The Soil Pit

Everyone got to see a soil pit today. It was nice to see everyone interacting while we determined aspects of the soil profile. We determined the horizons, depth of horizons, structure, texture, color, percent coarse fragments, pH, boundary, and special features. The pit we examined had eight horizons, and the pit was one hundred and forty-one centimeters deep. The horizons were buried by a top A horizon that had eroded from above the pit. There were several horizons that were called a E horizon, and they are a horizon that has been leached of all nutrients by water moving down the profile, like rain or snow melt. Most of the textures were sandy loam while the last two horizons were clay and sandy clay loam. The pit was neutral at bottom of pit and as you reach the top it became more acidic. The boundaries were mostly wavy and at fifty-eight centimeters to ninety-six centimeters the boundary was irregular. This irregular boundary made it hard for everyone to figure out if it was one or two horizons. For special features there were roots in most of the profile. When you reached an E horizon the roots either stopped or went straight through the horizon. The reason they didn’t spread out in the horizon because there were fewer nutrients. Also, the pH was very acidic causing the aluminum to be very mobile, which aluminum is toxic to plants. The last special feature we saw was a lamellae. A lamellae is an illuvial horizon that is a small strip of accumulated clay. The lamellae was seen between ninety-six and one hundred and seven centimeters. This pit was very interesting to look at because I have never seen one like it. Also, it was very challenging for us students that are studying soil.soil pit

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