@Stefano Creatini what is the top of one swale but the bottom of another. 😆 I've seen where the fruit tree is planted the top of a swale and then watered until it is big enough for the root ball to get into the "reservoir" that is created from the moisture wicking to the mid soil from the irrigation. I was told it helps prevent water rot on the trunk of the tree. Do you see things like mold, fungus nats, or mushroom rot becoming an issue from planting to close to the irrigation channels. Alot of the citrus orchards where I am currently and grew up in southern California coat the bottoms of the citrus trees in an oil/wax substance that repels the water they spray from irrigatio. sprinklers drierctly under the trees close to their base. It is also supposed to prevent boring larve of the dreaded citrus bugs but also prevents rot.

Truly the best form of irrigation! I've used this method on large farms but also small scale. Once on a mostly tomato garden it was a flat space so I dug sloping trenches down both side of hills I built up with the clay soil removed and broken down organic matter. And at the top of the slope I dug a hole and put I small kiddie pool in. I filled the pool and channels with degrading quartz that easily turned to powder when crushed and shale I sourced from an old mining dump site I used to visit and would sometimes find amythest and citrine, for the silca and mineral content. So every time water filled the pool and washed down the channels it was feeding the plants minerals. The rocks are also good for attracting insects and the when you water it's like an insect frass tea. I covered everything in broken down hay to help wick water up the dirt hills and to distribute moisture evenly. Occasionally I would put compost tea feeds in the water where it could distribute from the bottom up. I watered the top of the hills when necessary in the beginning until the roots had grown deep enough that they reached the most rich soil that developed. And then only needed water about once a month even in the intense heat where it is in the hundreds for several days in a row. It grew hundreds and hundreds of very tasty tomatoes and the plants even overwintered and grew more tomatoes the next year.

@Rebecca Noel I'm assuming it's the three-part holistic homesteading course under the classroom tab but not 100% sure on that