Search claims · PlantClaims

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

The authors concluded that stomatal behaviour cannot explain water use efficiency differences between nitrogen levels.

Taxon: maize and sunflowerHelianthus annuus Zea mayst0
Compound: Ne0
Outcome: differences in water-use efficiencye0
Qualifier: stomatal behaviour cannot explaine0

Verbatim

e0
“stomatal behaviour cannot explain differences in water-use efficiency between plants growing at different levels of N”
✓ located verbatim in the source · abstract, characters 415–532

t0
“maize and sunflower”
✓ located verbatim in the source · title, characters 92–111

Title

The direct and indirect effects of nitrogen shortage on photosynthesis and transpiration in maize and sunflower.

J. Goudriaan; H. van Keulen Netherlands Journal of Agricultural Science 1979. doi:10.18174/njas.v27i3.17055

Other claims from this paper (2)

Mechanismauthor interpretationoriginal resultpositivemeasured

Claim · model-written summary

Fumigation improved root health and nitrogen use efficiency.

Taxon: sugar beetBeta vulgaris subsp. vulgarist0
Treatment: Fumigatione0
Outcome: health of rootse0

Verbatim

e0
“Fumigation not only improved the health of roots, and so enabled them to use nitrogen more efficiently”
✓ located verbatim in the source · abstract, characters 1125–1227

t0
“sugar beet”
✓ located verbatim in the source · title, characters 73–83

Title

The effects of soil fumigation and nitrogen fertilizers on nematodes and sugar beet in sandy soils

D. A. COOKE; A. P. DRAYCOTT Annals of Applied Biology 1971. doi:10.1111/j.1744-7348.1971.tb04678.x

Other claims from this paper (16)

Intervention effect D-D fumigation raised sugar beet root yield from 25 to 36 t/ha.
Intervention effect Applying 85 kg N/ha increased yield on fumigated plots by 7 t/ha.
Intervention effect Additional nitrogen beyond 85 kg N/ha gave little yield benefit.
Intervention effect Fumigation killed 65 % of Pratylenchus in the top 5 cm.
Intervention effect Fumigation killed 80% of Trichodorus in the top 5 cm.
Intervention effect Fumigation killed 90% of Tylenchorhynchus in the top 5 cm.
Intervention effect Fumigation killed 90% of Pratylenchus at 15–20 cm depth.
Intervention effect Fumigation killed 93% of Trichodorus at 15–20 cm depth.
Intervention effect Fumigation killed 95% of Tylenchorhynchus at 15–20 cm depth.
Association Yield gains from fumigation did not correlate with initial nematode populations.
Association Yield gains from fumigation correlated poorly with May rainfall.
Association Nematode population increases from April to August correlated positively with preceding ten week rainfall.
Association Nematode population increases correlated positively with rainfall in the previous week.
Intervention effect Fumigation increased soil available nitrogen.
Intervention effect Fumigation decreased nitrogen loss by leaching.
Intervention effect Injected anhydrous ammonia did not affect nematode populations.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

Differences in nitrogen transport and assimilation appear related to plant composition and nitrogen use efficiency.

Taxon: CucumberCucumis sativust0
Outcome: plant composition and efficiency of N usagee0
Qualifier: differences in N transport and assimilatione0

Verbatim

e0
“differences in N transport and assimilation appear to bear considerably on plant composition and efficiency of N usage”
✓ located verbatim in the source · abstract, characters 926–1044

t0
“Cucumber”
✓ located verbatim in the source · title, characters 72–80

Title

A Physiological Basis for Different Patterns of Nitrate Accumulation in Cucumber and Pea1

Frederick C. Olday; Allen V. Barker; Donald N. Maynard Journal of the American Society for Horticultural Science 1976. doi:10.21273/jashs.101.3.219

Other claims from this paper (12)

Observation Cucumber accumulated more than pea.
Observation Only 2% of cucumber reductase activity was in roots.
Observation Nearly 92% of cucumber reductase activity was in blades.
Observation Pea reductase activity was more evenly distributed.
Observation Pea blades contained 67% of reductase activity.
Observation Pea roots contained 18% of reductase activity.
Observation Cucumber root bleeding sap contained 80% nitrate nitrogen.
Observation Pea root sap contained 30% nitrate nitrogen.
Observation The remaining 70% of pea root sap nitrogen consisted of amino acids and amides.
Observation Asparagine or aspartic acid was the major reduced nitrogen carrier in pea.
Observation Glutamine was the major reduced nitrogen carrier in cucumber.
Mechanism Differences in root reduction appear to explain nitrate accumulation differences.

