Saturday, July 01, 2006

Gypsum Helps Curb Runoff of Soil Phosphorus

Gypsum was the best performer in an Agricultural Research Service (ARS) study examining the ability of soil additives to curb runoff of phosphorus from farm fields into the nation's waters.

In research led by agronomist David Brauer of the ARS Dale Bumpers Small Farms Research Center in Booneville, Ark., the soft, widely distributed mineral was the only one of the three soil amendments tested that reduced soluble soil phosphorus in a field containing more than 10 times the amount normally found in soils.

The study was done by Brauer, animal scientist Glen Aiken of the ARS Forage-Animal Production Research Unit in Lexington, Ky., soil scientist Daniel Pote of the Booneville center, and colleagues. The researchers examined how well gypsum, alum and ground-up wastepaper kept phosphorus from leaching from farmland.

Testing was done near Kurten, Texas, on land that has received manure applications from dairy and egg-laying operations for more than 40 years.Excessive use of manures and other fertilizers can significantly increase phosphorus amounts in the soil. A valuable crop nutrient, phosphorus can run off and damage waterways by promoting accelerated growth of algae and plants in streams and lakes.

This can deplete oxygen levels in water bodies and adversely impact living aquatic resources.The researchers amended the soil annually for three years. They found that applying 5,000 pounds of gypsum per acre was most effective in reducing soil-test values for phosphorus. According to Brauer, reductions in dissolved reactive phosphorus seemed to be dependent on continual applications of gypsum.

Commonly found in sedimentary environments, gypsum is also a by-product of coal-burning operations.Brauer explained that gypsum curtails the amount of phosphorus loss by promoting the binding together of soil particles, thus reducing phosphorus carried along with sediment. He added that applying wastepaper product containing aluminum, the active ingredient in alum, can effectively curb phosphorus, but the large amounts necessary can be impractical.


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AGRI-INFO/JULY 1, 2006



TITLE: GYPSUM HELPS CURB RUNOFF OF SOIL PHOSPHOROUS


ALAM BA NINYO NA NATUKLASAN NG MGA AGRI-EXPERT NA ANG GYPSUM AY MAITUTURING NA BEST PERFORMER KAUGNAY NG PAGSUSURI GINAWANG PAGSUSURI SA ABILIDAD NG SOIL ADDITIVES NA MAKONTROL ANG RUNOFF O SOBRANG PHOSPHOROUS SA MGA LUPANG SAKAHAN.

SA PANANALIKSIK NA GINAWA SA PANGUNGUNA NI AGRONOMIST DAVID BRAUER, ANG GYPSUM AY NATATANGI SA TATLONG SOIL AMMENDMENTS NA SINURI NG MGA EKSPERTO NA MAY KAKAYANANG BAWASAN ANG SOLUBLE SOIL PHOSPHOROUS NA MERONG 10 BESES NA MAS MATAAS ANG ANTAS KESA SA NORMAL NA KALAGAYAN NG LUPANG SAKAHAN.

ANG IBA PA SA MINERALS NA ISINAILALIM SA PAG-AARAL AY ANG ALUM AT GROUND UP WASTEPAPER.

ANG SOBRANG PAGGAMIT NG MANURE AT IBA PANG FERTILIZER AY NAGRERESULTA SA MATAAS NA PHOSPHOROUS SA LUPA.

ANG PHOSPHOROUS KAPAG SUMOBRA SA SAKAHAN AY NAKAKASIRA SA DALUYAN NG TUBIG DAHIL SA ITO ANG DAHILAN NG MABILIS NA PAGDAMI AT PAGLAKI NG ALGAE AT TANIM SA MGA DALUYAN NG TUBIG.

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