Abstract
Abstract Investigations were conducted to determine the influence of selected pesticides on the growth of Rhizobium japonicum Kirch. Buch. in pure culture and in soil. In addition, nodulation and seed yield of inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’] were studied under field conditions. Commercial formulations of 24 pesticides were screened for bacteriostatic activity on rhizobia using a gradient plate technique. Isopropyl m‐chlorocarbanilate (chlorpropham) and o,o‐diethyl‐s‐[2‐(ethylthio)‐ethyl] phosphorodithioate (disulfoton) were the only pesticides that inhibited growth. In addition to these pesticides, 4‐(methylsulfonyl)‐2,6‐dinitro‐N, N‐dipropylaniline (nitralin) and 1‐napthyl N‐methylcarbamate (carbaryl) were selected for further study to substantiate the laboratory results. Six U. S. Department of Agriculture rhizobia strains were cultured in pesticide‐amended medium 79 and subsequent growth was determined turbidimetrically. Nitralin exhibited little effect on the rhizobia, whereas chlorprophram, disulfoton, and carbaryl evoked a differential strain response. Most probable number determinations of pesticidetreated soil samples indicated that naturalized soil populations of R. japonicum remained unaltered four weeks after pesticide application. Recommended rates of the pesticides studied did not influence soybean nodulation or seed yield.
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Claims 6
Claim · model-written summary
Chlorpropham inhibited rhizobial growth in a gradient plate screen.
- Taxon
- soybeans
Glycine maxe1 - Treatment
- chlorprophame0
- Outcome
- growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isopropyl m‐chlorocarbanilate (chlorpropham) and o,o‐diethyl‐s‐[2‐(ethylthio)‐ethyl] phosphorodithioate (disulfoton) were the only pesticides that inhibited growth”
e1“inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’]”
Claim · model-written summary
Disulfoton inhibited rhizobial growth in a gradient plate screen.
- Taxon
- soybeansGlycine maxe1
- Treatment
- disulfotone0
- Outcome
- growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Isopropyl m‐chlorocarbanilate (chlorpropham) and o,o‐diethyl‐s‐[2‐(ethylthio)‐ethyl] phosphorodithioate (disulfoton) were the only pesticides that inhibited growth”
e1“inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’]”
Claim · model-written summary
Nitralin had little effect on rhizobial growth.
- Taxon
- soybeansGlycine maxe1
- Treatment
- Nitraline0
- Outcome
- rhizobiae0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitralin exhibited little effect on the rhizobia”
e1“inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’]”
Claim · model-written summary
Chlorprophram, disulfoton and carbaryl elicited differential rhizobial strain responses.
- Taxon
- soybeansGlycine maxe1
- Outcome
- differential strain responsee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorprophram, disulfoton, and carbaryl evoked a differential strain response”
e1“inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’]”
Claim · model-written summary
Naturalized R. japonicum soil populations remained unaltered four weeks after pesticide application.
- Taxon
- soybeansGlycine maxe1
- Treatment
- pesticide applicatione0
- Interactor
- R. japonicume0symbiont
- Outcome
- naturalized soil populations of R. japonicume0
- Direction
- remained unalterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“naturalized soil populations of R. japonicum remained unaltered four weeks after pesticide application”
e1“inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’]”
Claim · model-written summary
Recommended pesticide rates did not influence soybean nodulation or seed yield.
- Taxon
- soybeansGlycine maxe1
- Treatment
- Recommended rates of the pesticides studiede0
- Outcome
- soybean nodulation or seed yielde0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Recommended rates of the pesticides studied did not influence soybean nodulation or seed yield”
e1“inoculated soybeans [ Glycine max (L.) Merr. cultivar ‘Wayne’]”
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