Mechanismhypothesisoriginal resultmeasured

Claim · model-written summary

The authors proposed that cell division of labor partly explains greater nitrogen use efficiency in crabgrass and other C4 plants.

Taxon: crabgrasse0
Outcome: increased nitrogen use efficiencye0
Qualifier: "division of labor" between mesophyll and bundle sheath cellse0

Verbatim

e0
“increased nitrogen use efficiency in crabgrass and other C(4) plants is due partially to a "division of labor" between mesophyll and bundle sheath cells”
✓ located verbatim in the source · abstract, characters 1367–1519

Title

Nitrogen Assimilation Pathways in Leaf Mesophyll and Bundle Sheath Cells of C₄ Photosynthesis Plants Formulated from Comparative Studies with Digitaria sanguinalis (L.) Scop.

Randy Moore; Clanton C. Black PLANT PHYSIOLOGY 1979. doi:10.1104/pp.64.2.309

Other claims from this paper (13)

Mechanismauthor interpretationoriginal resultpositivemeasured

Claim · model-written summary

Shatabdi was the best performer under bed planting, attributed to its maximum nitrogen and protein content in grain and straw, maximum N use efficiency and fertilizer recovery percentage.

Taxon: WheatTriticum aestivume0
Material: Shatabdie1
Treatment: bed planting systeme1
Outcome: best performere1
Qualifier: maximum nitrogen and protein content in grain and strawe1

Verbatim

e0
“Wheat (Triticum aestivum L.) was planted as winter crop”
✓ located verbatim in the source · abstract, characters 0–55

e1
“Shatabdi was the best performer in bed planting system due to maximum nitrogen and protein content in grain and straw, maximum N use efficiency and fertilizer recovery percentage”
✓ located verbatim in the source · abstract, characters 1283–1461

Title

Yield and N use efficiency of wheat as influenced by bed planting and N application

MA Khaleque; NK Paul; Craig A Meisner Bangladesh Journal of Agricultural Research 1970. doi:10.3329/bjar.v33i3.1603

Other claims from this paper (10)

Intervention effect Bed elevation gave maximum total N uptake by wheat compared with the conventional planting system.
Intervention effect The zero N treatment gave the highest N use efficiency in wheat compared with the applied N levels.
Association Variety Shatabdi had the highest N use efficiency among the wheat varieties tested.
Association Shatabdi under bed planting had the maximum fertilizer recovery percentage.
Association Bed planting gave the highest wheat grain yield of 2,555 kg/ha.
Association Shatabdi gave the highest wheat grain yield of 2,929 kg/ha, a significant difference.
Association The 150% N application gave the highest wheat grain yield of 3,746 kg/ha.
Association Under bed planting, 150% N gave the highest wheat grain yield of 3,323 kg/ha.
Association The zero N treatment gave the lowest wheat grain yield of 1,177 kg/ha.
Association The highest N content in grain and straw was obtained from bed planting with Shatabdi at 150% N.

Mechanismhypothesisoriginal resultbasis n/a

Claim · model-written summary

The proposed efficiency difference is attributed to smaller nitrogen investment in C4 carboxylation enzymes.

Taxon: C 4 plantse0
Gene: photosynthetic carboxylation enzymese0
Outcome: relatively smaller investment of N in the photosynthetic carboxylation enzymese0

Verbatim

e0
“This difference presumably results from the relatively smaller investment of N in the photosynthetic carboxylation enzymes of C 4 plants than of C 3 plants.”
✓ located verbatim in the source · abstract, characters 659–815

Title

A Difference in N Use Efficiency in C₃ and C₄ Plants and its Implications in Adaptation and Evolution¹

R. H. Brown Crop Science 1978. doi:10.2135/cropsci1978.0011183x001800010025x

Other claims from this paper (3)

Observation C4 species have higher CO2 uptake than C3 species.
Observation C4 species produce more dry matter per unit water transpired.
Association The paper hypothesizes greater nitrogen use efficiency in C4 than C3 plants.

Mechanismauthor interpretationoriginal resultbasis n/a

Claim · model-written summary

N influenced protein only through its effect on grain yield.

