Abstract
Two trials were performed in Balcarce, Argentina (37° 45' LS; 58° 18' LW) during 1993-94, to assess the effect of eight herbicides applied individually or in tank mixtures, on nodule number, nodule dry weight, seed yield and N percent in seed in soybean Asgrow 3205, inoculated with Bradyrhizobium japonicum CB 1809. Individual herbicides and doses in kg ha-1 of a.i. were metribuzin (0.48), acetochlor (0.90), metolachlor (1), flumioxazin (0.075), trifluralin (0.96), imazaquin (0.20), imazethapyr (0.10) and chlorimuron ethyl (0.0125). The mixtures were metribuzin+acetochlor (0.48+0.9), flumioxazin+acetochlor (0.075+0.9), imazaquin+acetochlor (0.2+0.9), metribuzin+metolachlor (0.48+1.92), and flumioxazin+ metolachlor (0.075+1.92). A control treatment without herbicides was included. Both trials were laid out as randomized complete blocks with four replicates, on a loam illitic thermic petrocalcic Paleudoll, 5.7% organic matter (OM), 25% clay, 30.4 cmol kg-1 CEC. Nodules were sampled at V2 (second node), V6 (sixth node) and R5 (beginning seed) growth stages. Herbicides did not significantly affect the beginning of nodulation or nodule number and mass at R5, not either grain yield or N accumulation. This indicates lack of interference between soil interacting herbicides and N fixation in the high organic matter, loam soils of SE Buenos Aires province, even though a tendency in less number and dry weight of nodules was evident at the two latter growth stages.
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Claims 4
Claim · model-written summary
Herbicides did not significantly affect onset of nodulation.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Herbicidese0
- Interactor
- Bradyrhizobium japonicum CB 1809
Bradyrhizobium japonicume2symbiont - Outcome
- beginning of nodulatione0
- Direction
- did not significantly affecte0
- Comparator
- A control treatment without herbicidese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbicides did not significantly affect the beginning of nodulation”
e1“A control treatment without herbicides was included”
e2“Bradyrhizobium japonicum CB 1809”
t0“soybean”
Claim · model-written summary
Herbicides did not significantly affect nodule number or mass at R5.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- R5e0
- Treatment
- Herbicidese0
- Outcome
- nodule number and masse0
- Direction
- did not significantly affecte0
- Comparator
- A control treatment without herbicidese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbicides did not significantly affect the beginning of nodulation or nodule number and mass at R5”
e1“A control treatment without herbicides was included”
t0“soybean”
Claim · model-written summary
Herbicides did not significantly affect grain yield or nitrogen accumulation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Herbicidese0
- Outcome
- grain yield or N accumulatione0
- Direction
- not eithere0
- Comparator
- A control treatment without herbicidese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Herbicides did not significantly affect the beginning of nodulation or nodule number and mass at R5, not either grain yield or N accumulation”
e1“A control treatment without herbicides was included”
t0“soybean”
Claim · model-written summary
Nodule number and dry weight tended lower at the two latter growth stages.
- Taxon
- soybeanGlycine maxt0
- Outcome
- number and dry weight of nodulese0
- Direction
- lesse0
- Qualifier
- two latter growth stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a tendency in less number and dry weight of nodules was evident at the two latter growth stages”
t0“soybean”
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3 papers in the same direction as this paper
- no effect
- negative
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.