Fernández Soto, Gianna Alessandra

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    Estudio de kumquat (𝘍𝘰𝘳𝘵𝘶𝘯𝘦𝘭𝘭𝘢 𝘮𝘢𝘳𝘨𝘢𝘳𝘪𝘵𝘢) injertado en cuatro patrones y evaluación de formulaciones de fertilizantes en distintas dosis para su producción como cítrico ornamental
    (2023-12-05) Fernández Soto, Gianna Alessandra; Rivera Ocasio, Dania; College of Agricultural Sciences; Tirado Corbalá, Rebecca; Alvarado Ortíz, Ada N.; Department of Crops and Agro-Environmental Sciences; Ponce de León González, Leyda
    The main objective of this project was to evaluate the cultivation of Fortunella margarita (Kumquat) for its production as an ornacitrus. Graft survival was compared in four rootstocks ('Cleopatra', 'Flying Dragon', 'HRS-812', and 'Volkameriana'). The graft survival in 'HRS-812' resulted in the highest success with 53%, ‘Volkameriana’ with 29.2%, ‘Cleopatra’ with 11.9%, and 'Flying Dragon' was the lowest with 5.8%. In addition, its development when grafted on 'HRS-812' and cultivated in pots of 11.34 L inside a structure was studied by applying a high and low dosages of two fertilizers formulations: 13-6-9 (low dosage 27 g and high dosage 42 g) and 5-2-6 (low dosage 30 g and high dosage 44 g). The following parameters were evaluated: rootstock stem diameter, graft height and diameter, flower count, number of fruits, and chlorophyll content. The trees treated with the highest dose of the 13-6-9 fertilizer obtained significantly higher means for rootstock diameter, graft height, and diameter. Applying a low dose of this same fertilizer resulted in a higher number of flowers and quantity of fruits. Leaf tissue analysis showed a sufficient range for the macronutrients Ca, S, P, K, Na, and the micronutrients B, Mn, and Zn. There was a deficiency of N and Mg, an excess of Cu and high value of Fe. Tree development grown in pots in the open field was also studied, considering the same parameters, but applying three fertilizers (13-6-9, 15-3-19, and 15-5-15) in two doses: high 142 g, and low 42 g. Higher means for height and number of flowers were obtained when applying the 13-6-9 fertilizer at the highest dose. The rootstock diameter and canopy width had higher means when applying the 15-3-19 fertilizer at the highest dose. There was no difference in graft diameter or number of fruits. When analyzing the leaf tissue, a sufficient range was obtained for the nutrients Ca, S, P, K, B, Mn, and Fe. Nitrogen and Mg were deficient, Zn was low, and Cu was in excess. The amount of chlorophyll was higher when using 13-6-19 for trees grown in the structure and in the open field than the other fertilizers. The pH and electrical conductivity were measured. Most of the treatments remained within acceptable ranges regardless of the fertilizers applied throughout both experiments. Kumquat production is recommended as an ornamental in Puerto Rico using the rootstock 'HRS-812' and the use of 13-6-9 fertilizer in doses of 142 g for the cultivation of Kumquat in pots and including foliar applications of Ca and Mg.