Taxon: WHEATTriticum aestivumt0
Treatment: Ne0
Outcome: proteine0
Qualifier: via its effect on grain yielde0

Verbatim

t0
“OF MANITOU SPRING WHEAT”
✓ located verbatim in the source · title, characters 138–161

e0
“N influenced protein only via its effect on grain yield”
✓ located verbatim in the source · abstract, characters 1622–1677

Title

EFFECT OF TEMPERATURE, NITROGEN FERTILIZATION AND MOISTURE STRESS ON YIELD, YIELD COMPONENTS, PROTEIN CONTENT AND MOISTURE USE EFFICIENCY OF MANITOU SPRING WHEAT

C. A. CAMPBELL; H. R. DAVIDSON Canadian Journal of Plant Science 1979. doi:10.4141/cjps79-153

Other claims from this paper (14)

Association Grain yield of wheat was directly related to N.
Association Yield was positively related to the number of spikes (r = 0.71**).
Association Yield was positively related to the number of seeds per spike (r = 0.65**).
Association Yield was negatively related to average seed weight (r = −0.41**).
Association Seed weight was negatively related to the number of spikes.
Association The number of spikes at maturity was increased by N.
Association Number of spikelets per spike, seed set and seed weight were negatively related to temperature.
Association Grain protein of wheat was directly related to temperature.
Intervention effect Nitrogen increased protein at day/night temperatures of T22/12 °C.
Intervention effect Nitrogen did not change protein at T27/12 °C.
Intervention effect High moisture stress applied between last leaf visible and anthesis increased grain protein.
Association Grain protein was inversely related to grain yield at any given level of N.
Association Moisture use efficiency was improved by factors that increased grain yield.
Intervention effect Moisture stress between last leaf visible and anthesis deleteriously affected moisture use efficiency.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

High available soil N partly explains both high apparent N recovery and high DM response

Taxon: perennial ryegrassLolium perennee0
Outcome: high apparent recovery of N and high DM responsee1
Qualifier: available soil Ne1

Verbatim

e0
“from primary growth and two successive regrowths of perennial ryegrass”
✓ located verbatim in the source · abstract, characters 50–120

e1
“High available soil N is partly responsible for both high apparent recovery of N and high DM response”
✓ located verbatim in the source · abstract, characters 865–966

Title

INTERACTIONS BETWEEN FIRST AND SECOND APPLICATIONS OF FERTILIZER NITROGEN AND IMPLICATIONS IN EFFICIENCY OF NITROGEN USE

I. V. Hunt; J. Frame; R. D. Harkess W Grass and Forage Science 1975. doi:10.1111/j.1365-2494.1975.tb01372.x

Other claims from this paper (9)

Observation Primary growth gave a response of 24·2 kg DM/kg applied N to PN50
Observation Only a further l±0 kg DM/kg applied N came from the second PN increment (value garbled in source)
Observation A significant interaction between PN and SN treatments was shown in second growth
Observation The residual DM response to PN was highest at SN0
Association The residual DM response to PN reduced as the SN level was raised
Intervention effect Substantially greater residual responses to PN treatments were shown in the third growth
Observation Third growth DM responses to SN treatments were high
Observation Apparent recovery of fertilizer N reached 111% of primary N where SN66 followed PN50
Mechanism The high DM response appears associated with inclusion of growths given no fertilizer N

Mechanismhypothesisoriginal resultmeasured

Claim · model-written summary

The high DM response appears associated with inclusion of growths given no fertilizer N

Taxon: perennial ryegrassLolium perennee0
Outcome: DM responsee1
Qualifier: inclusion of growths given no fertilizer Ne2

Verbatim

e0
“from primary growth and two successive regrowths of perennial ryegrass”
✓ located verbatim in the source · abstract, characters 50–120

e1
“High available soil N is partly responsible for both high apparent recovery of N and high DM response”
✓ located verbatim in the source · abstract, characters 865–966

e2
“The latter appears to be associated with inclusion of growths given no fertilizer N”
✓ located verbatim in the source · abstract, characters 968–1051

Title

INTERACTIONS BETWEEN FIRST AND SECOND APPLICATIONS OF FERTILIZER NITROGEN AND IMPLICATIONS IN EFFICIENCY OF NITROGEN USE

I. V. Hunt; J. Frame; R. D. Harkess W Grass and Forage Science 1975. doi:10.1111/j.1365-2494.1975.tb01372.x

Other claims from this paper (9)

Observation Primary growth gave a response of 24·2 kg DM/kg applied N to PN50
Observation Only a further l±0 kg DM/kg applied N came from the second PN increment (value garbled in source)
Observation A significant interaction between PN and SN treatments was shown in second growth
Observation The residual DM response to PN was highest at SN0
Association The residual DM response to PN reduced as the SN level was raised
Intervention effect Substantially greater residual responses to PN treatments were shown in the third growth
Observation Third growth DM responses to SN treatments were high
Observation Apparent recovery of fertilizer N reached 111% of primary N where SN66 followed PN50
Mechanism High available soil N partly explains both high apparent N recovery and high DM response

“nitrogen use efficiency”

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