Sugar content of grapevine leaves affected by nitrogen, phosphorus and potassium fertilization
1982
Mazuelos, C. | Romero, R. | Valpuesta, V. | Sarmiento, R. | Catalina, L. (Consejo Superior de Investigaciones Cientificas, Sevilla (Spain). Centro de Edafologia y Biologia Aplicada del Cuarto)
Grapevine plants, Vitis vinifera L., cv. Palomino, were fertilized with Nitrogen (N, 40 and 80 kg/Ha), Phosphorus (P2O5, 40 and 120 kg/Ha) and Potassium (K2O, 40 and 160 kg/Ha). Total, reducing, non-reducing sugars, glucose and fructose were evaluated in the leaves from visible inflorescence stage to commercial harvest time. There was a peak in total sugar content at flowering, it decreased until ripening of the fruits and finally increased at harvest time. Phosphorus fertilized plants showed a different reducing: non-reducing sugar ratio than the unfertilized control at flowering. At harvest time the N-fertilized plants showed a higher content in reducing sugars of leaves
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