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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.
Average yields of grain crops in England from 1250 to 1450 were 7 to 15 bushels per acre (470 to 1000 kg per ha). [54] Poor years, however, might see yields drop to less than 4 bushels per acre. [47] Yields in the 21st century, by contrast, can range upwards to 60 bushels per acre. [55]
The Universal Soil Loss Equation (USLE) is a widely used mathematical model that describes soil erosion processes. [1]Erosion models play critical roles in soil and water resource conservation and nonpoint source pollution assessments, including: sediment load assessment and inventory, conservation planning and design for sediment control, and for the advancement of scientific understanding.
The world average declined by 18 percent to 0.20 ha per capitain 2021; the decrease was the largest in Africa (−25 percent, to0.21 ha per capita), followed by the Americas and Asia (−17 percent each,to 0.37 ha per capita and 0.13 ha per capita, respectively), Europe and Oceania (−7 percent each, to 0.39 haper capita and 0.77 ha per capita ...
The core of the refuge is a preserved 5,000-acre (20 km 2) tallgrass prairie remnant, and an additional 30,000 acres (121 km 2) are either in the process of restoration or will be soon. According to The Nature Conservancy , so far, 100 wetlands have been restored and 8,000 acres (32 km 2 ) of land have been seeded with native plant species.
The US is the world's largest producer of corn. [8] According to the United States Department of Agriculture (USDA), the average U.S. yield for corn was 177 bushels per acre, up 3.3 percent over 2020 and a record high, with 16 states posting state records in output, and Iowa reporting a record of 205 bushels of corn per acre.
Soil loss tolerance. Soil loss tolerance for a specific soil, also known as the T value, which can be calculated with [1] formula, is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely. T values range from 1 to 5 tons per acre per ...
Agriculture in Poland has always been an important part of the country's economy. Out of the 18.727 million hectares (46.28 million acres) of agricultural land (about 60 percent of Poland's total area), 14.413 million hectares (35.62 million acres) were used for crop cultivation, 265 thousand hectares (650 thousand acres) for orchards, and ...
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