Nutrição e adubação da paineira (Ceiba speciosa)
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Data
2014-01-31
Autores
Spada, Grasiela
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Universidade Estadual Paulista (Unesp)
Resumo
A literatura sobre adubação e nutrição de espécies nativas é escassa, as espécies florestais apresentam comportamentos distintos, sobretudo quanto às exigências nutricionais, o desafio deste trabalho foi encontrar qual a melhor condição nutricional para o desenvolvimento da paineira (Ceiba speciosa A. St. Hil). Objetivou-se avaliar e monitorar o crescimento inicial e a nutrição mineral da paineira em resposta a diferentes doses de adubação. O ensaio foi composto por quatro experimentos distintos (doses de N, P, K e V%), cada um com seis tratamentos e quatro repetições dispostos em delineamento inteiramente casualizado, utilizando-se vasos plásticos preenchidos com 50 dm³ de um Latossolo Vermelho Escuro, alocados em estufa plástica. Mensalmente avaliou-se o diâmetro do colo, altura das mudas e teor de clorofila nas folhas. O ensaio foi encerrado 150 dias após o plantio das mudas e além das avaliações anteriores, foram determinados a área foliar, a massa seca de raízes, caules e folhas, e os teores e quantidades absorvidas de macro e micronutrientes pelo material vegetal. Dos elementos estudados, o fósforo é o nutriente mais exigido, sendo que o potássio e o nitrogênio não afetaram o crescimento inicial da espécie. Para o tipo de solo e condições estudadas, recomenda-se adubação fosfatada de 250 mg dm-3 e saturação por bases do solo de 50% para o plantio em condições de campo.
The literature about nutrition and fertilization of native species is scarce, forestry species exhibit different behavior, especially regarding nutritional requirements, the challenge of this work was to find what the best nutritional conditions for the development of the cotton tree (Ceiba speciosa A. St. – Hil). This study aimed to evaluate and monitor the initial growth and mineral nutrition of paineira in response to different doses of fertilizer. The test consisted of four separate experiments (doses of N, P, K and V%), each with six treatments and four replications arranged in a completely randomized design, using plastic pots filled with 50 dm- ³ of a Dark Rhodic Hapludox allocated in greenhouse. Monthly evaluated the lap diameter, plant height and chlorophyll content in the leaves. The research was terminated 150 days after seedlings planting and beyond previous evaluations were determined leaf area, dry weight of roots, stems and leaves, as well as the levels and amounts of macro and micronutrients absorbed by plant material. The elements studied, the phosphorus is the most required nutrient, being that nitrogen and potassium did not affect the initial growth of the specie. For soil type and measurements conditions is recommended phosphorus fertilization of 250 mg dm-3 and liming of 50% for planting under field conditions.
The literature about nutrition and fertilization of native species is scarce, forestry species exhibit different behavior, especially regarding nutritional requirements, the challenge of this work was to find what the best nutritional conditions for the development of the cotton tree (Ceiba speciosa A. St. – Hil). This study aimed to evaluate and monitor the initial growth and mineral nutrition of paineira in response to different doses of fertilizer. The test consisted of four separate experiments (doses of N, P, K and V%), each with six treatments and four replications arranged in a completely randomized design, using plastic pots filled with 50 dm- ³ of a Dark Rhodic Hapludox allocated in greenhouse. Monthly evaluated the lap diameter, plant height and chlorophyll content in the leaves. The research was terminated 150 days after seedlings planting and beyond previous evaluations were determined leaf area, dry weight of roots, stems and leaves, as well as the levels and amounts of macro and micronutrients absorbed by plant material. The elements studied, the phosphorus is the most required nutrient, being that nitrogen and potassium did not affect the initial growth of the specie. For soil type and measurements conditions is recommended phosphorus fertilization of 250 mg dm-3 and liming of 50% for planting under field conditions.
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calagem, recomendação de adubação, crescimento inicial, adubação N P K