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FOUR MAIN CAUSES OF SOIL ACIDIFICATION The four main c FOUR MAIN CAUSES OF SOIL ACIDIFICATION The four main c

FOUR MAIN CAUSES OF SOIL ACIDIFICATION The four main c - PDF document

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FOUR MAIN CAUSES OF SOIL ACIDIFICATION The four main c - PPT Presentation

Obviously the main aim of any agricultural production system is to produce saleable products However most agricultural products are slightly alkaline so their removal from a paddock or farm leaves the soil slightly more acidic The degree of acidific ID: 53654

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FOUR MAIN CAUSES OF SOIL ACIDIFICATIONbuild up in organic matterRemoval of product. saleable products. However most agriculturalacidic. The degree of acidification will depend onremains largely in balance. The most acidifyingsuch as lucerne hay cutting. For instance theof lime to neutralise the resulting acidity. Leaching of nitrogen.acidity. Nitrate is a major nutrient for plantgrowth. It is supplied either from nitrogenouslegumes. When there is more nitrate than the plantsystem. This leaves the soil more acidic. Leaching of nitrate can happen throughinappropriate use of nitrogen fertilisers and is morePastures based on annual species, the use oflong fallow in crop rotations and heavy applicationsUse of nitrogenous fertilisers.varies according to the type of fertiliser. The most IS A NATURAL PROCESSmillions of years. The acidity of any soillocal climate. As a result some soils can beTHE RATE OF SOILACIDIFICATION INCREASES WITH AGRICULTURAL ACTIVITIESWhile many NSWsoils are naturally acid mostsoil acidification. The reasons for this increasedcauses of soil acidity. ACTIONAn initiative of NSW Government LEAFLET NO.5 nitrogenous fertiliseracidity in horticulture. diammonium phosphate (DAP). Less acidifyingSuperphosphate has no direct affect on soil pH.However, its application stimulates growth oflegumes and clovers which fix nitrogen. ThisBuild-up of organic matter.pastures, particularly subterranean clover, hasincreased the amount of organic matter in the soil.While organic matter has many beneficial effectsamount of organic matter may make the soil moreHowever, organic matter will not build upindefinitely, and when an equilibrium is reachedNB. It is important to differentiate between anatural build up in organic matter and the buildup that occurs by adding organic material fromanother site. Where organic matter build upoccurs due to transported material the increasedorganic matter generally increases pH (less acid). The information contained in this publicationat the time of writing (July 1999). However,are reminded of the need to ensure thatinformation upon which they rely is up todate and to check currency of the informationWales Department of Agriculture or the user'sindependent adviser. IN FARMING SYSTEMSCroppinga cropping system. Build up of soil organic mattersecondary factors. The relative importance of/ crop rotation. Use of nitrogenous fertilisers andfertiliser.organic matter are the major causes. Productnitrogen fertilisers not applicable. It should beHorticulture.outlets. This is where nitrogen is applied via thewatering system. Excess use of nitrogen fertiliser, This pamphlet is one of a series on Acid Soil Management prepared for the New South Wales Acid Soil Action Program. Ñ especially lucerne Ñwill increase soil acidity,