Julienmos wrote:I already mentioned this video a year ago
agriculture / the-garden-of-lazy-garden-more-than-bio-without-fatigue-t13846-8950.htmlprecisely speaking of compost, I do not pick up too much ...
he says that it is not a fertilizer, not in the short term ... that the compost "sequesters" its elements a little ... that it is rather a "reserve" product for the soil.
(first video to 21: 20)
but I thought that a compost, as it is already well decomposed (if it is ripe), the minerals have concentrated, and so it will have a significant fertilizing effect (you write it yourself in your book) .
Ah! I had zapped at the time.
On the question: once again, it's more complicated! And in 45 mn, he had no chance to be complete!
The compost you bring is several things:
a) more or less decomposed organic matter, emptied of most of its energy; that one, seeing that it is emptied of its energy, is "slow"; as there are essentially woody elements remaining (therefore poor in nitrogen), the continued decomposition in the soil will sequester a little nitrogen [he does not say this, but I add: but as it is slow, and that after everything, the tonnage is low, it goes unnoticed; nothing to do with the effect of a massive supply of straw or sawdust!]
b) but this same organic matter is ALSO a kind of "sponge" which has absorbed the mineral elements resulting from the already completed decomposition of "fast" materials, celluloses etc of "green materials", mainly by bacteria ... Finally, what has not been washed away!
So ripe compost has a fairly rapid effect as an organic fertilizer (less than mineral fertilizers which dissolve very quickly), due to the elements resulting from the mineralization of the green part. Once this sponge sucked, it will be a "slower" of cycles (compared to fresh organic matter or hay) and a "pump" of elements ...
Well watch the video considering that the guy focuses on soil organic matter and its effects on biological life. He only talks about that. It does not speak of solution of the soil, in which very quickly will be the mineral fraction brought.