Fertilização fosfatada no desempenho agronômico e acúmulo de nutrientes do meloeiro
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Data
2013-02-25
Autores
Mendoza Cortez, Juan Waldir [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi avaliar duas cultivares de meloeiro ‘Olimpic express’ - grupo cantaloupe, e ‘Iracema’ - grupo amarelo, as doses de fósforo e quantificar o crescimento e o acúmulo de macronutrientes. No primeiro trabalho, que constou de dois experimentos independentes para cada cultivar, o delineamento experimental utilizado foi em blocos casualizados, com seis tratamentos (0, 50, 100, 200, 300 e 400 kg ha-1 de P2O5) e cinco repetições. Verificaram-se efeitos significativos do P no teor foliar deste nutriente, no número e produtividade de frutos comerciais, e no teor de P no solo pelos métodos de resina de troca aniônica (RTA) e Mehlich-1, para ambas cultivares. No melão ‘Olimpic express’, o número máximo de frutos comerciais (NFC) (18.230 frutos ha-1) e produtividade comercial (PC) (28,9 t ha-1) foram obtidos com 319,5 e 310,0 kg ha-1 de P2O5 respectivamente. Por outro lado, para o melão ‘Iracema’ foram necessários 400 kg ha-1 de P2O5 para maximizar o NFC (20.361 frutos ha-1) e PC (35,5 t ha-1). Para o melão ‘Olimpic express’, a dose ótima econômica (DOE) de P foi 306 kg ha-1 de P2O5, portanto, muito próxima à dose de P que maximizou o NFC e PC. Para ‘Iracema’ não foi possível calcular a DOE, pois a PC ajustou-se à equação linear e não foi alcançada a máxima PC. Os teores de P no solo e na folha do melão ‘Olimpic express’ correspondentes a máxima PC foram 50 mg dm-3 (RTA); 45 mg dm-3 (Mehlich-1) e 3,2 g kg-1, e no melão ‘Iracema’ foram 46 mg dm-3 (RTA); 51 mg dm-3 (Mehlich-1) e 3,2 g kg-1. O segundo trabalho foi realizado em blocos casualizados, com sete tratamentos (épocas de amostragens para cada cultivar) e três repetições. As amostragens foram realizadas aos 14, 21, 28, 35, 42, 49 e 56 dias...
The objective of this research was to evaluate phosphorus doses in two melon cultivars, ‘Olimpic express’ - cantaloupe group, and ‘Iracema’ - yellow group, and quantify the plants growth and nutrients accumulation. In the first research, which consisted of two independent experiments for each cultivar, the experimental design was randomized complete blocks with six treatments (0, 50, 100, 200, 300 and 400 kg ha-1 P2O5) and five replications. P level in the plant leaves, the number and yield of commercial fruits, P level in the soil (as determined by the methods of anionic exchange resin (RTA) and Mehlich-1) were significantly affected by P doses for both cultivars. The maximum number of commercial fruits (NFC) (18,230 fruits ha-1) and the commercial productivity (PC) (28.9 t ha-1) of the ‘Olimpic express’ variety were achieved when P2O5 doses were, respectively, of 319.5 and 310 kg ha-1. On the other hand, NFC and PC (20,361 fruits ha-1 and 35.5 t ha-1, respectively) of the ‘Iracema’ cultivar were reached when P2O5 dose was of 400 kg ha-1. The optimum economic dose (DOE) for the ‘Olimpic express’ melon was of 306 kg ha-1 of P2O5, that is, very close to the dose that permitted the highest NFC and PC. For the ‘Iracema’ cultivar, it was not possible to find the DOE since PC showed to adjust itself to a linear equation so that the maximum PC was not reached. P levels in the soil and in the leaves of the ‘Olimpic express’ cultivar corresponding to the maximum PC were of 50 mg dm-3 (RTA), 45 mg dm-3 (Mehlich-1), and 3.2 g kg-1 and for the ‘Iracema’ variety of 46 mg dm-3 (RTA), 51 mg dm-3 (Mehlich-1), and 3.2 g kg-1. The second research was done in randomized complete blocks with seven treatments (sampling moments for each cultivar) and three... (Complete abstract click electronic access below)
The objective of this research was to evaluate phosphorus doses in two melon cultivars, ‘Olimpic express’ - cantaloupe group, and ‘Iracema’ - yellow group, and quantify the plants growth and nutrients accumulation. In the first research, which consisted of two independent experiments for each cultivar, the experimental design was randomized complete blocks with six treatments (0, 50, 100, 200, 300 and 400 kg ha-1 P2O5) and five replications. P level in the plant leaves, the number and yield of commercial fruits, P level in the soil (as determined by the methods of anionic exchange resin (RTA) and Mehlich-1) were significantly affected by P doses for both cultivars. The maximum number of commercial fruits (NFC) (18,230 fruits ha-1) and the commercial productivity (PC) (28.9 t ha-1) of the ‘Olimpic express’ variety were achieved when P2O5 doses were, respectively, of 319.5 and 310 kg ha-1. On the other hand, NFC and PC (20,361 fruits ha-1 and 35.5 t ha-1, respectively) of the ‘Iracema’ cultivar were reached when P2O5 dose was of 400 kg ha-1. The optimum economic dose (DOE) for the ‘Olimpic express’ melon was of 306 kg ha-1 of P2O5, that is, very close to the dose that permitted the highest NFC and PC. For the ‘Iracema’ cultivar, it was not possible to find the DOE since PC showed to adjust itself to a linear equation so that the maximum PC was not reached. P levels in the soil and in the leaves of the ‘Olimpic express’ cultivar corresponding to the maximum PC were of 50 mg dm-3 (RTA), 45 mg dm-3 (Mehlich-1), and 3.2 g kg-1 and for the ‘Iracema’ variety of 46 mg dm-3 (RTA), 51 mg dm-3 (Mehlich-1), and 3.2 g kg-1. The second research was done in randomized complete blocks with seven treatments (sampling moments for each cultivar) and three... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Melão - Cultivares, Melão - Nutrição, Fertilizantes fosfatados, Fósforo, Desempenho, Nutrientes, Melons
Como citar
MENDOZA CORTEZ, Juan Waldir. Fertilização fosfatada no desempenho agronômico e acúmulo de nutrientes do meloeiro. 2013. xiii, 49 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, 2013.