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.
Bt corn is a variant of maize that has been genetically altered to express one or more proteins from the bacteria Bacillus thuringiensis. The protein is poisonous to certain insect pests and is widely used in organic gardening. The European corn borer causes about a billion dollars in damage to corn crops each year.
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.