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“decrease in density”

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Organism: Zea mays ✕

Associationobservedoriginal resultmixedsimulated

Claim · model-written summary

Insecticide use may increase or decrease depending on field pest density.

Taxon: CornZea mays subsp. mayst0
Outcome: insecticide usee0
Direction: increase or decreasee0
Qualifier: pest densities on individual fieldse0

Not reportedComparator

Verbatim

e0
“Depending on pest densities on individual fields, insecticide use may increase or decrease.”
✓ located verbatim in the source · abstract, characters 566–657

t0
“Corn”
✓ located verbatim in the source · title, characters 66–70

Title

Insecticide Use and Crop Rotation under Risk: Rootworm Control in Corn

William F. Lazarus; Earl R. Swanson American Journal of Agricultural Economics 1983. doi:10.2307/1240462

Other claims from this paper (4)

Observation Crop insurance may lead a risk-averse farmer to choose a riskier cropping program.
Association Reduced risk aversion leads to greater specialization in corn.
Association Reduced risk aversion increases the insecticide threshold.
Association Reduced risk aversion increases the rotation threshold.

Intervention effectobservedoriginal resultmixedmeasured

Claim · model-written summary

Zhengdan958 rind strength was unchanged except for a decrease in the third internode.

Taxon: maizeZea mayse1
Material: Zhengdan958e0
Treatment: high densitye2
Outcome: rind penetration strengthe0
Direction: unchangede0
Comparator: medium density(52 500 plants/ha)e3

Verbatim

e0
“while Zhengdan958 was unchanged, except that the rind penetration strength of the third internode decreased”
✓ located verbatim in the source · abstract, characters 776–883

e1
“maize cultivars”
✓ located verbatim in the source · abstract, characters 15–30

e2
“Under high density condition”
✓ located verbatim in the source · abstract, characters 683–711

e3
“medium density(52 500 plants/ha)”
✓ located verbatim in the source · abstract, characters 116–148

Title

Effects of the Plant Density on the Characteristics of Maize Stem and Ear

Jiang Wen Yumi kexue 2009

Other claims from this paper (7)

Intervention effect High density did not affect plant height and ear height.
Intervention effect High density did not affect the length of internodes other than the first.
Intervention effect High density decreased third internode stem diameter.
Association At medium density Jinhai 5 had higher rind penetration strength than Zhengdan958.
Intervention effect High density decreased Jinhai 5 rind penetration strength.
Intervention effect High density decreased ear length, kernel number per line and hundred kernel weight.
Intervention effect Both cultivars had their highest yield at higher density.

Intervention effectobservedoriginal resultmixedmeasured

Claim · model-written summary

No‐till changes in plants per hectare ranged from a 22% decrease to a 4% increase.

Taxon: MaizeZea mayst0
Treatment: no‐tille0
Outcome: plants/hae0
Direction: decrease to a 4% increasee0
Value: 22% decrease to a 4% increasee0
Comparator: conventionale1

Verbatim

e0
“Changes in plants/ha due to tillage ranged from a 22% decrease to a 4% increase under no‐till.”
✓ located verbatim in the source · abstract, characters 1461–1555

e1
“conventional (plowing followed by discing) vs. no‐till practices”
✓ located verbatim in the source · abstract, characters 480–544

t0
“Maize Hybrids”
✓ located verbatim in the source · title, characters 46–59

Title

No‐Till Effects on Yield and Plant Density of Maize Hybrids¹

E. L. Anderson Agronomy Journal 1986. doi:10.2134/agronj1986.00021962007800020022x

Other claims from this paper (9)

Association Hybrid by tillage interaction was not significant for plant density.
Association Hybrid by tillage interaction was inconsequential for grain yield except at Beltsville.
Observation No hybrid consistently performed better under conventional tillage.
Intervention effect In 1982 tillage did not significantly affect grain yield.
Intervention effect In 1983 no‐till grain yield exceeded conventional yield by 17 to 24% at three locations.
Intervention effect In 1984 no‐till increased yield by 19% at one location.
Association Grain yield and plants per hectare were not significantly correlated.
Recommendation The authors concluded that selecting genetic traits for no‐till yield may be unnecessary in this area.
Observation The authors concluded these hybrids would produce similar grain under either tillage practice.

