查找当地岩石粉末来源 Finding local sources of gravel dust
Finding local sources of gravel dust
To find gravel-grinding operations in your area, call your local gravel pit (look in the Yellow Pages under "Cement-Wholesale", or "Sand and Gravel") and ask if they have crushed gravel screenings made from mixed rocks, the kind that comes out of river beds - crushed and passed through a 1/4 inch or finer screen. The gravel dust will probably cost from $1-$8.00 per ton plus the cost of transportation if the gravel pit delivers it to your garden. As most of the cost is in transporting the rock dust, having a truck or access to one is an advantage. A cooperative initiative with friends and neighbors would also cut costs down.
查找当地岩石粉末来源
要查找您所在地区的岩石运营商，请致电当地的砂石坑（看在黄页根据“水泥批发”或“砂和石类”），并询问他们是否有由混合岩组成，经筛选的岩石，也就是那种取自河川，然后经由一个小于1/4英寸的筛子选出的岩石。每吨加运输成本可能会花费从$1 - $8.00不等（如果把它直接送到你家花园，那还可能另付运费）。由于大部分的成本其实是花在运费上，有卡车会是一个优势，不过与朋友和邻居的合作也可以削减成本。
The Particle Conversion Chart shows various categories of "soil separates" (ground particles) listed with their diameters in microns (thousandths of a mm.) and their corresponding screen mesh sizes. "Mesh" simply refers to a screen with a given number of holes per inch.
The more finely ground the rock, the more readily microorganisms will have access to the minerals. John Hamaker uses the term "gravel dust" to mean a dust "90% of which will pass through a 200-mesh screen."
You can also contact your local state Aggregate Producers Association, your local county DPW (Department of Public Works), your state DOT (Department of Transportation) Materials Bureau and you can contact the National Aggregate Association (Tel: 1-800-622-1020).
这个颗粒的兑换图表列出了各种类别的“土壤筛选方法”（研细颗粒）及其相应的筛网尺寸，其颗粒直径以微米表示（千分之一毫米）。 “网格”仅仅是指一个每英寸有给定孔的数量的筛面。
岩石磨的越细，对于微生物来说越容易吸收矿物。约翰哈梅克使用“岩石粉末”一词时，意指“90％的岩石粉末通过200个网格。”
您也可以联系您当地的相关政府和协会，当地公共工程部，你的政府交通部和物资局，或你可以与全国（美国）总协会（联系电话：1-800-622-1020 ）。
Particle Conversion Chart
PARTICLE SIZE CONVERSION PARTICLE DIAMETER (MICRONS) MESH
Fine sand 250 - 100 50 - 125
Very fine sand 100 - 50 125 - 250
Silt 50 - 2 250 - 6000
Clay 2 or less 6000 or more
颗粒的兑换图
颗粒尺寸 颗粒直径（微米） 筛网尺寸
细沙 250 - 100 50 - 125
较细沙 100 - 50 125 - 250
淤泥 50 -２ 250 - 6000
粘土 2或更小 6000以上
To find gravel-grinding operations in your area, call your local gravel pit (look in the Yellow Pages under "Cement-Wholesale", or "Sand and Gravel") and ask if they have crushed gravel screenings made from mixed rocks, the kind that comes out of river beds - crushed and passed through a 1/4 inch or finer screen. The gravel dust will probably cost from $1-$8.00 per ton plus the cost of transportation if the gravel pit delivers it to your garden. As most of the cost is in transporting the rock dust, having a truck or access to one is an advantage. A cooperative initiative with friends and neighbors would also cut costs down.
查找当地岩石粉末来源
要查找您所在地区的岩石运营商，请致电当地的砂石坑（看在黄页根据“水泥批发”或“砂和石类”），并询问他们是否有由混合岩组成，经筛选的岩石，也就是那种取自河川，然后经由一个小于1/4英寸的筛子选出的岩石。每吨加运输成本可能会花费从$1 - $8.00不等（如果把它直接送到你家花园，那还可能另付运费）。由于大部分的成本其实是花在运费上，有卡车会是一个优势，不过与朋友和邻居的合作也可以削减成本。
The Particle Conversion Chart shows various categories of "soil separates" (ground particles) listed with their diameters in microns (thousandths of a mm.) and their corresponding screen mesh sizes. "Mesh" simply refers to a screen with a given number of holes per inch.
The more finely ground the rock, the more readily microorganisms will have access to the minerals. John Hamaker uses the term "gravel dust" to mean a dust "90% of which will pass through a 200-mesh screen."
You can also contact your local state Aggregate Producers Association, your local county DPW (Department of Public Works), your state DOT (Department of Transportation) Materials Bureau and you can contact the National Aggregate Association (Tel: 1-800-622-1020).
这个颗粒的兑换图表列出了各种类别的“土壤筛选方法”（研细颗粒）及其相应的筛网尺寸，其颗粒直径以微米表示（千分之一毫米）。 “网格”仅仅是指一个每英寸有给定孔的数量的筛面。
岩石磨的越细，对于微生物来说越容易吸收矿物。约翰哈梅克使用“岩石粉末”一词时，意指“90％的岩石粉末通过200个网格。”
您也可以联系您当地的相关政府和协会，当地公共工程部，你的政府交通部和物资局，或你可以与全国（美国）总协会（联系电话：1-800-622-1020 ）。
Particle Conversion Chart
PARTICLE SIZE CONVERSION PARTICLE DIAMETER (MICRONS) MESH
Fine sand 250 - 100 50 - 125
Very fine sand 100 - 50 125 - 250
Silt 50 - 2 250 - 6000
Clay 2 or less 6000 or more
颗粒的兑换图
颗粒尺寸 颗粒直径（微米） 筛网尺寸
细沙 250 - 100 50 - 125
较细沙 100 - 50 125 - 250
淤泥 50 -２ 250 - 6000
粘土 2或更小 6000以上
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