Biocarvão e pó de serra no cultivo do Feijão-Caupi (Vigna unguigulata) em solo de terra firme da Amazônia Central
Grain production of short cycle species in the Amazonian mainland environment is limited mainly by the low natural fertility of soils. An experiment was carried out in a dystrophic Oxisol at Experimental Station of Inpa Tropical Fruit Production, BR 174, Manaus municipality, in the year 2016. The nu...
| Autor principal: | Cedano, Johnny Carlos Campos |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5347 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K8564883D6 |
| Resumo: |
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Grain production of short cycle species in the Amazonian mainland environment is limited mainly by the low natural fertility of soils. An experiment was carried out in a dystrophic Oxisol at Experimental Station of Inpa Tropical Fruit Production, BR 174, Manaus municipality, in the year 2016. The nutrient supply for the crop was investigated with the combined addition of increasing doses of sawdust and biochar at the levels of 0, 40, 80 and 120 t ha-1. The cultivar of cowpea (Vigna unguiculata) was "BRS Novaera", planted by direct seeding with spacings of 0.50 x 0.25 m. The experimental units were 5 x 5 m, totaling 25 m2 and the crop cycle was completed at 84 days. The experimental design was a randomized block design, with a 4 x 4 factorial arrangement, constituting 16 treatments, with three replications. At harvest the plants were evaluated for the number of nodules formed and the biomass of the aerial part, roots, total and of the nodules after drying in a greenhouse at 65º for 72 hours. After harvest, nutrient concentration in the leaves was determined for N, P, Ca, K, Mg, Fe, Zn and Mn, and estimates of crop yield were made. The addition of biochar and sawdust to the soil was determinant for cowpea affecting its development, natural nodulation and mineral nutrition in response to the addition of biochar and sawdust, with greater influence of biochar. The biochar favored the development and nodulation of the plants at the dose of 40 t ha-1, with grain yield of 2.1 t ha-1. For sawdust, this yield was obtained at a dose of 80 t ha-1. The interaction between sawdust and bio-carbon also affected the uptake of Fe, Zn and Mn in the leaves of cowpea and the addition of 120 t ha-1 of biochar also increased the uptake of Ca by plants. For the sawdust, there was favor in the absorption of N and P at the level of 120 t ha-1, but also of Fe at the dosage of 40 t ha-1 and the Zn at levels higher than 80 kg ha-1. |