Abstract
Although numerous studies have been conducted with common bean regarding nitrogen (N) dose, time of application, and source in no-till (NT) soils in Brazil, the heterogeneity of the results makes it difficult to establish technical recommendations based on individualized studies. This meta-analysis aimed to rank the main factors influencing common bean response to N management in NT areas. The database consisted of 99 scientific papers that encompassed 160 trials and 2394 observations. In general, the probability of obtaining a positive response to N application in common bean productivity was 77 %, with an average 18 % increment (358 kg ha -1 ). The main factors that affect the response of common bean grain yield to N fertilization and the choice of the applied N dose are soil organic matter (OM) content and the preceding crop. In soils with OM content >20 g kg -1 , the N dose that determines the highest economic return is 50 kg ha -1 . For soils with OM content <20 g kg -1 , the N dose to be applied is 70 and 100 kg ha -1 for crops preceded by legumes and grasses, respectively. The timing of the N application did not result in a significant difference in common bean yield in 62 % of the trials. However, the results showed that the average yield increase in the common bean went from 15 % (293 kg ha -1 ) with a single application to 32 % (622 kg ha -1 ) with split N applications. All N sources tested showed similar gains to those obtained with N application through urea. Excluding situations with high doses of N application (>100 kg ha -1 ), inoculating common bean seeds increased grain yields by 6 % on average (118 kg ha -1 ). The combined analysis of the available results demonstrated that the crop recommendations used in Brazilian soils under NT could be refined considering the soil OM concentration and preceding crop. Additionally, seed inoculation and N dose splitting in the form of common urea should be recommended.
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Claims 11
Claim · model-written summary
Common bean productivity responded positively to N application in 77 % of observations, with an average 18 % gain.
- Taxon
- Common bean
Phaseolus vulgarist0 - Treatment
- N applicatione0
- Outcome
- common bean productivitye0
- Direction
- positive responsee0
- Value
- 77 %e0
- Qualifier
- 18 % increment (358 kg ha -1 )e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the probability of obtaining a positive response to N application in common bean productivity was 77 %, with an average 18 % increment (358 kg ha -1 )”
t0“Common bean”
Claim · model-written summary
Soil organic matter content and preceding crop were the main factors affecting common bean grain yield response and N dose choice.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- N fertilizatione0
- Outcome
- grain yielde0
- Qualifier
- soil organic matter (OM) content and the preceding crope0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The main factors that affect the response of common bean grain yield to N fertilization and the choice of the applied N dose are soil organic matter (OM) content and the preceding crop”
t0“Common bean”
Claim · model-written summary
For soil OM above 20 g kg -1, 50 kg ha -1 N provided the highest economic return.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- 50 kg ha -1e0
- Outcome
- highest economic returne0
- Qualifier
- OM content >20 g kg -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In soils with OM content >20 g kg -1 , the N dose that determines the highest economic return is 50 kg ha -1”
t0“Common bean”
Claim · model-written summary
For soil OM below 20 g kg -1 after legumes, the recommended N dose was 70 kg ha -1.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- 70e0
- Outcome
- N dose to be appliede0
- Qualifier
- OM content <20 g kg -1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For soils with OM content <20 g kg -1 , the N dose to be applied is 70 and 100 kg ha -1 for crops preceded by legumes and grasses, respectively”
t0“Common bean”
Claim · model-written summary
For soil OM below 20 g kg -1 after grasses, the recommended N dose was 100 kg ha -1.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- 100 kg ha -1e0
- Outcome
- N dose to be appliede0
- Qualifier
- grassese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For soils with OM content <20 g kg -1 , the N dose to be applied is 70 and 100 kg ha -1 for crops preceded by legumes and grasses, respectively”
t0“Common bean”
Claim · model-written summary
Nitrogen application timing did not significantly alter common bean yield in 62 % of trials.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- timing of the N applicatione0
- Outcome
- common bean yielde0
- Direction
- did not result in a significant differencee0
- Value
- 62 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The timing of the N application did not result in a significant difference in common bean yield in 62 % of the trials”
t0“Common bean”
Claim · model-written summary
Single N application increased common bean yield by 15 % or 293 kg ha -1.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- single applicatione0
- Outcome
- yielde0
- Direction
- increasee0
- Value
- 15 % (293 kg ha -1 )e0
- Comparator
- split N applicationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average yield increase in the common bean went from 15 % (293 kg ha -1 ) with a single application to 32 % (622 kg ha -1 ) with split N applications”
t0“Common bean”
Claim · model-written summary
Split N applications increased common bean yield by 32 % or 622 kg ha -1.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- split N applicationse0
- Outcome
- yielde0
- Direction
- increasee0
- Value
- 32 % (622 kg ha -1 )e0
- Comparator
- single applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the average yield increase in the common bean went from 15 % (293 kg ha -1 ) with a single application to 32 % (622 kg ha -1 ) with split N applications”
t0“Common bean”
Claim · model-written summary
All tested N sources gave gains similar to urea in common bean.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- N sources testede0
- Outcome
- gainse0
- Direction
- similare0
- Comparator
- ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“All N sources tested showed similar gains to those obtained with N application through urea”
t0“Common bean”
Claim · model-written summary
Seed inoculation increased common bean grain yield by 6 % on average outside high N dose situations.
- Taxon
- Common beanPhaseolus vulgarist0
- Treatment
- inoculating common bean seedse0
- Outcome
- grain yieldse0
- Direction
- increasede0
- Value
- 6 %e0
- Qualifier
- >100 kg ha -1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excluding situations with high doses of N application (>100 kg ha -1 ), inoculating common bean seeds increased grain yields by 6 % on average (118 kg ha -1 )”
t0“Common bean”
Claim · model-written summary
The authors recommend seed inoculation and split common urea N doses.
- Taxon
- Common beanPhaseolus vulgarist0
- Outcome
- seed inoculation and N dose splitting in the form of common ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seed inoculation and N dose splitting in the form of common urea should be recommended”
t0“Common bean”
The same questions in other papers
inoculation · yield · Phaseolus vulgaris (common bean)Positive and negative results
152 papers in the same direction as this paper · 36 in the opposite direction · 6 reporting no difference from an alternative
- positive
- negative
- no effect
191 papers more in this group
See all 195 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.