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4. Núcleo de Pesquisa sobre Crianças, Adolescestes e Jovens - Universidade Federal do Piauí - NUPEC/UFPI - Cosecha

Título :	Nitrogen fertilization and leaf sampling criteria potato crop Adubação nitrogenada e critérios de amostragem foliar para a cultura da batata
Palabras clave :	Solanum tuberosum;leaf diagnosis;plant nutrition;Solanum tuberosum;diagnose foliar;nutrição de plantas
Editorial :	Federal University of Piauí
Descripción :	The present study aimed to determine which leave will be displayed and the time of collection of this leave. The treatments consisted on five doses of nitrogen, four times for collection sampling and three types of leaves, arranged in a randomized block design with three repetitions, totalizing one hundred and forty-four experimental units. The leaves collections took place every fifteen days at thirty, forty-five, sixty and seventy five days after budbreak (DAB), collecting the laminated / compound young leaf (first leave), newly mature (second leave) and the mature leave (third leave) from the set of terminal leaflets. For this was installed an experiment with the culture of potato (cv. Atlantic), in Barretos/SP, the period of march the june of 2010. According to this data collected in this study, the best time for collecting the leaves is at 30 days after the budbreak of the potato cultivation containing nitrogen concentrations in the leaves minus heterogeneous of plants from a fraction to another and with values R2 = 0.98 being higher to the all times of harvests. To the diagnostic leaf, the highest determination coefficient was observed in the newly mature (second leaf) with R2 = 0.98. It can be observed that the highest levels of nitrogen were found on the first leaf (39.01 kg-1). Nevertheless, the values were very heterogeneous and did not fit the curve being the second leave (newly mature) the one that best represents the nutritional status of the plant. Therefore the recommendation for nutritional diagnosis will collect the recently matured leaves (2nd leaf) 30 days after budbreak. O presente trabalho teve como objetivo avaliar a adubação nitrogenada na cultura da batata e determinar a folha e a época de amostragem foliar adequada para avaliação do estado nutricional da cultura. Os tratamentos foram constituídos de 5 doses de nitrogênio, 4 épocas de coleta e 3 tipos de folhas, dispostos em um delineamento em blocos ao acaso, com 3 repetições. As coletas das folhas foram realizadas a cada 15 dias, aos 30, 45, 60 e 75 dias após a brotação (DAB), coletando-se a primeira, segunda e terceira folha recém-madura da planta. Para isto foi instalado um experimento com a cultura da batata (cv. Atlantic), em Barretos/SP, no período de março a junho de 2010. De acordo com os dados coletados neste estudo, a melhor época para a coleta de folhas é aos 30 dias após a brotação da cultura da batata contendo teores de nitrogênio nas folhas menos heterogêneos de plantas de uma parcela para outra e com valor R2 = 0,98, sendo superior a todas as épocas de coleta. Para a folha diagnóstica o maior coeficiente de determinação foi verificado para a folha recém-madura (folha 2ª) com R2 = 0,98. Nota-se que os maiores teores de nitrogênio encontram-se na folha 1ª (39,01 g kg-1), entretanto os valores foram muito heterogêneos e não se ajustaram a curva sendo a folha 2ª (recém-madura) que melhor representa o estado nutricional da planta. Portanto a recomendação para diagnose foliar será coletar a folha recém-madura (folha 2ª) aos 30 dias após a brotação. Nitrogen fertilization and leaf sampling criteria potato cropThe present study aimed to determine which leave will be displayed and the time of collection ofthis leave. The treatments consisted on five doses of nitrogen, four times for collection samplingand three types of leaves, arranged in a randomized block design with three repetitions, totalizingone hundred and forty-four experimental units. The leaves collections took place every fifteen daysat thirty, forty-five, sixty and seventy five days after budbreak (DAB), collecting the laminated /compound young leaf (first leave), newly mature (second leave) and the mature leave (third leave)from the set of terminal leaflets. For this was installed an experiment with the culture of potato (cv.Atlantic), in Barretos/SP, the period of march the june of 2010. According to this data collectedin this study, the best time for collecting the leaves is at 30 days after the budbreak of the potatocultivation containing nitrogen concentrations in the leaves minus heterogeneous of plants froma fraction to another and with values R2 = 0.98 being higher to the all times of harvests. To thediagnostic leaf, the highest determination coefficient was observed in the newly mature (secondleaf) with R2 = 0.98. It can be observed that the highest levels of nitrogen were found on the firstleaf (39.01 kg-1). Nevertheless, the values were very heterogeneous and did not fit the curve beingthe second leave (newly mature) the one that best represents the nutritional status of the plant.Therefore the recommendation for nutritional diagnosis will collect the recently matured leaves (2ndleaf) 30 days after budbreak.
URI :	http://biblioteca-repositorio.clacso.edu.ar/handle/CLACSO/77509
Otros identificadores :	https://comunicatascientiae.com.br/comunicata/article/view/76 10.14295/cs.v3i1.76
Aparece en las colecciones:	Núcleo de Pesquisa sobre Crianças, Adolescestes e Jovens - Universidade Federal do Piauí - NUPEC/UFPI - Cosecha

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