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David K

Latest posts by David K

The Mystery of NPK

Posted: 15/03/2014 at 09:41
chicky wrote (see)

Thanks for this thread - always up for learning the science in bite size chunks !

A question - what does seaweed extract do on the NPK front?  And things like tomato feed are high in K - but do they have any of the N or P too?

Chicky - Yes there are the other two elements in tomato feed. The analysis of say Tomorite (you need to read the labels) is 4-3-8.... the figure 8 indicating the potash content.

As far as I know, seaweed contains nitrogen (N)  & trace elements, but negligible amounts of the other two.....I would need to research it to be absolutely sure.

Gardeners World 2014 BBC2

Posted: 15/03/2014 at 09:25

 Not a big deal really, but I do appreciate honesty and I would like him to be more open about who actually does the nuts & bolts gardening at Longmeadow.

The Mystery of NPK

Posted: 15/03/2014 at 08:52

"Although there are several types in there chemical form"......I wouldn't believe I penned sorry! 

Gardeners World 2014 BBC2

Posted: 14/03/2014 at 22:23

Tonight, Monty gives every reason under the sun to explain the demise of his beloved box hedging. The fact remains that it has been a disaster area ever since the program was first broadcast from Longmeadow two years ago.......The reason - he confessed to stupidly cutting it back hard in October.

That's when you invited in box blight, Mr Don!

Top Dressings

Posted: 14/03/2014 at 20:05

Gary, I would just say that business people starting threads and posting links advertising their business are often treated with some suspicion.

Camera Corner

Posted: 14/03/2014 at 19:47


Summer 2013.




The Mystery of NPK

Posted: 14/03/2014 at 19:41

As promised, I’m starting this thread to compliment Mike’s excellent ‘The mystery of pH’ thread. I’ll keep it as simple as possible, otherwise it with develop into a chemistry class.

 Basically NPK is:  N=nitrogen P=phosphorous and K=potash, the three main food elements necessary for plant life. Nitrogen is required for foliage growth, phosphorous for root growth and potash for growth of flowers and fruit.

 These elements can be applied in chemical or organic form…..the latter being preferred by most gardeners and the former mainly used by commercial growers.

 Although there are several types in there chemical form, the most common available to us gardeners being, Sulphate of Ammonia = N (nitrogen) Superphosphates = P (phosphorus) and Sulphate of Potash = K (potash)

 For an example, blood, fish & bonemeal  (a favorite amongst gardeners) offers these properties.  

 Dried blood is a slaughter house by-product and is an excellent source of quickly available organic nitrogen, when used as a top dressing or watered in. Dried blood completely soluble and can be mixed with water and used as a liquid fertilizer.

 Fish meal is a great natural fertilizer, high in phosphorous and high in organic nitrogen. Fish meal is quick acting, offering a sustained supply of nutrients.

Bone meal is used as a long-lasting source of phosphorous as well as low levels of nitrogen, potassium and calcium. The extremely slow availability of nutrients from bone meal makes it a very safe fertilizer, especially when planting of potting very young or new plants.



The mystery of pH.

Posted: 14/03/2014 at 11:01

Okay....will do that later.

The mystery of pH.

Posted: 14/03/2014 at 10:43

I wouldn't mind starting a similar thread about NPK, if there was any interest.

Growing Sweet Peas

Posted: 14/03/2014 at 09:48


 ....further to my previous post, I'm posting this pic to show how the pinching-out process has encouraged new shoots to grow from the base, thus bushier plants.

PS. Two plants in the pot and the new shoots are the paler green ones either side.

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