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.
General recommendations for added nutrients are as follows: 20 to 40 lb/ac (22 - 45 kg/ha) nitrogen, depending on whether the crop is planted on summer fallow, pulse stubble or cereal stubble. Normal rates for phosphate range from 27 to 40 lb/ac (30 - 45 kg/ha). Potash is generally recommended if the crop is grown on sandy loam soils. The suggested rate for potash in these cases would be 31 to 62 lb/ac (35 - 70 kg/ha). When sulphur is required, apply 13 lb/ac (15 kg/ha).