Growth and yielding of tomatoes at copper deficiency
1997
Borkowski, J. (Instytut Warzywnictwa, Skierniewice (Poland))
Paper reviews the literature on copper demand by tomato plants. During summer sunny weather the Cu content ought to be at least 12 mg/kg leaf dry matter; at low insolation (November) the demand is by 50% less. Copper deficiency causes plant wilting in sunny days, losing the buds and flowers and decreases commercial yielding by above 50%. Fast and effective method preventing Cu deficiency is spraying with 0.4% hydrated CuSO4. At deep Cu deficiency the proline content (amino-acid connected with stress) may be 74 times higher than during water deficiency, what suggests that the shortage of copper increases tomato susceptibility for drought
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