Abstract
SUMMARY The potential benefit to be derived from seed inoculation of Phaseolus vulgaris beans with effective strains of Rhizobium phaseoli , was investigated in field experiments over three years on a site low in soil nitrogen and lacking indigenous effective strains of R. phaseoli. Inoculation with R. phaseoli (strain RCR 3644) produced significant increases in nodulation, nitrogenase activity and plant growth in all experiments. In trials in 1978 and 1979, with cv. Seafarer, inoculation, in the absence of nitrogen fertiliser doubled seed yields. In 1978, the seed yields from inoculated beans without nitrogen fertiliser (1–6 t/ha) were not significantly different from those obtained with uninoculated beans receiving the optimum nitrogen fertiliser treatment of 120 kg N/ha (1–75 t/ha). In 1979, with lower rainfall favouring more efficient utilisation of nitrogen fertiliser, inoculation gave seed yields (1–88 t/ha) equivalent to those obtained with 60 kg N/ha (1–70 t/ha) but significantly less than with 120 kg N/ha (2–88 t/ha). More precise estimates from nitrogen response curves showed that inoculation supplied the fertiliser equivalent of 105 and 70 kg N/ha in 1978 and 1979 respectively. In both years, significant benefits were also obtained by the combination of inoculation and nitrogen fertiliser. In a separate experiment in 1979, with four R. phaseoli strains inoculated onto eight bean cultivars, three were highly effective nitrogen fixers on all cultivars. Two strains (RCR 3644 and NVRS 963A) each increased mean yields, in the absence of nitrogen fertiliser, from 1–39 t/ha uninoculated to c. 2–5 t/ha inoculated whilst strain RCR 3622 was outstanding with a mean yield of 3‐0 t/ha. An analysis of the nitrogen content of seed showed that gains from nitrogen fixation were 37–57 kg N/ha/growing cycle for the combination RCR 3644 with cv. Seafarer. However, 106 kg N/ha/growing cycle was recorded for the combination RCR 3622 and cv. Aurora.
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Claims 13
Claim · model-written summary
RCR 3644 inoculation significantly increased nodulation, nitrogenase activity, and growth.
- Treatment
- Inoculation with R. phaseoli (strain RCR 3644)e0
- Interactor
- R. phaseoliRhizobium phaseolie0symbiont
- Outcome
- nodulation, nitrogenase activity and plant growthe0
- Direction
- increasese0
Not reportedTaxonComparator
Verbatim
e0“Inoculation with R. phaseoli (strain RCR 3644) produced significant increases in nodulation, nitrogenase activity and plant growth in all experiments”
Claim · model-written summary
Inoculation doubled Seafarer seed yields without fertilizer in 1978 and 1979.
Not reportedTaxonComparator
Verbatim
e0“with cv. Seafarer, inoculation, in the absence of nitrogen fertiliser doubled seed yields”
Claim · model-written summary
In 1978 inoculated beans without fertilizer yielded 1–6 t/ha, statistically similar to uninoculated beans at 120 kg N/ha yielding 1–75 t/ha.
Verbatim
e0“seed yields from inoculated beans without nitrogen fertiliser (1–6 t/ha) were not significantly different from those obtained with uninoculated beans receiving the optimum nitrogen fertiliser treatment of 120 kg N/ha (1–75 t/ha)”
Claim · model-written summary
In 1979 inoculation yielded 1–88 t/ha, equivalent to 60 kg N/ha yielding 1–70 t/ha.
- Treatment
- inoculatione0
- Outcome
- seed yieldse0
- Direction
- equivalente0
- Value
- 1–88 t/hae0
- Comparator
- 60 kg N/hae0
Not reportedTaxon
Verbatim
e0“inoculation gave seed yields (1–88 t/ha) equivalent to those obtained with 60 kg N/ha (1–70 t/ha)”
Claim · model-written summary
In 1979 inoculation yielded less than 120 kg N/ha treatment.
Not reportedTaxonTreatment
Verbatim
e0“but significantly less than with 120 kg N/ha (2–88 t/ha)”
Claim · model-written summary
Inoculation supplied fertilizer equivalents of 105 and 70 kg N/ha in 1978 and 1979.
Not reportedTaxon
Verbatim
e0“inoculation supplied the fertiliser equivalent of 105 and 70 kg N/ha in 1978 and 1979 respectively”
Claim · model-written summary
Combining inoculation and nitrogen fertilizer gave significant benefits in both years.
Not reportedTaxonComparatorDirection
Verbatim
e0“significant benefits were also obtained by the combination of inoculation and nitrogen fertiliser”
Claim · model-written summary
Three of four strains were highly effective nitrogen fixers across all cultivars.
Not reportedTaxon
Verbatim
e0“three were highly effective nitrogen fixers on all cultivars”
Claim · model-written summary
RCR 3644 increased mean yield from 1–39 to about 2–5 t/ha.
- Treatment
- RCR 3644e0
- Outcome
- mean yieldse0
- Direction
- increasede0
- Value
- c. 2–5 t/hae0
- Comparator
- uninoculatede0
Not reportedTaxon
Verbatim
e0“Two strains (RCR 3644 and NVRS 963A) each increased mean yields, in the absence of nitrogen fertiliser, from 1–39 t/ha uninoculated to c. 2–5 t/ha inoculated”
Claim · model-written summary
NVRS 963A increased mean yield from 1–39 to about 2–5 t/ha.
- Treatment
- NVRS 963Ae0
- Outcome
- mean yieldse0
- Direction
- increasede0
- Value
- c. 2–5 t/hae0
- Comparator
- uninoculatede0
Not reportedTaxon
Verbatim
e0“Two strains (RCR 3644 and NVRS 963A) each increased mean yields, in the absence of nitrogen fertiliser, from 1–39 t/ha uninoculated to c. 2–5 t/ha inoculated”
Claim · model-written summary
RCR 3622 produced an outstanding mean yield of 3‐0 t/ha.
Not reportedTaxon
Verbatim
e0“strain RCR 3622 was outstanding with a mean yield of 3‐0 t/ha”
Claim · model-written summary
Nitrogen fixation gains for RCR 3644 with Seafarer were 37–57 kg N/ha/growing cycle.
Not reportedTaxon
Verbatim
e0“gains from nitrogen fixation were 37–57 kg N/ha/growing cycle for the combination RCR 3644 with cv. Seafarer”
Claim · model-written summary
Nitrogen fixation gains for RCR 3622 with Aurora were 106 kg N/ha/growing cycle.
Not reportedTaxon
Verbatim
e0“106 kg N/ha/growing cycle was recorded for the combination RCR 3622 and cv. Aurora”
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See all 376 papers →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.