In this study, we evaluated the impact of two planting positions of cassava cuttings, cv. ‘Vassourinha’, combined with different times and doses of nitrogen application, on productivity and other agronomic traits. In the experiment, the treatment was completely randomized using a 2 × 3 × 4 factorial scheme with two positions of the cuttings [horizontal (PH) and vertical (PV)], three instances of N application (45, 90, and 135 days after planting), and four doses of N (0, 80, 160, and 240 kg ha-1), with six repetitions. We recorded and evaluated the plant height, number of shoots, stem diameter, biomass of the aerial part, number of commercial roots, the total production, and the collection index. The addition of 240 kg ha-1 N and PH increased plant height and stem diameter but did not affect the number of commercial roots, total production, or the collection index. The treatment involving the addition of nitrogen fertilizer 135 days after planting with 240 kg ha-1 N and planting in the PV provided the highest amount of shoot biomass without influencing crop productivity.
The present work aimed to evaluate the effect of the seedling position and Azospirillum brasilense application on the initial development of cassava. The assay was conduced following a completely randomized experimental design, with factorial arrangement (planting positions [horizontal (HP) and vertical (PV)] and the A. brasilense [with (+Azos) and without (-Azos)]). The sprouting percentage (SP) was evaluated from 11 to 35 days after planting (DAP). After 30 DAP, the following variables were evaluated: sprouts number (SN), sprouts height (SH), number of leaflets (NL), length of leaflets (LL), and vegetative vigor (VV). Cassava plants positioning significantly influenced the initial growth. PV promotes a greater sprouting, 63% in 17 DAP, over the PH which was only 3% of the visible shoots during the same period. Here we show for the first time that PV promoted the highest values ​​combined with -Azos in the variables SH (an increase of 17%) and VV (an increase of 61%). The PH, in combination with +Azos, stimulated the NL in 20%. The sub-division into three VV groups allowed identify the existence of differences among the treatments which were not seen in an independent ANOVA being VV an important variable for the initial growth evaluation in cassava.
O manejo da cultura da mandioca é o que determina o potencial produtivo, sendo em muitos casos negligenciado, por ser considerada uma cultura rústica que responde pouco aos insumos agrícolas. O objetivo deste trabalho foi avaliar o desenvolvimento da mandioca em função da posição da maniva em combinação com Azospirillum brasilense. O delineamento experimental utilizado foi inteiramente casualizado, com desenho fatorial 2x2, sendo um fator o posicionamento [horizontal (PH) e vertical (PV)] e outro a aplicação do A. brasilense [com (+Azos) e sem (-Azos)], com 20 repetições por tratamento. Aos 165 dias após plantio (DAP) foram avaliadas em intervalo de 30 dias as variáveis: diâmetro do caule (DC), número de brotos (NB), altura do broto principal (ABP) e comprimento de folíolos (CF). Aos 285 DAP na coleta final foi avaliado o peso da parte área (PPA), o número de raízes comerciais (NR) e a produção total (PT). Análises multivariada de componentes principais (CP) foi realizado. Os primeiros dois CP retem > 88% da variabilidade dos dados na maioria das variáveis mesuradas. O desenvolvimento morfológico é estimulado a partir dos 165 DAP até os 285 DAP, gerando assim, a maior produtividade da mandioca na associação do PH+Azos. A posição horizontal de plantio é a melhor opção na cultura da mandioca e junto com a fixação e melhor disponibilidade de N pelo A. brasilense promovem o melhor desempenho da cultura.
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