Abstract
Soil properties, plant characteristics, agronomic practices and environmental factors often influence biological nitrogen fixation of legumes. Tillage method used in a specific agro-ecological zone is among these factors thus, the aim of this study was to determine the effect of tillage and no tillage on biological nitrogen fixation and grain yields of three soybean varieties. The study was conducted at four agro-ecological zones of Western Kenya where treatments were replicated thrice using randomized complete block design in split plot arrangement. No tillage and conventional tillage were the main plots whereas, soybean varieties: Nyala, SB19 and SB20 were the sub-plots. Amount of N fixed was determined using 15N abundance method and quantity of nitrogen fixed under no tillage practice exceeded conventional tillage at all sites however, soybean varieties fixed same amount of N. Interaction effect of tillage method and variety on amount of N fixed was varying at every agro-ecological zone though, interaction between no tillage and Nyala fixed more nitrogen at LM 3 than at other agro-ecological zones. Soybean grain yield was similar between tillage methods and also among varieties in a combination of all sites. Practicing no tillage encourages biological nitrogen fixation and its longtime operation leads to yield increase as it improves most soil properties.
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Claims 8
Claim · model-written summary
No tillage increased soybean nitrogen fixation relative to conventional tillage at all sites.
- Taxon
- soybean
Glycine maxt0 - Treatment
- no tillage practicee0
- Outcome
- quantity of nitrogen fixede0
- Direction
- exceedede0
- Comparator
- conventional tillagee0
- Setting
- all sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“quantity of nitrogen fixed under no tillage practice exceeded conventional tillage at all sites”
t0“soybean”
Claim · model-written summary
Soybean varieties fixed the same amount of nitrogen.
- Taxon
- soybeanGlycine maxe0
- Outcome
- amount of Ne0
- Direction
- samee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean varieties fixed same amount of N”
Claim · model-written summary
The tillage by variety effect on nitrogen fixation varied among agro-ecological zones.
- Taxon
- soybeanGlycine maxt0
- Treatment
- tillage methode0
- Outcome
- amount of N fixede0
- Direction
- varyinge0
- Setting
- every agro-ecological zonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interaction effect of tillage method and variety on amount of N fixed was varying at every agro-ecological zone”
t0“soybean”
Claim · model-written summary
No tillage with Nyala fixed more nitrogen at LM 3 than at other zones.
- Taxon
- soybeanGlycine maxt0
- Material
- Nyalae0
- Treatment
- no tillagee0
- Outcome
- nitrogene0
- Direction
- moree0
- Comparator
- other agro-ecological zonese0
- Setting
- LM 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“interaction between no tillage and Nyala fixed more nitrogen at LM 3 than at other agro-ecological zones”
t0“soybean”
Claim · model-written summary
Soybean grain yield was similar between tillage methods.
- Taxon
- SoybeanGlycine maxe0
- Treatment
- tillage methodse0
- Outcome
- grain yielde0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean grain yield was similar between tillage methods”
Claim · model-written summary
Soybean grain yield was similar among varieties across sites.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- grain yielde0
- Direction
- similare0
- Setting
- all sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain yield was similar between tillage methods and also among varieties in a combination of all sites”
t0“Soybean”
Claim · model-written summary
The authors conclude that no tillage encourages biological nitrogen fixation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- no tillagee0
- Outcome
- biological nitrogen fixatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Practicing no tillage encourages biological nitrogen fixation”
t0“soybean”
Claim · model-written summary
The authors conclude that long term no tillage increases yield by improving soil properties.
- Taxon
- soybeanGlycine maxt0
- Outcome
- yield increasee0
- Qualifier
- improves most soil propertiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its longtime operation leads to yield increase as it improves most soil properties”
t0“soybean”
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See all 390 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.