Growmore Substitute

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Hobnails

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Growmore Substitute
« on: March 09, 2010, 10:54 »
Can somebody please advise if an NPK 15;15:15 fertiliser is a suitable
substitute for Growmore if used at half the recommended Growmore quantities

TIA
Little by little a bird makes its nest!

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Salmo

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Re: Growmore Substitute
« Reply #1 on: March 09, 2010, 11:09 »
Yes.

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BostonInbred

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Re: Growmore Substitute
« Reply #2 on: March 09, 2010, 11:53 »
Growmore is 7-7-7 so it should be ok

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Hobnails

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Re: Growmore Substitute
« Reply #3 on: March 10, 2010, 11:17 »
Many thanks for your advices.

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Kristen

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Re: Growmore Substitute
« Reply #4 on: March 10, 2010, 16:57 »
In principle 15:15:15 will only need half as much applied as 7:7:7 - but is otherwise the same balance/ratio of the main components. (Might be different trace elements - but I very much doubt that matters a jot)

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blackbob

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Re: Growmore Substitute
« Reply #5 on: March 10, 2010, 17:33 »
Can somebody please advise if an NPK 15;15:15 fertiliser is a suitable
substitute for Growmore if used at half the recommended Growmore quantities

TIA

yeah in principle it's the same,but like mentioned earlier you will only need half the amount.an easy way is to mix what your applying with an equal amount of sharp sand then scatter as normal.
saves you having to worry about too little or too much.just put it on as you would Growmore.bob

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Hobnails

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Re: Growmore Substitute
« Reply #6 on: March 10, 2010, 17:49 »
Thanks again!
I'll keep the volumes the same by mixing half teh amount with sharp sand as you suggest.
There are no recommendations or instructions on the back of the sack.

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Salmo

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Re: Growmore Substitute
« Reply #7 on: March 10, 2010, 19:32 »
It is quite difficult to find recommendations for rates of fertilizer for different vegatable crops. Even in the advice area of this site advice is inconsistent and for some crops just not there in detail.

What we need is a table with grams per square metre of NPK required by each crop with notes on when to apply. - How about it John?

If you decide that you need 100g per square metre of fertilizer, weigh out 100g and spread it on a metre. That will tell you what 100g on a metre looks like and you can spread your fertilizer on the plot to look the same. Exact amounts are not critical.

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Ivah

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Re: Growmore Substitute
« Reply #8 on: March 10, 2010, 19:34 »
Get "Know and Grow Vegetables" from the library (out of print). I might try and type the table later but it is a bit tricky how it will come out.
'Nullius in verba' - 'Take nobody's word for it'

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Yorkie

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Re: Growmore Substitute
« Reply #9 on: March 10, 2010, 20:15 »
If you're typing direct from the book, you risk infringing copyright Ivah - please don't put the website at that risk.
I try to take one day at a time, but sometimes several days all attack me at once...

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blackbob

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Re: Growmore Substitute
« Reply #10 on: March 10, 2010, 20:24 »
4 handfulls to the metre has always done me ok lol.not something that needs to be exact though,just dont over do it.

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Ivah

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Re: Growmore Substitute
« Reply #11 on: March 10, 2010, 20:32 »
"Know and Grow Vegetables" assumes the quantities of NPK in fertilizers are roughly equal and if you get the N correct the others will follow, you can usefully use a little extra P for root crops. Strangely the table doesn't give an application rate for Growmore 7-7-7 but you can use double the 15.

I'll try and reproduce the table - book long out of print Yorkie, published 1979.

Can't persuade a table to come out right so here is my calculation of ozs per square yard for Growmore 7-7-7, to convert to grams per square metre multiply by 34

Peas                                                  0
Carrots, Radishes                              1
Broad Beans, Parsnips, Swedes        3
Lettuce, Onions, Calabrese,
French Beans, Turnips                       4              
Leeks, Early Potatoes                        6
Main Potatoes, Beet, Spinach,
Cauliflowers                                       8
Brussels Sprouts, Cabbage               10

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BostonInbred

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Re: Growmore Substitute
« Reply #12 on: March 10, 2010, 21:05 »

What we need is a table with grams per square metre of NPK required by each crop with notes on when to apply. - How about it John?


BUt then how do you know what the base EC of the substrate is in the first place? Without that information, and it will be different for every plot, such a table woudl at best be an approximation,  and at worst miles out. Thats why growers spend large amounts of money on lab tests to find out nutrient levels in growing medium.

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Ivah

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Re: Growmore Substitute
« Reply #13 on: March 10, 2010, 22:43 »
Analysis is never going to be viable on the allotment or in the garden. Salmo asked  "It is quite difficult to find recommendations for rates of fertilizer for different vegetable crops. Even in the advice area of this site advice is inconsistent and for some crops just not there in detail. What we need is a table with grams per square metre of NPK required by each crop" - this is what this table seeks to supply. I assume my good condition fertile ground with lots of organic matter needs a little less than this but that is for each grower to judge, at least it gives a starting point. If you want the full context I took it from :
"The amount of each nutrient required can be predicted accurately only if the amount in the soil has been measured by chemical analysis. As the gardener is unlikely to be able to get his soil analysed readily, a method of forecasting fertilizer needs without soil analysis can be used. Although it can only be approximate as it depends on a number of assumptions (in particular, that most plant waste is returned to the soil as compost) it is nevertheless a good guide".
For those who don't know, this book was written at The National Vegetable Research Station.

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Salmo

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Re: Growmore Substitute
« Reply #14 on: March 10, 2010, 23:05 »
Sounds like a useful book.

No need for it to be complicated. If you have the basic recommendations there are a few assumptions that can be made to allow you to fine tune what you apply.
e.g
- if you have put on lots of organic matter then you may need less nitrogen.
- as a rule heavy soils are low in phosphate and have plenty of potash.
- as a rule light soils are high in phosphate and low in potash and magnesium
- some crops respond to higher phospate or potash. e.g. tomatoes like high potash.



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