Physiological indexes of custard apple as a function of nitrogen fertilization and humic substances
Abstract
Custard apple (Annona squamosa L.) is native to tropical America and it occurs spontaneously in the Brazilian northeast region, where it is exploited mainly at subsistence level owing to lack of adequate management and selected genetic material. In this study, we aimed to evaluate the physiological characteristics of custard apple as a function of nitrogen fertilization and application of humic substances in the municipality of Bom Jesus, Piaui state, Brazil. We adopted a randomized block experimental design with treatments arranged in a 4 × 2 factorial scheme, referring to four doses of nitrogen and the presence and absence of humic substances (Humitec®). The following variables were evaluated: leaf area index (LAI), chlorophyll (A, B, and Total), and photosynthetic active radiation (PAR). The maximum agronomic efficiency for intercepted photosynthetically active radiation was registered under fertilization with 174.70 g/plant of N.
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References
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