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Rates of Chlorimuron Applied in Glyphosate-Tolerant and Sulfonylurea-Tolerant Soybean
Leandro Paiola Albrecht,Alfredo Junior Paiola Albrecht,André Felipe Moreira Silva,Fábio Henrique Krenchinski,Henrique Fabrício Placido,Ricardo Victoria Filho 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.3
Susceptibility to chlorimuron varies according to soybean genotype. STS® (sulfonylurea-tolerant soybean) presents a high tolerance to some sulfonylureas; this feature is determined by semi-dominants alleles, Als1 and Als2. Experiments were conducted in the field for four seasons with two cultivars for season to evaluate the selectivity of chlorimuron rates in post-emergency (V4) of glyphosate-tolerant and sulfonylurea-tolerant soybean. Data analysis made it possible to infer that there was no significant effect on the productivity of the cultivars when they received application in post-emergency, of chlorimuron at the doses used (0, 15, 30, 45, 60, 75, and 90 g ai ha-1). The maximum recommended rate for non-STS cultivars of chlorimuron is 20 g ai ha-1, or 4.5 times less than the maximum rate employed in this study. The soybean cultivars CD 250 RR/STS, CD 236 RR/STS, CD 2630 RR/STS, and BMX Turbo RR/STS were tolerant to the application, in post-emergency (V4) of the herbicide chlorimuron, until the rate of 90 g ai ha-1.
Fabiula Patricia Novakoski,Leandro Paiola Albrecht,Alfredo Junior Paiola Albrecht,André Felipe Moreira Silva,Mateus Dalpubel Mattiuzzi,Tamara Thaís Mundt,Eduardo Seity Furlan Kashivaqui,Felipe Gustavo 한국작물학회 2020 Journal of crop science and biotechnology Vol.23 No.3
Plant lodging is among the factors that limit the productive potential of the soybean crop. Growth regulators or even herbicides may be used in pre- and post-emergence of soybean to minimize the chance of lodging. These products can act to reduce plant height or the number of branches. This study aimed to evaluate the growth and agronomic performance of soybean under the post-emergence application of growth regulators and herbicides. Two experiments were conducted in Palotina, Paraná State (PR), Brazil. A randomized complete block design with four replications was used. Treatments consisted of the application mepiquat chloride, trinexapac, cloransulam, lactofen, and control (without application). Crop injury, chlorophyll indices, and variables related to growth and agronomic performance of soybean crop were evaluated. Post-emergence application of lactofen (36 g a.i. ha −1 ) or cloransulam (33.6 g a.i. ha −1 ) on soybean (V3–V4) reduced the height of soybean plants, but showed no negative eff ect on soybean yield. Therefore, these herbicides are alternatives to reduce the lodging of soybean plants. Post-emergence application of mepiquat chloride (100 g a.i. ha −1 ) was selective to soybean plants, but did not reduce plant growth. Trinexapac application (125 g a.i. ha −1 ) did not reduce plant growth and had a deleterious potential on soybean yield. Therefore, post-emergence application of trinexapac on soybean is not recommended.