Abstract
Growth and N uptake in pot-grown maize, beans, and cassava were evaluated under 2 levels of soil N at CIAT-Palmira (Colombia). The lower amount of the element reduced its uptake by the 3 species, resulting in lower tissue concn., especially in the leaves. Under low N, DM accumulation was also reduced 5 wk. after planting for maize and beans, and 7 wk. after planting for cassava. Higher amounts of N in the soil increased leaf expansion and photosynthesis (Pn) in maize and beans 3 and 4 wk. after planting, resp., and in cassava after 7 wk. Cassava plants tended to increase N-use efficiency, slightly but nonsignificantly, under low N. Maize used N more efficiently; however, the existence of a real difference between crops cannot be affirmed due to the reduced soil N concn. (AS)
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Claims 10
Claim · model-written summary
Lower soil nitrogen reduced nitrogen uptake in maize, beans, and cassava.
- Taxon
- maize, beans, and cassavae1
- Treatment
- lower amount of the elemente0
- Outcome
- uptakee0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“The lower amount of the element reduced its uptake by the 3 species”
e1“maize, beans, and cassava”
Claim · model-written summary
Lower nitrogen resulted in lower tissue concentrations, especially in leaves, in the three species.
- Taxon
- maize, beans, and cassavae1
- Organ / stage
- leavese0
- Treatment
- soil Ne2
- Outcome
- tissue concn.e0
- Direction
- lowere0
Not reportedComparator
Verbatim
e0“resulting in lower tissue concn., especially in the leaves”
e1“maize, beans, and cassava”
e2“2 levels of soil N”
Claim · model-written summary
Low nitrogen reduced dry matter accumulation in maize five weeks after planting.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low N, DM accumulation was also reduced 5 wk. after planting for maize and beans”
Claim · model-written summary
Low nitrogen reduced dry matter accumulation in beans five weeks after planting.
- Taxon
- beanse0
- Treatment
- low Ne0
- Outcome
- DM accumulatione0
- Direction
- reducede0
- Qualifier
- 5 wk. after plantinge0
Not reportedComparator
Verbatim
e0“Under low N, DM accumulation was also reduced 5 wk. after planting for maize and beans”
Claim · model-written summary
Low nitrogen reduced dry matter accumulation in cassava seven weeks after planting.
- Taxon
- cassava
Manihot esculentae0 - Treatment
- low Ne0
- Outcome
- DM accumulatione0
- Direction
- reducede0
- Qualifier
- 7 wk. after plantinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low N, DM accumulation was also reduced 5 wk. after planting for maize and beans, and 7 wk. after planting for cassava”
Claim · model-written summary
Higher soil nitrogen increased maize leaf expansion and photosynthesis three weeks after planting.
- Treatment
- Higher amounts of N in the soile0
- Outcome
- leaf expansion and photosynthesis (Pn)e0
- Direction
- increasede0
- Qualifier
- 3 and 4 wk. after planting, resp.e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher amounts of N in the soil increased leaf expansion and photosynthesis (Pn) in maize and beans 3 and 4 wk. after planting, resp.”
Claim · model-written summary
Higher soil nitrogen increased bean leaf expansion and photosynthesis four weeks after planting.
- Taxon
- beanse0
- Treatment
- Higher amounts of N in the soile0
- Outcome
- leaf expansion and photosynthesis (Pn)e0
- Direction
- increasede0
- Qualifier
- 3 and 4 wk. after planting, resp.e0
Not reportedComparator
Verbatim
e0“Higher amounts of N in the soil increased leaf expansion and photosynthesis (Pn) in maize and beans 3 and 4 wk. after planting, resp.”
Claim · model-written summary
Higher soil nitrogen increased cassava leaf expansion and photosynthesis after seven weeks.
- Taxon
- cassavaManihot esculentae0
- Treatment
- Higher amounts of N in the soile0
- Outcome
- leaf expansion and photosynthesis (Pn)e0
- Direction
- increasede0
- Qualifier
- after 7 wk.e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher amounts of N in the soil increased leaf expansion and photosynthesis (Pn) in maize and beans 3 and 4 wk. after planting, resp., and in cassava after 7 wk.”
Claim · model-written summary
Cassava tended to have slightly higher nitrogen use efficiency under low nitrogen, without significance.
- Taxon
- CassavaManihot esculentae0
- Treatment
- low Ne0
- Outcome
- N-use efficiencye0
- Direction
- increasee0
- Qualifier
- slightly but nonsignificantlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava plants tended to increase N-use efficiency, slightly but nonsignificantly, under low N”
Claim · model-written summary
Maize used nitrogen more efficiently, though a crop difference could not be affirmed.
- Outcome
- used N more efficientlye0
- Direction
- more efficientlye0
- Qualifier
- the existence of a real difference between crops cannot be affirmede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize used N more efficiently; however, the existence of a real difference between crops cannot be affirmed”
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See all 142 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.