A aplicação foliar de molibdênio na fase de enchimento de vagens do feijão-comum pode reduzir a qualidade da semente

Abstract

A aplicação foliar de molibdênio na fase de enchimento de vagens do feijão-comum pode reduzir a qualidade da sementeCom o objetivo de aprimorar a tecnologia de produção de sementes ricas em molibdênio (Mo), foram avaliados os efeitos da aplicação foliar de 600 g ha -1 de Mo na qualidade fisiológica da semente de feijão. Em campo, essa dose de Mo foi aplicada na fase V4 (terceira folha trifoliolada), ou parcelada de duas a quatro vezes e aplicada em V4, R6 (floração), R7 e, ou, R8 (enchimento de vagens). A aplicação de 300 g ha Foliar molybdenum applied to common bean pod filling may reduce seed qualityAiming to improve the technology of producing seed with high Mo content, the effects of 600 g ha -1 of foliar-applied Mo on common bean seed quality were evaluated. In the field, this Mo rate was applied at the V4 growth stage (third trifoliolate leave) or divided into two or four rates applied at V4, R6 (flowering), R7 and/or R8 (pod filling). Mo (300 g ha -1) applied at R6 did not affect seed quality relative to control (90 g ha -1 of Mo applied at V4). In the three treatments in which 200, 255 or 300 g ha -1 of Mo were applied at R7, only in one (255 g ha -1 ) Mo decreased seed germination and vigor relative to control. When 200, 255 or 300 g ha -1 of Mo were applied at R8 (five treatments), in general, Mo decreased seed germination and, in two cases, also seed vigor relative to control. It was concluded that 255 g ha -1 of Mo applied at R7 and, especially, doses of 200 g ha -1 of Mo or higher applied at R8 can reduce common bean seed quality.

<b>Split application of molybdic fertilizer at the reproductive stage of common bean increases the molybdenum content in seed

“…at the R8 stage may reduce seed quality (Vieira et al, 2015). In future studies, doses lower than 200 g Mo ha -1 applied at the R8 stage should be included as a treatment when trying to improve Mo accumulation in seed.…”

“…The efficacy of Mo application during the reproductive stage of the common bean has not been confirmed in controlled studies. In a study conducted in the Zona da Mata region, 200 to 300 g Mo ha -1 sprayed at the R8 stage (pod filling) of the common bean reduced seed quality as evaluated by germination and accelerated aging tests (Vieira et al, 2015). Thus, Mo application at the common bean's reproductive stage should concentrate on R5 (pre-flowering), R6 (flowering) and R7 (pod formation) stages in trying to improve SMoC.…”

Split applications of molybdenum fertilizer on common bean increase molybdenum in seed

“…In the study by Vieira et al (2016), Mo was applied at V4, R5 (bud initiation), and R7 (pod formation) growth stages. According to Vieira et al (2015), application of Mo at the seed filling (R8) growth stage should be avoided due to the risk of reducing seed physiological quality (germination and vigor). Vieira et al (2016) found that seed vigor was greater with 100 g ha −1 than with 600 g ha −1 of Mo in one trial.…”

Seeds enriched with molybdenum improve cowpea yield in sub‐humid tropical regions of Brazil

“…Therefore, although with a final stand density 19% lower than that obtained with low-Mo seeds (Figure 1d), plants raised from high-Mo seeds yielded 42% more than those originated from low-Mo seeds (Figure 1e). The lower stand density for plants raised from high-Mo seeds may be due to the 400 g ha −1 of Mo applied at the pod-filling stage of the plants from which high-Mo seeds were harvested, as long as, according to Vieira et al (2015), over 200 g ha −1 of Mo applied at common bean pod-filling may have decreased the quality of the seeds. Thus, the effects of rates and split application of Mo in different cowpea reproductive growth stages on both seed Mo content and seed quality should be evaluated in further studies to improve the technology of pro-ducing Mo-enriched seeds.…”