Hello, thank you for the kind words and for leaving feedback for my designs.
The diamonds are supposed to represent soil layers, or different soil. The gradation of the brown colors is meant to show layers of soil down to the most deeper. I am not a soil expert, as you are, but I am trying to portray the idea. The green, as you probably already figured out for yourself, is for the grass.
Entry #12 is also meant to express drilling, or going deeper, as the second and third diamond are more like arrows pointing down.
I will add color to the text and will spice-up the letters.
I like the concept of the diamonds and starting from the grass and going deeper, that makes sense. i also like entry #20 because its unique, but do you know if any other company has a similar logo, i feel like I've seen it before. Entry #13 and #20 are really nice. Can you incorporate some green into entry #5.
Hello. Thank you for the input. I would never create a logo, if I had seen it before - this would not be creation, it would be simply copying. But it is possible, that there is a company out there, which has similar logo - after all there are thousands if not millions of logos. But I can say for myself, that I would never copy another company's logo - it is against my beliefs and the regulations of Logo Tournament.
I will develop the logos you like further. Thank you for the feedback.