Flowering and Frutification of Physalis peruviana L. by Ammonium and Nitrate Application, Vigor and Plant Age

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The consumption and economic value of Cape gooseberry fruit (Physalis peruviana L.) increase due to its flavor, aroma and nutritional and medicinal qualities. The simultaneous application of NH4+ and NO3- ferently to NH4+ and NO3- and age of the plant (shoots with high, medium and low vigor against new plants derived from seed). The study was conducted in a greenhouse; the treatments of the first experiment resulted from the combination of the ratio NH4+/NO3- (0:100, 25:75 and 50:50) and shoot vigor (low, medium and high). In another experiment a new lot of plants derived from seed was used, and with the same ratios NH4+/NO3-. An ANOVA was carried out with the results and treatments means were compared with the Tukey test (p≤0.05). In shoot plants, maximum SPAD readings, number of floral buds, flowers and green fruits were presented in plants with high and medium vigor, and with 25 and 50 % of NH4+ (p≤0.05). In seed plants, the NH4+ increased SPAD readings, number of floral buds, flowers and green fruits (p≤0.05). A joint application of NH4+ and NO3- favors flowering and fructification, but reduces SPAD; in contrast, shoot vigor is not determinative but is consistent over SPAD.

O. Martín Antúnez-Ocampo
Manuel Sandoval-Villa
Gabriel Alcántar-González
Jorge Alvarado-López
J. Elias Sabino-López