Spatial Variability of Soil pH Values in an Organic Amendment Experiment on the Prairie View A&M University Farm, Southeast Texas
Abstract: Soil pH (Reaction) is defined as the measurement of Hydrogen (acidity) and Hydroxyl (basicity or alkalinity) ions in a soil solution. The ions that exist in the soil water either are produced from decomposition of organic matter, which produces organic acids, or from solutes that leach from rocks and minerals that decompose by chemical and mechanical processes. The soil samples were collected from an Organic Amendment Experiment on the Prairie View A&M University (PVAMU) Farm. The objectives of this research project were to measure the soil pH and to determine the spatial variability of the recorded values. The Organic Amendment Experiment included four treatments with three replicates (levels) including: 1) Control; 2) Chicken Manure; 3) Dairy Cow Manure; and 4) Milogranite. Preliminary results indicated that the mean pH values ranged from 5.24 (Milogranite, Level 3) to 7.21 (Dairy Cow Manure, Level 3). Spatial variability data indicated that the pH values from the surface (0-15 cm) and the subsurface (16-30 cm) ranged from strongly acid to neutral during the monitoring period. This observation corresponded with the addition of mildly alkaline amendments to these naturally acidic soils that tend to become more acidic with time, unless lime and calcium bearing compounds are added to the soil system.
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