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