Management of Vineyard Soils
Soil Parent Materials
Parent material refers to material from which the soil has been derived and, in most cases, is of geological origin. The nature of the parent material can have a profound influence on the characteristics of the soil. The color, texture (characterized by the number of various-sized particles, such as sand, silt, and clay), and chemical composition of the soil are closely related to the color, texture, and chemistry of the parent material.
Igneous Rocks
The solidification of molten magma forms igneous rocks, which are the source of all other types of rocks. Some of them are composed almost entirely of quartz, which is distinctly acidic in character, while others contain a high proportion of iron, calcium, magnesium, and other basic elements and are known as basic rocks. They include rocks such as andesite, basalt, diorite, granite, gabbro, rhyolite, syenite, and are generally divided according to the presence of the mineral quartz.
Sedimentary Rocks
Sedimentary rocks are formed when grains and fragments of existing rocks are eroded away by the action of ice, water, and wind, transported elsewhere, and redeposited as sediment. These sediments are often laid down in layers or strata of loose particles of gravel, sand, silt and clay. Over time, the sediments may be consolidated or cemented to form stratified or bedded rocks such as conglomerate, sandstone, siltstone, and claystone. Other sedimentary rocks include chalk, dolomite, gritstone, limestone, mudstone, and shale.
Metamorphic Rocks
Metamorphic rocks are formed from igneous or sedimentary rocks that have undergone transformation due to intense heat or pressure, resulting in changes in their mineralogy and structure. Among the most common of the metamorphic rocks are schist, gneiss, hornfels, marble, talc, phylite, quartzite, serpentine, and slate.
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