Monday, August 28, 2006

Soil Is Key to Effective Weed Management

The fight against weeds is getting dirty.At Fort Collins, Colo., scientists with the Agricultural Research Service (ARS) are turning to soil to promote weed control.Soil variability, an important factor in treating weed-infested fields, can be gauged by measuring different soils' electrical conductivity (EC).

A soil's EC assesses how easily it allows a current to pass through it. Soils with a higher EC generally have more clay and organic matter and require more herbicide.Farmers can use EC to create herbicide application maps, allowing them to adjust application rates based on variations within the soil. This, in turn, reduces the risk of excessive herbicide leaching while maintaining effectiveness.

Herbicide selection is an equally important aspect of weed control. Dale L. Shaner, a plant physiologist in the Water Management Research Unit at Fort Collins, has shown that atrazine, a widely used herbicide, sometimes breaks down rapidly in fields where it has been used for many years.

This could be the result of bacteria which reduce the herbicide to its elemental parts.Herbicide degradation makes weed control difficult, so farmers have to spend more time and money to apply additional herbicide. An inexpensive field kit could help farmers and crop consultants identify whether fields are at risk before they apply atrazine.

Shaner and his colleagues are investigating whether test strips used to analyze water for atrazine\'s presence could be modified to test the soil. Though a field kit is still in the early stages of development, Shaner believes it could help reduce herbicide overdose.



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AGRI-INFO/AUGUST 28, 2006



TITLE: SOIL IS KEY TO EFFECTIVE WEED MANAGEMENT


ALAM BA NINYO KUNG ANO ANG MAITUTURING NA MABISANG PANLABAN O PANGONTROL SA PAGTUBO NG MGA DAMO SA ATING LUPANG SAKAHAN?

ITO AY ANG PAGGAMIT MISMO SA PABAGU-BAGONG KUNDISYON NG LUPAIN NA NATUKLASANG MALAKI O MAHALAGA ANG PAPEL NA MAAARING GAMPANAN LABAN SA MGA PESTENG DAMO.

ANG TINATAWAG NA SOIL VARIABILITY, AY ISANG MAHALAGANG FACTOR SA TREATMENT NG MGA LUPAING BINALUTAN NG PESTENG DAMO.

ANG PABAGU-BAGONG KUNDISYON NG LUPAIN AY MAAARING SUKATIN SA PAMAMAGITAN NG IBAT-IBANG ELECTRIAL CONDUCTIVITY NG LUPANG SAKAHAN.

ANG MGA LUPAING MERONG MATAAS NA EC O ELECTRICAL CONDUCTIVITY AY MERONG MAS MARAMING PUTIK AT ORGANIKO AT MAS KAILANGAN ANG MAS MARAMING HERBICIDE.

MAAARING GAMITIN NG MGA MAGSASAKA ANG ELECTRICAL CONDUCTIVITY PARA MAKALIKHA NG HERBICIDE APPLICATION MAP, PARA MAGING BASEHAN DIN ITO SA ADJUSTMENT NG PAGLALAGAY NG ABONO DEPENDE RIN SA KUNDISYON NG LUPAIN.

SA GANITONG PARAAN AY MABABAWASAN ANG ANUMANG PANGANIB NA MAGKAROON NG SOBRANG HERBICIDE SA LUPANG SAKAHAN HABANG SINISIKAP NA MAMANTINE ANG BISA NITO LABAN SA MGA PESTENG DAMO.

http://www.ars.usda.gov/is/AR/archive/aug06/weeds0806.htm

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