O efeito da adubação verde sobre o crescimento e a produtividade do sorgo forrageiro BR 601, foi estudado em experimento desenvolvido na UFERSA, em Mossoró, RN, no qual o delineamento utilizado foi em blocos casualizados completos, em esquema de parcelas subdivididas no tempo com três repetições. Testaram-se sete espécies de leguminosas, Mucuna aterrima, Canavalia ensiformis, Cajanus cajan, Dolichos lab-lab, Crotalaria juncea, Crotalaria spectabilis e Vigna unguiculata, uma mistura das leguminosas mais milho, sorgo e girassol, e a vegetação espontânea, como testemunha. Determinaram-se, para cada tratamento, a quantidade de massa verde, massa seca e teores de N, P, K, Na, Ca e Mg da parte aérea, a partir dos quais foi calculada a quantidade de nutrientes acumulada por hectare. As quantidades de matéria fresca e seca da parte aérea, altura de plantas e número de folhas do sorgo semeado após a incorporação dos adubos verdes, foram avaliadas aos 20, 40, 60, 80 e 100 dias após o plantio. A Mucuna aterrima mostrou-se a melhor opção como adubo verde em virtude de proporcionar os maiores valores das características avaliadas ao final do ciclo do sorgo podendo-se, também, recomendar a Crotalaria juncea e o Dolichos lab-lab, o qual apresentou a maior massa seca e quantidade de nutrientes na parte aérea.
Brazil is the world's largest sweet orange producer, but production in the state of Acre is small and does not meet the local demand, despite having climatic conditions that are adequate for its cultivation. The objective of this study was to evaluate the behavior of the 'Pera' orange using different rootstocks under the edaphoclimatic conditions of Rio Branco, Acre, Brazil. We grafted the scion of the 'Pera' orange onto nine citrus rootstocks: 'Cleopatra' mandarin, TSKFL x CTTR-013, LVK x LCR-038, TSKC x CTQT 1439-004, LVK x LVA-009, 'Indio'citrandarin, 'Santa Cruz Rangpur' lime, TSKFL x CTC-25-002, and TSKC x CTSW-038. The experiment was organized in a random block design with three replicates and two plants per parcel. The following characteristics were evaluated: compatibility between scion and rootstocks, tolerance to drought, production and fruit quality. There was an effect of the rootstocks on the behavior of the 'Pera' variety. The 'Santa Cruz Rangpur' lime, 'Indio' citrandarin, and the hybrid LVK x LCR-038 rootstocks presented the best performance of the 'Pera' orange. Therefore, they constitute an alternative to the 'Rangpur' lime and may be incorporated into the current 'Pera' orange production system of the region.
The characterization and evaluation of banana genotypes (Musa spp.) is an important step both for breeding programs and for indication to farmers. Thus, the objective of this work was to evaluate banana genotypes in Rio Branco-Acre, aiming at their incorporation into the region 's production systems. The experiment was carried out in a randomized complete block design in a subdivided plots scheme with five replicates and four plants per plot. The treatments of the plots were the three production cycles, and the subplots were the nineteen banana genotypes. We evaluated plant's height; perimeter of the pseudostem base; number of active leaves at the inflorescence and harvesting stage; the period from planting until flowering, the period from flowering until harvest and period from planting until harvest; the mass of the bunch, the total number of fruits per bunch; the number of pieces; productivity. The genotypes Thap Maeo, FHIA-02, FHIA-18, and Maravilha, present the best agronomic performance and have the potential to be incorporated into the banana production system in the edaphoclimatic conditions of the Rio Branco, Acre region.
O objetivo deste trabalho foi avaliar o potencial degradador in vitro de fungos causadores de podridão branca em serragem de clones de eucalipto. As espécies fúngicas de podridão branca utilizadas nos testes in vitro foram: Pycnoporus sanguineus, Phellinus gilvus e Schizophyllum commune. O experi-mento foi realizado em arranjo fatorial 3 x 3, disposto em delineamento inteiramente casualizado. Os parâmetros analisados foram: diâmetro do crescimento micelial (cm), velocidade de crescimento (cm dia-1), densidade micelial dos isolados fúngicos e perda de massa da serragem (%). Os isolados Phelli-nus gilvus e Pycnoporus sanguineus apresentaram maior velocidade de crescimento e resultaram em maior perda de massa da serragem em relação ao Schizophyllum commune. Pycnoporus sanguineus apresentou maior adensamento micelial que os demais isolados em todos os clones testados. Dentre os clones testados, o 2361 foi o que resultou em menor velocidade de crescimento dos isolados fún-gicos e menor perda de massa da serragem, mas favoreceu a formação de micélio mediamente a forte-mente adensado em todos os isolados fúngicos. Dos isolados testados, Pycnoporus sanguineus e Phe-llinus gilvus foram os mais eficientes na degradação in vitro da serragem de eucalipto. Palavras-chave: biodegradação, basidiomicetos, eucalipto Evaluating the degradation potential of white-rot fungi AB S TR ACT The objective of this work was to evaluate the in vitro degrading potential of white-rot fungi in sawdust of eucalyptus clones. The white-rot fungi species tested were: Pycnoporus sanguineus, Phe-llinus gilvus and Schizophyllum commune. The experiment was carried out in factorial arrangement 3 x 3, displayed in a completed randomized design. The analysed parameters were: diameter of the mycelial growth (cm), speed of growth (cm day-1), mycelial density of the fungal isolate and loss of sawdust mass (%). The isolated Pycnoporus sanguineus and Phellinus gilvus presented higher speed growth and resulted in higher loss of sawdust mass when compared to Schizophyllum commune. Pycnoporus sanguineus presented the highest mycelial density in all clones tested. Clone 2361 resulted in the smallest fungal isolate growth and smaller loss of sawdust mass, but it favored the formation of moderately and highly dense mycelial in all isolates. The most efficient in in vitro degradation of eucalyptus sawdust was achieved with Pycnoporus sanguineus and Phellinus gilvus.
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