could be another thing. What I did yesterday, I bought two different Fe fertilizers for foliar feeding additionally I added some Bittersalz to the soil for Mg. Hope it will help.

7/27/2005 3:27:31 AM

Hilpoltstein, Bavaria, Germany

Watch your Ph when using the Bittersalz!

7/27/2005 6:07:00 AM

Austria

Yes Martin, you are right and I must admit I didn`t consider that. I was lucky enough to only apply very little of it. Won`t put it in the soil any more, but instead apply foliar 5%.

7/27/2005 7:54:37 AM

Loitsche/Sachsen-Anhalt/Germany

Heino,
These symptoms are reported also at my plants.
I have potash magnesia K; mg (/30; 10) supported scarfing manuring (0.5%) as ground fertilizer and liquid Epsom salts. I also have afterwards scattered primitive rocks flour on the roots. The effect was not successful, see meseb
And search recipes because of magnesium defect look at googles.

8/12/2005 7:48:43 AM

Austria

Thanks Christian,

nothing I have tried so far has helped either. Sprayed a couple of times with iron fertilizer. I more and more get convinced martin could have been right and it probably is a kind of oxygen defiency on the roots. I`m not sure.

8/12/2005 8:15:17 AM