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.
Bt. n. A soil bacterium (Bacillus thuringiensis) that produces proteins toxic to certain insects.It has been used as an insecticide, and genes for the toxins have been incorporated into genetically modified crop plants to control insect pests.[From New Latin.t. n. A soil bacterium (Bacillus thuringiensis) that produces proteins toxic to certain insects.