Produção de mudas de ipê amarelo (Tabebuia chrysotricha Standl.) em função de substratos e de soluções de fertirrigação
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2006-12-04
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Universidade Estadual Paulista (Unesp)
Resumo
O trabalho objetivou estudar a formação de mudas de ipê amarelo (Tabebuia chrysotricha Standl.) em função de quatro substratos, variando as soluções de adubação de cobertura. Para compor os substratos foi utilizada fibra de coco fibrosa e granulada formando os tratamentos 100% fibrosa (100% F), 60% fibrosa e 40% granulada (60% F+40% G), 40% fibrosa e 60% granulada (40% F+60% G) e 100% granulada (100% G). A adubação de base foi igual para todos os tratamentos e as soluções de adubação de cobertura variaram a fim de se obter soluções completas com condutividades elétricas de 1,06 dS m-£, 2,12 dS m-£, 3,2 dS m-£ e 4,24 dS m-£. As sementes foram colocadas diretamente nos tubetes (120mL) contendo os respectivos substratos e receberam as adubações de cobertura por subirrigação uma vez por semana, respeitando-se os tratamentos de adubação. Quando as mudas atingiram aproximadamente 20 centímetros de altura foram realocadas sob tela de 9% de sombreamento, onde permaneceram até o plantio em Taubaté-SP. As análises químicas do substrato (CE e pH) pelo método de extração aquosa 1:1,5 (1 substrato : 1,5 água deionizada), as análises morfológicas (altura de parte aérea, diâmetro de coleto e número de pares de folhas verdadeiras), bem como a matéria seca total foram realizadas quinzenalmente. As análises químicas da parte aérea foram obtidas quando as mudas estavam prontas para expedição. Em praticamente todas as avaliações morfológicas, os substratos contendo fibra de coco granulada, assim como as menores CE das soluções de adubação, formaram mudas mais vigorosas, indicando crescimento mais rápido. As mudas produzidas em substratos 100% F e 2 60% F+40% G apresentaram maiores teores de N, S, B, Mn e Zn na parte aérea. A parte aérea acumulou...
The work aimed to study the formation of Tabebuia chrysotricha Standl. seedlings in function of four substrates, varying the covering fertilization solutions. To compose the substrate it was used fibrous and granulated coconut fiber obtaining the following treatments: 100% fibrous (100% F), 60% fibrous and 40% granulated (60% F+40% G), 40% fibrous and 60% granulated (40% F+60% G) and 100% granulated (100% G). The basis fertilization was the same for all treatments and the solutions of covering fertilization varied in order to obtain complete solutions with electric conductivities of 1,06 dS m-£, 2,12 dS m-£, 3,2 dS m-£ and 4,25 dS m-£. The propagative material was sowed directly in plastic containers (120mL) with the respective substrates. The covering fertilization was received through sub irrigation once a week, respecting the treatments of fertilizations. When the seedlings reached 20cm of height approximately they were replaced under black screen (9% of shading), where they remained until the planting in Taubaté-SP. The chemical analyses of the substrate (EC and pH), through aqueous extraction method 1:1.5 (1 substrate: 1.5 deionized water), the morphologic analyses (aerial part height, stem diameter and pairs true leaves number), as well as the total dry matter, were accomplished each 15 days. The chemical analyses of aerial part were obtained when the seedlings were ready for expedition. In almost every morphologic evaluation, the substrate with granulated coconut fiber, as well as the smallest EC of fertilization solutions, formed seedlings with higher averages, indicating faster growth. The seedlings production in substrate 100% F and 60% F+40% G allowed them to have higher N, S, B, Mn and Zn concentrations in 4 the aerial part. The aerial part accumulated... (Complete abstract, click electronic access below)
The work aimed to study the formation of Tabebuia chrysotricha Standl. seedlings in function of four substrates, varying the covering fertilization solutions. To compose the substrate it was used fibrous and granulated coconut fiber obtaining the following treatments: 100% fibrous (100% F), 60% fibrous and 40% granulated (60% F+40% G), 40% fibrous and 60% granulated (40% F+60% G) and 100% granulated (100% G). The basis fertilization was the same for all treatments and the solutions of covering fertilization varied in order to obtain complete solutions with electric conductivities of 1,06 dS m-£, 2,12 dS m-£, 3,2 dS m-£ and 4,25 dS m-£. The propagative material was sowed directly in plastic containers (120mL) with the respective substrates. The covering fertilization was received through sub irrigation once a week, respecting the treatments of fertilizations. When the seedlings reached 20cm of height approximately they were replaced under black screen (9% of shading), where they remained until the planting in Taubaté-SP. The chemical analyses of the substrate (EC and pH), through aqueous extraction method 1:1.5 (1 substrate: 1.5 deionized water), the morphologic analyses (aerial part height, stem diameter and pairs true leaves number), as well as the total dry matter, were accomplished each 15 days. The chemical analyses of aerial part were obtained when the seedlings were ready for expedition. In almost every morphologic evaluation, the substrate with granulated coconut fiber, as well as the smallest EC of fertilization solutions, formed seedlings with higher averages, indicating faster growth. The seedlings production in substrate 100% F and 60% F+40% G allowed them to have higher N, S, B, Mn and Zn concentrations in 4 the aerial part. The aerial part accumulated... (Complete abstract, click electronic access below)
Descrição
Palavras-chave
Tabebuia, Análise de sobrevivência (Biometria), Viveiros florestais, Condutividade eletrica, Substratos, Electric conductivitie, Forest nursery
Como citar
SARZI, Isabele. Produção de mudas de ipê amarelo (Tabebuia chrysotricha Standl.) em função de substratos e de soluções de fertirrigação. 2006. xiii, 103 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Ciências Agronômicas, 2006.