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Organic growers are often telling you to "feed your soil; not your plants".
The reason for this is that once you have created a healthy, living soil, your plants are going to thrive. It's the micro-organisms in the soil, and their complex relationships with each other and your plants that make nutrients available for growth.
Your crops will only ever be as nutritious as the soil they are grown in, so it’s worth spending the time (and a little bit of money) to get the healthiest produce on your table.
Traditionally at the start of each new growing season, gardeners top up the soil to ensure that the new crop will get the best start. For new gardeners, the choice can be overwhelming, and it's hard to choose what you THINK your soil might need.
Here are some of the common soil improvers organic gardeners use, with some pro’s and con’s of each:-
Aged manures of herbivores will greatly increase the amount of organic matter in the soil. This encourages earthworms and microbes, which help with soil structure and nutrient availability. These manures contain some nitrogen but are not overly ‘rich’. Manures from paddock animals will always contain seeds, so be aware of potential weeds. It is best to compost manures before use; to help ‘cook’ seeds, and to minimise fly problems.
Depending on the diet of the pig, the nutrient and organic matter content of pig manure falls somewhere between herbivore and poultry manure. As always, use well composted.
Compost can be used as a soil improver, and is great for adding organic matter to the soil. Whether you make it yourself or buy a commercial product, it is one of the best ways to improve soil structure.
Compost is a fantastic way to recycle garden green waste, weeds, lawn clippings and food scraps, and prevent them going to landfill. However, nutrient content of compost varies wildly; depending on the source of ingredients. Even if you make your own from garden waste, if it’s produced from plants grown in depleted soil there are few nutrients to recycle, and you won’t end up with a wonderfully rich batch without using additives.
For further reading on our Manure and Compost products, click here.
Imaginatively, rock dust is made from rocks, crushed to a dust! Its main benefit is that it provides minerals in a very stable, slow release form. However – again the mineral content varies hugely with the source of the rocks. Volcanic rock dust tends to be of a high quality; containing a wide range of mineral elements that originated deep within the earth, brought to the surface by lava. Or, find a blended product. It may be more expensive but it is the best way to ensure there is a wide range of minerals included. Usually a small application to your gardens once a year is all that’s required, or add a small handful to each batch of compost you produce.
A great tonic for your garden. It usually provides a good source of nitrogen and phosphate, but little potassium. A fish hydrolysate (which still has the oil in it) is even more beneficial as an excellent source of food for soil fungi.If you like using liquid feeds, if possible, alternate between using a fish and a seaweed solution on your garden. Different formulations will provide a range of different nutrients to the soil and this tends to promote a wider polyculture of beneficial microbes.
A great source of nitrogen and some phosphorous, but little potassium. (Add about one part of sulphate of potash to 4 parts of blood and bone for a good, general purpose organic fertiliser for all plants.) Do use a good quality blood and bone; cheaper products can contain fillers like sawdust that do little but bulk up the product. At the Green Life Soil Co, we use pure blood & bone, with blood meal and added rock dust to provide a wide range of nutrients in our quality blend.
If you are lucky enough to have access to a worm farm, castings are brilliant to use in your garden. Castings are packed with beneficial microbes and concentrated trace elements. They have the ability to retain moisture in the soil. Always use worm castings dug into the soil, not left to dry out on top. To buy in, worm castings are expensive; so it’s a great incentive to have your own worm farm. Use a small handful when you plant out seedlings to help get them off to a flying start.
For further reading on our Minerals and Fertiliser products, click here.
If you have added a range of nutrients to your garden and are still concerned about the health and vigour of your plants, it is worth conducting a pH test on the soil. If your soil is either too acidic or too alkaline nutrients in the soil will be unavailable to plants, so you will need to add specific amendments to fix the problem. The good news is that adding organic material (providing it is pH neutral) will help overcome pH problems. A good garden centre will be able to offer you advice and most will do a free pH test if you take in a small sample of soil. See our fact sheet on soil pH for more information.
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