There can be a small plus with legumes. But you know that.
Fallow cropping under another name?
Yes, of course, legumes. Natures little wonder. Just too bad that in a cropping system, a legumes phase to build nitrogen will halve production due simply to the time it takes.
Hey Adam,
my vege garden mate,....
I didn't mean it to be a green garden, as I'm anti-green, but when I think about it, it's as green as they come.
The straw is lucerne, and comes from out of the guinea pig winter enclosure and is full of guinea pig nuggets. It was fertilized with dynamic lifter, which is organic, and comprises mainly composted manure, but also blood and bone, see weed and fish meal. The weeds are cut with a hoe and left where they are, so is that green manureing?
There are some ducks and a pond in an enclosure behind.
It's a green garden by accident.
Pretty green garden hu?
Of course, the dynamic lifter, being mainly manure, the nutrients originally came from a grain growers paddock, via grain being fed to animals, that was fertilized by chemical fertilizer.
The dynamic lifter is 3% nitrogen. Not bad, better than straight manure though which has very little.
If I had to use straight manure on the sorghum country I just planted, at say 1% nitrogen, I would need 10 tonnes per hectare, as the sorghum will remove 100 kilos of nitrogen per hectare in the grain if it goes 6 tonne per hectare.
10 tonnes/hectare cattle manure times .01 N equals 100 kg N.
or, I could use urea, at 46% N, made from natural gas,...
220 kg/hectare urea times .46, equals 100 kg N.
So, to provide the nitrogen requirements for the crop I just planted, I could use 10 tonnes per hectare of cattle manure, or 220 kilos of urea. If I used poultry manure instead, which has twice as much N as cattle, I would be back to 5 tonnes per hectare of chook manure.
I've just about planted 800 hectares of sorghum. I could have used 8000 tonnes of cattle manure, or 4000 tonnes of chook manure, or less than 200 tonnes of urea.
You blokes in the city, chucking on some organic fertilizer to a garden, it all appears so easy, but you are really puting on incredible amounts if you convert it to tonnes per hectare
Can you see things from a farmers view now? There is not enough manure in Australia to grow hardly anything.
Every tonne of sorghum grain I remove from my paddock, the nutrients have to be replaced. So every tonne of grain,
16 kilos of nitrogen,
1.3 kilos of phosphorus,
3 kilos of potasium,
1.1 kilos of sulphur,
traces of zinc and other stuff.
leaves my paddock.
But, to grow the crop needs a lot more, the rest of the nutrients are left behind though as stubble, that turns into mulch, and I get those nutrients back. But lets not make things too complicated, forget that last bit.
If you have a think about these things, and the nutrients involved, and the nutrients that grain growers provide to the organic industry, you will soon realise that organic agriculture is NOT as sustainable as conventional, and never can be. A lot of organic farms are mining the soil. I'm not, as I know how much fertilizer I'm puting on, I know how much nutrients are leaving, and I know my soil is healthy, and covered in mulch, protected from erosion and I can keep growing food like this forever, or until fossil fuels run out anyway.
When fossil fuel runs out, that will be someone elses problem. There is enough to see me out.
Is it clear now why organic can't solve the problem?
Raining here today. Slept in till 7.30 am. Thats a nice thing about my job I suppose, but I want hot weather now and no rain for a month so I can get on with things.
See ya's.