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Compost Formulations
Silvaperl perlite can be used to prepare a wide variety of growing media, both soil-less and loam-based. Trials work has proven that composts based on perlite and peat promote better root growth than other mixtures.
Below are serveral formulations which can act as a starting point from which growers can develop mixes to suit their own plants and growing conditions.
Sowing & Rooting CompostA basic mix for a wide variety of plants
Note: Cover seeds with a thin top layer of fine peat.
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| Perlite
Peat
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50%
50%
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Rooting CompostFor propagating delicate cuttings e.g. carnations, fushias, geraniums, etc.
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Perlite
Peat
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75%
25%
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Seedling CompostFor bedding and tomato seedlings, etc.
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| Perlite
Peat
Ground Limestone
Super Phosphate (0-20-0)
Potassium Nitrate
Fritted Trace Elements
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382 litres
382 litres
2.27 kg
0.91 kg
0.68 kg
57 g
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0.5 cu. yd.
0.5 cu.yd.
5 lbs
2 lbs
1.5 lbs
2 oz
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Potting CompostGeneral purpose formula using compound fertiliser.
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| Perlite
Peat
Ground Limestone
Compound Fertiliser with trace elements
(e.g. John Innes base or equivalent of proprietry nutrient mixes such as Vitax Q-4, Chempak, Phostorgen, etc - see manufacturer's instructions)
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191 litres
573 litres
3.4 kg
5 kg
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0.25 cu. yd.
0.75 cu. yd.
7.5 lbs
11 lbs
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Potting CompostGeneral purpose formula using straight fertilsers
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Perlite
Peat
Ammonium Nitrate
Super Phosphate
Potassium Nitrate
Ground Limestone
Dolomitic Limestone
Frittted Trace Elements
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191 litres
573 litres
283 g
0.91 kg
0.28 kg
1.81 kg
1.81 kg
0.28 kg
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0.25 cu. yd.
0.75 cu. yd.
10 ozs.
2 lbs.
10 ozs.
4 lbs.
4 lbs.
10 ozs.
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Container CompostFor trees, shrubs and climbers, etc in tubs, hanging baskets, etc
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Perlite
Peat
Sterilised Soil
Ground Limestone
Fertiliser
(as per either Potting Compost above)
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153 litres
306 litres
306 litres
1.81 kg
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0.2 cu. yd.
0.4 cu. yd
0.4 cu. yd
4 lbs
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Container CompostA simple mix, if sterlised soil is not readily available.
The mix is approximately equivalent in nutrient content to a John Innes No. 2 and in formulation to a 2:1:2 loam:peat:perlite mix.
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Perlite
John Innes No. 3
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0.2 cu. yd.
0.8 cu. yd.
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