New Weed Fighting Methods
Farmers first used cultivation to mechanically kill weeds. Hand hoeing, pulling weeds, then horse and tractor driven cultivators. Then they started using chemicals starting with 2-4D to chemically kill broad leaf weeds. New chemicals were developed and then came along glyphosate (Roundup) which became the most popular herbicide, especially when the glyphosate resistant gene was introduced into many crops. But like all new innovations, sooner or later they are replaced due to limitations. Cultivation disturbed the soil and took a lot of fuel and time. Every time you disturb soil, you replant weed seed and you lose carbon in the form of soil organic matter. There can be as many as several hundred thousand weed seeds per square yard in soil. This weed seed can remain viable for a few years, a decade, or even longer. Weed seed with thicker coats and buried deep with tillage survive longer than those left on the soil surface with no-till. On the chemical herbicides, herbicide resistan...