Calcium-treated and untreated apple. At left is a calcium-treated apple without blemishes. At right,bitter pit disease has mottled the skin of an untreated apple. Once thought to be a disease,this condition is caused by calcium deficiency. Apple trees are sprayed with calcium chloride or calcium nitrate during the growing season to counteract this | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Nichols, Bob / US Department of Agriculture |
Bildgröße: | 3644 px × 2409 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |