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2. Topsoil - Wikipedia

   en.wikipedia.org/wiki/Topsoil

   The United States loses almost 3 tons of topsoil per acre per year. [16] 1 inch (2.5 cm) of topsoil can take between 500 [17] and 1,000 years [18] to form naturally, making the rate of topsoil erosion a serious ecological concern. Based on 2014 trends, the world has about 60 years of topsoil left.

3. Soil fertility - Wikipedia

   en.wikipedia.org/wiki/Soil_fertility

   Topsoil or horizon O is with sufficient soil organic matter for healthy soil structure and soil moisture retention; Soil pH in the range 5.5 to 7.0 (suitable for most plants but some prefer or tolerate more acid or alkaline conditions); Adequate concentrations of essential plant nutrients in plant-available forms;

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   To help you maximize savings, GOBankingRates asked a variety of experts to list items you should snatch up at Walmart — and items you should steer clear of. 25 Best and Worst Deals at Walmart ...

5. Humus - Wikipedia

   en.wikipedia.org/wiki/Humus

   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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7. Soil test - Wikipedia

   en.wikipedia.org/wiki/Soil_test

   In precision agriculture, soil samples may be geolocated using GPS technology in order to estimate the geospatial distribution of nutrients in the sampled area.The geolocated samples are collected using a distribution and resolution that allows for the estimation of the geospatial variability of the soil area where the crop will be grown.