Pelo jeito onde tem essa terra preta de índio é onde era o lixão das aldeias, como tudo que eles usavam era biodegradável a decomposição desses lixos resultou nessa terra preta.
Muchas gracias por el video. Una muy buena expicación de la Terra Preta. Quizás debamos agregar: espera luego de hacer todo eso. Maybe 2000 años y tendrás la que ellos dejaron para nosotros. Thank you very much for the video. A very good explanation of Terra Preta. Maybe we should add: wait after doing all that. Maybe 2000 years and you will have the one they left for us. Muito obrigado pelo vídeo. Uma explicação muito boa sobre Terra Preta. Talvez devêssemos acrescentar: espere depois de fazer tudo isso. Talvez 2.000 anos e você terá aquele que eles deixaram para nós. Merci beaucoup pour la vidéo. Une très bonne explication de Terra Preta. Peut-être devrions-nous ajouter : attendez après avoir fait tout ça. Peut-être 2000 ans et vous aurez celui qu’ils nous ont laissé.
Como resultou o experimento do cultivo da batata en vertical? Os seus videos son moito interesantes e informativos. Eu aprendo moito con eles. Nao sei porque nao tenhen mais visitas. Saude e boa terra.
Oh…I recall a question I had regarding swales, if someone would be so kind as to advise me.. Will the land beneath a swale get washed away in a few years? Is there some sort of preventative measures to take, or not necessary… like, if there was a house at the top, would the weight of it combine with the water from the swales and wash away the slope from inside
Good afternoon. A swale could be considered a mean for an objective: rehydration of the soil. Then, we must consider the context. If a slope is sharp, it may exist a risk of landslide. In this case, it will be necessary to plant perennials with deep roots to fix the soil below the swale, taking advantage of the water infiltration to nurture and accelerate the vegetation growth. In a second step, the vegetation will act as an armature to prevent erosion. In case of extreme slope and climate, extreme solutions need to be considered: deeper root system. If too extreme ; assume the risk and create secured zones as no man's areas below the slope (rare situation)
Thank you ! What seemed daunting is now very clear to me …this was an excellent presentation. Sharing your skill and knowledge is wonderful. I’ve learned everything I needed to know for my plans and I can now look at my property with new eyes.
Hi, although I have seen this video 6 years after it was made, it has helped me so much to finally understand the difference between the different concepts. I couldn’t get it when I read about it, but watching you do it with earth/clay has been ideal. Thanks so much
a "key" point is called an inflection point in math: when a concave slope/function switches to a convex slope/function. the change in the slope at an inflection point is 0: it is no longer become steeper and not yet becoming flatter.
Seems to me term 'keyline' in this video is just some irrigation line. Keyline is simply a contour line that goes through the keypoint, i.e. a very specific contour line. Swales are trenches plus berms and can be located on any contour line, including the keyline.
Hello, the keyline doesn't exactly follow the contour but shows a slight slope as a way to drive the flow of water in the direction of the mount which lack humidity.
Muito legal a forma que pensaram a estrutura para impermeabilização… Uma dúvida que tenho é, como fazemos se preciso interromper a fiada para uma colocar uma porta, por exemplo, corto o saco e faço um nó no final? E para não perder o que sobrou, faço outro nó, encho com terra e no fim outro nó? Difícil achar vídeos com esses detalhes
Bom dia Jhenifer. Sim , é a solução. Só que você pode evitar de fazer un nó que necessita utilizar bastante saco. É suficiente deixar 10cm de saco libre e bloquear esse final do saco embaixo da linguiça (retornando o tecido por volta, embaixo da linguiça). O peso do barro vai fechar a linguiça e a nova linguiça quando compactada vai finalizar o bloqueio.
Thank you SO much! This video completely cleared up the whole subject. I understood swales, but this made the keypoint and keylines equally understood. Your water and soil demonstration worked better for me than drawings. I subscribed to your channel, and I'm interested in watching whatever you make. Thank you again.
Thanks much for the insightful demonstation.Made me think there might be something to adding berms in areas with high solar aspect on the up slope or higher on the downslope
You keep repeating the water takes the shortest way down, but that is really misleading and not true. Water takes the way of the least resistance, or basically always where the angle down is bigger. But that is not always the shortest way. In fact this can be easily seen in practice with rivers, which are never the shortest path between the river source and the sea/ocean.
This rule of the shortest way is a simplification to describe the system in the limit conditions. To help understand the dynamics in the case of keylines. The issue with the water flow is the variation on water debit. Passing a current threshold the water goes over the canals borders (canceling the resistance of the edge). The result is a distribution of water between the canal contained by the borders and the overflow passing over the edges. The design of the keylines intend to find a balance between these two behaviour with a median able to distribute the water with a maximum coverage.
@@stephanealegoria7016 it's a simplification that is false and it actually makes it more difficult for people to understand the concept as applied in two life, where terrain features are more complex.
I had a lot of confusion with this too; this video helped quite a bit. Here's my two cents. Keyline/Keypoint - place where the valley (between ridges) changes from sharp slope to shallow slope (contour lines are farther apart). Keyline plow/keylines - subsoil ripping with a Keyline plow is started from just above Keypoint, down below contour on ridges (as video says, they 'hang' towards ridges). They are *off*-contour. Swale - trench with a berm on which is a food forest. They are level, *on*-contour. Similarities: both slow, spread and sink water. Keylines allegedly handles similar quantities of water (but more evenly spaced through subsoil of land). It should also reduce runoff in the same way (but I wonder about flooding situations: swales with good overflows should handle it better). Differences: Keylines are supposed to be a cheaper, less risky (eg. landslides from water), less permanent (which is good regarding Scales of Permanence - a Keylines system's concept), and more mechanization oriented (spacings should be very predictable). An emphasis is made of increasing decay of dead plant material due to presence of subsoiled air, water and biomass for increasing soil fertility. Some think keylines are for grazing, swales for trees (I've seen in places). Book says otherwise (Yeomans clearly mentions growing crops *and* pasture for grazing). This can also include orchards and pasture. Upon the whole, I think the only advantage I've seen for swales is that they might handle flooding better, and growing a food forest (bit more chaotic, diverse and less precisely spaced than orchards). Mark Shepard allegedly combines both systems (but I haven't found a really good video on that). Yeomans' system itself has dams and 'water channels' between them (swales? but no food forests are mentioned).
Just a comment about key point. This definition you put here has no mathematical resolution. It's impossible to define the point when the curve change in relative mesure. They are an infinity of points in the definition here above. However the inflection point between concave and convex has a unique point. The key point must be exact in order to position further the water catchment a bit below. However I do not want to be dogmatic , essentially the hard job in water management is finding the right water flow , the most efficient in average between the volume of water , the season (rain) , the culture, the vegetation and it's evolution, etc.
Thanks Branimir for this addition, very useful. What is key in earth shaping is hybridation with plants. Keylines, swales will be temporary solution. In the end what matters is adding vegetation to the architecture. For keyline it can be small herbaceous plants with deep roots. For swale it can be fruit trees , trees adapted to pruning , cespitose bambu in large properties , for ground cover or structure material production, etc. The destiny of any water catchment, lakes ,ponds is being filled by earth from erosion, just a question of time. The idea is a process which start with earth-shaping and later on gives the baby to nature. She knows best how to fight against erosion and make the soil drink water for soil biology and rizosfere.
Seems to me 'keyline' in this video is just some irrigation line. Keyline is simply a contour line that goes through the keypoint, i.e. a very specific contour line. Swales are trenches with berms that can be located on any contour line, including the keyline.
