Final diagnosis


Nitrogen deficiency or excess

Discolouration of the foliage on the plants in the left-hand row that have been given less <b> nitrogen</b> than those fertilised normally (right).
Discolouration of the foliage on the potato plants in the right-hand row that have been given less nitrogen than those fertilised normally (left). <b>Nitrogen deficiency</b>
Discolouration of the foliage on the potato plants in the right. <b>Nitrogen deficiency</b>
Pale green and chlorotic foliage and poor growth due to nitrogen deficiency