Relationship between chlorophyll meter readings and leaf nitrogen concentration in papaya (Carica papaya L.)
2016
Cavalcante, I.H.L. | Da Silva, G.B. | Santos, E.M. | Lima, A.M.N.
Papaya or pawpaw is native to Central and South America distributed throughout the tropical areas of the worlds, but poorly studied for plant physiology. The portable chlorophyll meter has been used to predict nitrogen (N) requirements to improve N fertilizer management in some fruit crops such as custard apple and passion fruit. Thus, an experiment was carried out to evaluate the relationship between the readings provided by the chlorophyll index and the leaf nitrogen 9N0 concentration in papaya (pawpaw) applied with different N rates (0, 320, 400 and 560 g N per plant). Positive and highly correlations were found between the leaf chlorophyll reading and N content in pawpaw. The satisfactory validation of the linear relationship indicate the potential use of chlorophyll meter to estimate leaf N status of papaya, showing that plants which contained from 36.00 to 36.56 (leaf chlorophyll a ), 11.6-11.96 (leaf chlorophyll b) and 47.65-48-52 (total leaf chlorophyll) are supplied with N adequately.
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