Even if enough Fe is in the soil, deficiency can occur under the following conditions: poorly drained soil, high Ca, high Mn, high pH, high P, high heavy metals, oxygen deficiency. Deficiency symptoms General: Yellow or white areas on youngest leaves. Older leaves remain green.
The Bt corn can produce unpredictable toxins and allergens into food plants and therefore into the final product. Also the Bt corn can be considered unstable as the number of copies of an inserted gene changes through later generations of the Bt corn. The low tillage is also a prime spot for a monoculture in the fields. A monoculture is where all of the crops are the same, so with this it is a perfect situation for weeds.
The general objective is to investigate the potential economic consequences of the continued adoption of genetically engineered corn and soybeans in the United States.his year, with the partial support of an Argentine no-till farming association and the Monsanto Company, we began the evaluation of the potential economic and environmental impacts of the adoption of Bt corn and Roundup Ready soybeans by small scale farmers in the Entre Rios region of Argentina.