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.
Allergic Responses. One of the major disadvantages of GMO corn is its potential to trigger allergies. First, genetic material from a potentially allergenic food may be transferred to corn, also transferring the allergenic properties.MO sweet corn also has a potentially negative impact on the environment. GM plants can cross-pollinate with nearby crops, making organic farming difficult. Cross-pollination has eliminated a large portion of heirloom varieties of corn and could contaminate wild plants as well.