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.
sweet corn will drop and markets will become saturated. Production risks are mostly the same for sweet corn as field corn. However, sweet corn has a more limited root system than field corn. Moisture may need to be carefully monitored. Standard sweet corn has a shelf life of one 1 to 2 days without refrigeration. The genetically modified varieties have a longer life of up to two weeks. There is a high risk of spoilage involved with sweet corn