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In 1963, a 7-Eleven store near an Austin, Texas, university began to stay open all night for student shoppers. It was such a success that other stores in the chain adopted the 24/7 hours, and ...
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In the topsoil, we find 20% clay, 10% sand, and 70% silt; in the subsoil, 35% clay, 8% sand, and 57% silt. Organic matter concentrations in the topsoil are intermediate. The naming of the soil consists of four steps. [1] Question 1: Does the soil have diagnostic horizons, properties and materials? The soil has the following diagnostics:
In soil science, agriculture and gardening, hardpan or soil pan is a dense layer of soil, usually found below the uppermost topsoil layer. [1] There are different types of hardpan, all sharing the general characteristic of being a distinct soil layer that is largely impervious to water. Some hardpans are formed by deposits in the soil that fuse ...
It is also used to describe a topsoil horizon that contains organic matter (humus type, [4] humus form, [5] or humus profile [6]). Humus has many nutrients that improve the health of soil, nitrogen being the most important. The ratio of carbon to nitrogen of humus commonly ranges between 8:1 and 15:1 with the median being about 12:1. [7]
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