II. RESTORATION, EXTRACTION AND USE A. THE GREY SOIL IMPROVEMENTGeneral features of the grey soil is nutrient-poor soils prone to wash, the sour response....., is generally not soil types favourable for agriculture. It occupies the largest area of land in our country, so need to take advantage, improving them to put to use in the agricultural, forestry and industry. The grey soil improvement measures are general purpose improved physical, chemical composition, biology in the soil, bringing the land into use in agriculture, forestry, sustainable high performance.Liming: has the effect of raising the pH and improving physical properties of the soil.Deep plowing are viewed as basic methods to renovate this earth.Study of rational irrigation mode, if not irrigated will make the soil more color silver.The base of each foot of paddy fields, higher low-rotational system of building appropriate improvements.Terraces, planting trees along the same level.Proper manure storage.Rotational crops especially legume crops, green manure crops and food crops.Using biological fertilizers, soil biology.Build banks of the ladies, limiting the process to wash away particles of clay, glue, nutrients for soil silver-gray color.
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