The British pint is about 20% larger than the American pint since the two systems are not compatible. Almost all other countries have standardized on the metric system, so the size of what may be called a pint varies depending on local custom.
It is usually measured by the depth (in mm) of the water layer that can enter the soil in one hour. An infiltration rate of 15 mm/hour means that a water layer of 15 mm on the soil surface, will take one hour to infiltrate. In dry soil, water infiltrates rapidly.
Soil broadcast 1.0 pound of boron per acre for soils testing 0.26 to 0.50 ppm (medium). Soil broadcast 2.0 pounds boron per acre for soils testing 0 to 0.25 ppm B (low). The largest cotton yield response to boron fertilization occurs when a field has been limed to soil pH values above 6.0. Apply boron to cotton fields with soil test levels less than 0.50 parts B per million (ppm). 2  Soil broadcast 1.0 pound of boron per acre for soils testing 0.26 to 0.50 ppm (medium). 3  Soil broadcast 2.0 pounds boron per acre for soils testing 0 to 0.25 ppm B (low).