Amostragem de folhas em cafeeiro para fins de diagnose do estado nutricional
Carregando...
Data
2012-06-21
Autores
Cintra, Antonio Carlos de Oliveira [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
O café é um dos principais produtos na pauta das exportações agrícolas, constituindo-se numa das mais importantes fontes de divisas para a economia brasileira. Além disso, a cafeicultura tem importante papel social no país, empregando considerável volume de mão-de-obra, devido à exigência da cultura em relação aos tratos culturais. A análise foliar é uma importante ferramenta para auxiliar no aumento de produtividade das culturas perenes em geral e, particularmente para o cafeeiro, sendo imprescindível conhecer o tamanho ideal da amostra de folhas a ser coletada, a fim de otimizar a mão-de-obra e diminuir os erros inerentes aos critérios de diagnose do estado nutricional. Neste sentido, este trabalho teve como objetivo determinar em lavouras comerciais de café com idades entre 8 e 12 anos, instaladas em Latossolo Vermelho Distrófico, submetidas a dois regimes hídricos, o tamanho de amostras foliares e a variação do erro amostral para a diagnose do estado nutricional da cultura. Foi utilizado o delineamento experimental inteiramente casualizado, composto por quatro tratamentos que constaram da amostragem de folhas em 5, 10, 20 e 40 plantas de cafeeiro e cinco repetições, no sistema de sequeiro e irrigado. Concluiu-se que para a determinação de macronutrientes, a amostragem de folhas em 10 e 20 plantas por unidade amostral nos sistemas irrigado e sequeiro respectivamente, são suficientes para manter o erro amostral menor que 10%. Para realizar as determinações químicas de macro e micronutrientes, 20 plantas são suficientes para manter o erro na estimativa da média amostral menor que 10% no sistema irrigado e sequeiro, exceto para o Cu e Mn que necessitam de amostragem superior a 40 plantas no sistema de sequeiro
Coffee is one of the main products on the list of agricultural exports, becoming one of the most important sources of foreign exchange for the Brazilian economy. Additionally, coffee has an important social role in the country, employing considerable amount of manpower due to the requirement of culture in relation to cultural practices. The leaf analysis is an important tool to help increase productivity of perennial crops in general and, particularly for coffee and is essential to know the ideal size of a leaf sample to be collected in order to optimize the manpower and reduce errors inherent in the criteria for diagnosis of nutritional status. This study aimed to determine in 8-12 years-old commercial crops of coffee, installed in Oxisol submitted to two water regimes, the size of leaf samples and the variation of sampling error for the diagnosis of nutritional status of plants coffee. A completely randomized design, consisting of four treatments was used, that consisted of leaf sampling at 5, 10, 20 and 40 coffee plants and five repetitions, to with and without irrigation system. To determination of macronutrients, the sample sheets 10 and 20 plants per unit sample with and without irrigation systems respectively, was sufficient to maintain the sample error less than 10. To determine chemical analysis of macro and micronutrients, 20 plants were enough to keep the error in estimating the sample mean less than 10% in the with and without irrigation systems, except for Cu and Mn that need more than 40 plants without irrigation system
Coffee is one of the main products on the list of agricultural exports, becoming one of the most important sources of foreign exchange for the Brazilian economy. Additionally, coffee has an important social role in the country, employing considerable amount of manpower due to the requirement of culture in relation to cultural practices. The leaf analysis is an important tool to help increase productivity of perennial crops in general and, particularly for coffee and is essential to know the ideal size of a leaf sample to be collected in order to optimize the manpower and reduce errors inherent in the criteria for diagnosis of nutritional status. This study aimed to determine in 8-12 years-old commercial crops of coffee, installed in Oxisol submitted to two water regimes, the size of leaf samples and the variation of sampling error for the diagnosis of nutritional status of plants coffee. A completely randomized design, consisting of four treatments was used, that consisted of leaf sampling at 5, 10, 20 and 40 coffee plants and five repetitions, to with and without irrigation system. To determination of macronutrients, the sample sheets 10 and 20 plants per unit sample with and without irrigation systems respectively, was sufficient to maintain the sample error less than 10. To determine chemical analysis of macro and micronutrients, 20 plants were enough to keep the error in estimating the sample mean less than 10% in the with and without irrigation systems, except for Cu and Mn that need more than 40 plants without irrigation system
Descrição
Palavras-chave
Café - Nutrição, Analise foliar, Café, Plantas - Nutrição, Coffee
Como citar
CINTRA, Antonio Carlos de Oliveira. Amostragem de folhas em cafeeiro para fins de diagnose do estado nutricional. 2012. xi, 34 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Ciências Agrárias e Veterinárias, 2012.