Sentences with phrase «level use of an herbicide»

An analysis of data in Illinois has found a link between higher county - level use of an herbicide called glyphosate and reduced abundance of adult monarch butterflies, especially in areas with concentrated agriculture.

Not exact matches

Tropical Traditions has a ZERO tolerance level for GMOs, herbicides, and pesticides, and since the USDA National Organic Program (NOP) allows small residue amounts of pesticides and herbicides approved by the EPA for conventional crops to be present in USDA Organic certified products, we knew that we had to develop our own standards to both use in purchasing products directly from producers, as well as to educate our consumers on our own values and standards.

A research team led by Jeanne Mager Stellman of the Mailman School of Public Health at Columbia University reported in April that the herbicides used to defoliate battle zones contained two to four times the previously reported levels of dioxin, a poison linked to a high incidence of prostate cancer, diabetes, birth defects, and other ailments among American veterans, the Vietnamese, and their descendants.

Elevated atmospheric CO2 is associated with decreased plant nitrogen concentration, and therefore decreased protein, in many crops, such as barley, sorghum, and soy.210, 211,212,213 The nutrient content of crops is also projected to decline if soil nitrogen levels are suboptimal, with reduced levels of nutrients such as calcium, iron, zinc, vitamins, and sugars, although this effect is alleviated if sufficient nitrogen is supplied.214 Fourth, farmers are expected to need to use more herbicides and pesticides because of increased growth of pests215, 216,217,218 and weeds219, 220 as well as decreased effectiveness221 and duration222of some of these chemicals (Ch.

Increased weed and pest pressure associated with longer growing seasons and warmer winters will be an increasingly important challenge; there are already examples of earlier arrival and increased populations of some insect pests such as corn earworm.64 Furthermore, many of the most aggressive weeds, such as kudzu, benefit more than crop plants from higher atmospheric carbon dioxide, and become more resistant to herbicide control.72 Many weeds respond better than most cash crops to increasing carbon dioxide concentrations, particularly «invasive» weeds with the so - called C3 photosynthetic pathway, and with rapid and expansive growth patterns, including large allocations of below - ground biomass, such as roots.73 Research also suggests that glyphosate (for example, Roundup), the most widely - used herbicide in the United States, loses its efficacy on weeds grown at the increased carbon dioxide levels likely to occur in the coming decades.74 To date, all weed / crop competition studies where the photosynthetic pathway is the same for both species favor weed growth over crop growth as carbon dioxide is increased.72