| The impact of herbicides concentrations on photosynthetic characters and production of covered and naked oat |
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| DOI：10.7606/j.issn.1000-7601.2017.06.19 |
| Key Words: herbicide concentration oats photosynthetic characters yield principal component analysis |
| Author Name | Affiliation | | LIU Huan | College of Pratacultural Science, Gansu Agricultural University
Key Laboratory of Grassland Ecosystem, Ministry of Education
Sino-U.S. Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China | | MU Ping | College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China | | ZHAO Gui-qin | College of Pratacultural Science, Gansu Agricultural University
Key Laboratory of Grassland Ecosystem, Ministry of Education
Sino-U.S. Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China | | ZHOU Xiang-rui | College of Pratacultural Science, Gansu Agricultural University
Key Laboratory of Grassland Ecosystem, Ministry of Education
Sino-U.S. Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China |
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| Abstract: |
| In order to investigate the effects of two kinds of post-emergence application herbicides ［Bromoxynil octanoate + MCPA-sodium (BOMS) and Florasulam + flumetsulam (FLF)］ on yield and photosynthetic characteristics of oat, three concentrations of the two herbicides were conducted on covered oat ‘Longyan 3’and naked oat ‘Baiyan 2’ with a single-factor randomized bloke design. The gas exchange parameters of top second leaf in different growth stages and yield components of oat were measured. Further, using comprehensive evaluation, suitable concentration and kinds of herbicides with efficient and safe benefits were screened. The results showed that oat yield increased obviously under higher concentrations of herbicides in the reasonable ranges (BOMS concentration of 675～2 025 mL·hm-2 and FLF concentration of 90～270 mL·hm-2), the highest was up to 34.67% compared with the control. There was a short term stimulation effect of two kinds of post-emergence application herbicides on photosynthetic characters of oat. The chlorophyll content (SPAD), net photosynthetic rate (Pn), transpiration rate (Tr), and stomatal conductance (Gs) of covered and naked oat leaves were inhibited, instead, the intercellular CO2 concentration (Ci) and water use efficiency (WUE) were increased under the herbicides stress during the early growth stages such as tillering stage and elongation stage. The change range increased by herbicide concentration, at the highest concentrations of two herbicides, the Pn average values of covered oat and naked oat in early stages were decreased by 42.86% and 50.65% than that of control respectively. Three independent comprehensive components were obtained from 13 single production indexes and photosynthetic indexes of oats by principal component analysis. The Tr, SPAD, Pn of top second leaf and 1000-kernel weight of seed were reference indexes for the prediction of efficient and safe of herbicides. In summary, FLF with concentration of 180 mL·hm-2 was proposed as the suitable practices for the target area. |
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