I know that I occasionally bang on about sustainability and the importance of organics and renewables etc. well I've just been reading that in order to produce (not enough) nitrogen in our artificial fertilisers at least 1% of ALL energy produced in the world is consumed in the process.
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Also, that, of the unbelievably huge amount if the stuff spread on the fields/into hydroponic systems and so on...wait for it...only 15% is consumed by humans or animals....
The rest runs off into watercourses causing overblown weed and algae growth and eventually into the sea where algael blooms destroy the natural ecosystems.
So, that's 85% of all nitrogen, nitrates, nitrites are being pumped into our waterways and the sea.
Many people start wringing their hands and whigeingly exclaiming that we can't feed over 7 billion people without chemical fertilisers.
This an untruth that the chemical giants want you to believe. It is entirely possible, through careful land management, the use of recycled compost etc. In my little corner of the world I have a small, 12 plant bed of Bocking 14 Comfrey ( the non-seeding variety that doesn't seed all over your garden). These plants produce more than enough liquid feed for ALL of my crops.
COMFREY LIQUID has a higher NPK ratio than tomorite, growmore etc, it is natural, easy to produce, stores virtually for ever, does not use 1 ounce of the world's energy to make. The plants themselves require very little maintenance and can produce for 30 years plus. The leaves are full of vitamins, minerals and proteins and have been shown to benefit livestock. I won't go on about the virtues of comfrey as there are articles the Chat-Shed archives if you want to refresh your reading.
Just be aware, that's all, before reaching for that bottle or bag of growmore. Also, if anybody wants some genuine Bocking 14 roots I am more than happy to send you some for free; just refund me the postage. You can buy them on line but I won't charge anything but the postage.