Soil fertility

（重定向自Good farmland）

Soil scientists use the capital letters O, A, B, C, and E to identify the master horizons, and lowercase letters for distinctions of these horizons. Most soils have three major horizons—the surface horizon (A), the subsoil (B), and the substratum (C). Some soils have an organic horizon (O) on the surface, but this horizon can also be buried. The master horizon, E, is used for subsurface horizons that have a significant loss of minerals (eluviation). Hard bedrock, which is not soil, uses the letter R.

Global distribution of soil types of the USDA soil taxonomy system. Mollisols, shown here in dark green, are a good (though not the only) indicator of high soil fertility. They coincide to a large extent with the world's major grain producing areas like the North American Prairie States, the Pampa and Gran Chaco of South America and the Ukraine-to-Central Asia Black Earth belt.

Soil fertility refers to the ability of a soil to sustain plant growth, i.e. to provide plant habitat and result in lasting constant yields of high quality.
A fertile soil has the following properties:

In lands used for agriculture and other human activities, soil fertility typically arises from the use of soil conservation practices.

单词	Good farmland
释义	Good farmland 原声例句 VOA Special 2021年12月合集 Good farmland is not equally spread around the world. 全球良田分布不均。 2005 English Cafe Like other states in the Midwest, Minnesota has good " farmland" – places where you can grow plants. 与中西部的其他州一样，明尼苏达州拥有良好的“农田” ——可以种植植物的地方。 VOA Special 2021年12月合集 Studies show that the best farmland, which is across parts of North America and Europe, was covered by ice during the last ice age. 研究表明，如今北美和欧洲部分地区最好的农田在上一个冰河时代是被冰覆盖的。英语百科 Soil fertility （重定向自Good farmland） Soil fertility refers to the ability of a soil to sustain plant growth, i.e. to provide plant habitat and result in lasting constant yields of high quality. A fertile soil has the following properties: In lands used for agriculture and other human activities, soil fertility typically arises from the use of soil conservation practices.
随便看	ESD type boiler的意思 ESDU的意思 esdud的意思 ESD wrist strap的意思 E.S.E.的意思 ESE的意思 E.S.E的意思 ESEA的意思 Eseallonia的意思 esearpment的意思 ESEC的意思 ESECUTION的意思 ESE的意思 ESE,E.S.E.,e.s.e.的意思 ESEG的意思 esehabachia satoi的意思 esein的意思 Esek的意思 Eseka的意思 ESEL的意思 E Selectin的意思 eselin的意思 ESEM的意思 ESEMED的意思 E. semiserrulata的意思