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Seed Compost: John Innes Mix with Oven-Sterilised Loam
The John Innes seed compost, worked out in the 1930s: 2 parts sterilised loam, 1 part peat and 1 part coarse sand by volume, with a little superphosphate and ground chalk. The RHS shows how to sterilise garden soil at home: 10 minutes at 71–79 °C in the oven, which clears out most of the soil organisms that harm or compete with seedlings.
The picture: potting compost in a pot (Wikimedia Commons, CC BY-SA 2.0).
初学者
A few hours
说明
1
1
Sieve the soil moist
Sieve the soil moist
Take good garden soil, or loam from rotted, stacked turf. Sieve it while moist through a 5 mm sieve.
此步骤所需材料：
园土6 l所需工具：
粗筛2
2
Sterilise in the oven
Sterilise in the oven
Spread it in a baking tray no more than 8 cm deep. Heat it for 10 minutes at 71–79 °C, checked with a thermometer in the soil. Let it cool.
所需工具：
烤盘
烤箱
温度计3
3
Measure by volume
Measure by volume
Measure loosely, by volume: 2 parts sterilised loam, 1 part peat, 1 part coarse sand. About 9 litres fills a bucket.
此步骤所需材料：
泥炭藓泥炭2.25 l
粗砂（建筑/陶艺）2.25 l所需工具：
量杯壶
水桶4
4
Add the fertiliser
Add the fertiliser
To each 9-litre bucketful add 10 g superphosphate and 5 g ground chalk. Mix thoroughly.
此步骤所需材料：
过磷酸钙10 克
碳酸钙（白垩粉）5 克所需工具：
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