It is often quite difficult to identify a deficiency or toxicity symptom in the field because they never really occur as a single element deficiency or toxicity. Each of the elements are inter dependent and they influence each other within certain ratio’s. One would find for instance that phosphorus toxicity, is expressed as either a [...]
NITROGEN Toxicity Symptoms Plants are dark green in colour with excessive amount of foliage Root growth is restricted Reduced flowering and seed production Plants wilt quickly under water stress situations Susceptible to diseases. Deficiency Symptoms Plants are light green in colour starting at the bottom leaves Restricted growth Leaves are smaller than normal Purple discolouration [...]
