A BTU, short for British thermal unit, is a basic measure of thermal (heat) energy. One BTU is the amount of energy needed to raise the temperature of 1 pound (0.45 kg) of water by 1Â° Fahrenheit (0.55Â° Celsius).e: dougsherman's post. 1 BTU is roughly 1055 joules of heat, or energy. You are mistaking joules with joules/second. Regardless of how long it takes to expose the water to 1 BTU of heat, 1 BTU of heat will raise the temperature of 1 pound of water 1 degree Fahrenheit.
Silt, being moderate in size, has a smooth or floury texture. The combined portions of sand, silt, and clay in a soil determine its textural classification. Sand particles range in size from 0.05â2.0 mm, silt ranges from 0.002â0.05 mm, and the clay fraction is made up of particles less than 0.002 mm in diameter.
Fine-textured soils may test low in sulfate-sulfur; however, applying sulfur may not result in increased crop yields. Also, the organic matter content of the soil and the sulfur content of irrigation water must be known.