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.
Genetically modified foods are given a negative connotation unfairly. Genetically modified foods are beneficial to the environment, health, and are more durable than normal plants. By engineering the Bt toxin in the genomes of plants, scientists have reduced the need for pesticides.The Bt toxin is only toxic to the insects that eat it. That means only pests are affected.enetically modified foods are beneficial to the environment, health, and are more durable than normal plants. By engineering the Bt toxin in the genomes of plants, scientists have reduced the need for pesticides.