One of your classmates is growing tomatoes hydroponically using the Hoagland solution described above, but he/she forgot to add one of the stock solutions. As a result, young leaves developed the symptoms shown in the picture. Based on the key below, which solution is missing? A Key to Nutrient Deficiency Symptoms Element deficient A) Older leaves affected ** = easy, need to know Nitrogen ** Phosphorus Magnesium Potassium Zinc B) Effects mostly generalized over whole plant, lower leaves dry up and die C) Plant light green, lower leaves yellow, drying to brown, stalks become short and slender. C) Plants dark green, often red or purple colors appear, lower leaves yellow, drying to dark green, stalks become short and slender B) Effects mostly localized, mottling or chlorosis, lower leaves do not dry up but become mottled or chlorotic, leaf margins cupped or tucked. C) Leaves mottled or chlorotic, sometimes reddened, necrotic spots, stalks slender C) Mottled or chlorotic leaves, necrotic spots small and between veins or near leaf tips and margins, stalks slender. C) Necrotic spots large and general, eventually involving veins, leaves thick, stalks short. A) Young leaves affected. B) Terminal buds die, distortion and necrosis of young leaves. C) Young leaves hooked, then die back at tips and margins. C) Young leaves light green at base, die back from base, leaves twisted. B) Terminal buds remain alive but chlorotic or wilted, without necrotic spots. C) Young leaves wilted, without chlorosis, stem tip weak. C) Young leaves not wilted, chlorosis occurs D) Small necrotic spots, veins remain green D) No necrotic spots E) Intense chlorosis. Veins can remain green E) Less intense chlorosis, including veins. Calcium Boron Copper Manganese Iron Sulfur
The KNO3 The MgSO4.7H20 solution The NH4H2PO4 solution The NaFeDTPA solution