Method / resourceobservedoriginal resultmixedmeasured

Claim · model-written summary

Inflection-point densities allowed both species to increase or decrease biomass across mixtures.

Taxon: maizeZea mayse1
Outcome: biomass productione0
Direction: increases or decreasese0
Comparator: smaller speciese0

Verbatim

e0
“functional densities at which the biomass accumulation inflection point for the smaller species allowed both species to exhibit either increases or decreases in biomass production depending on competitive interactions for all interspecific mixtures”
✓ located verbatim in the source · abstract, characters 1086–1334

e1
“maize ( Zea mays L.)”
✓ located verbatim in the source · abstract, characters 755–775

Title

Addressing biases in replacement series: the importance of reference density selection for interpretation of competition outcomes

Ramon G. Leon; Fernando H. Oreja; Steven B. Mirsky; et al. Weed Science 2023. doi:10.1017/wsc.2023.53

Other claims from this paper (5)

Method / resource Reference density criteria substantially changed inferred competitive interactions.
Method / resource The maximum-biomass model favored the larger species and nearly inhibited growth of the smaller species.
Method / resource The nitrogen-uptake equivalency model produced interactions closer to neutral competition.
Method / resource The biomass inflection-point model was the most sensitive and informative across mixtures.
Recommendation Reference density selection should meet sensitivity and within-species competition criteria.

Observationobservedoriginal resultmixedmeasured

Claim · model-written summary

SY Chorintos yield increased to 60 thousand/ha and decreased at 80,000 plants/ha.

Taxon: maizeZea mayst0
Material: SY Chorintose0
Outcome: yield formatione0
Qualifier: parabolic naturee0

Verbatim

e0
“SY Chorintos hybrid had a parabolic nature of yield formation, i.e. yield increase up to a density of 60 thousand/ha and yield decrease with an increase in density to 80,000 plants /ha.”
✓ located verbatim in the source · abstract, characters 1508–1693

t0
“maize hybrids”
✓ located verbatim in the source · title, characters 12–25

Title

Response of maize hybrids on increasing plant density in the agrocenosis in the Northern Steppe of Ukraine

I. V. Aksyonov; M. V. Kotchenko The Scientific Journal Grain Crops 2024. doi:10.31867/2523-4544/0321

Other claims from this paper (9)

Observation SY Rotango was strongly susceptible to crowding stress.
Intervention effect Increasing density did not enhance SY Rotango yield.
Intervention effect DB Khotyn had maximum yield of 7.43 t/ha at 60,000 plants/ha.
Intervention effect SY Scorpius had maximum yield of 8.4 t/ha at 60,000 plants/ha.
Intervention effect SY Chorintos had maximum yield of 8.54 t/ha at 60,000 plants/ha.
Observation Adevey had low susceptibility to crowding stress.
Intervention effect Adevey maximum yield was 7.63 t/ha at 80 thousand/ha.
Recommendation The authors advise against SY Rotango cultivation at high density.
Recommendation The authors recommend Adevey for higher plant density in the arid Northern Steppe of Ukraine.

Intervention effectobservedoriginal resultmixedsignificant (as stated)measured

Claim · model-written summary

Removing 50% of the ear significantly decreased grain numbers but increased 1000-grain weight.

Taxon: cornZea mays subsp. mayse0
Treatment: removal of 50% of eare0
Outcome: grains in the corn and the number of grains per square metere0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“removal of 50% of ear due to significant decrease of grains in the corn and the number of grains per square meter in spite of the increase of the weight of 1000-grain”
✓ located verbatim in the source · abstract, characters 1265–1431

Title

The effect of source-sink restriction and plant density changes on the role of assimilate remobilization in corn grain yield.

Fatemeh Falihzade; Mani Mojadam; Shahram Lack International Journal of Agriculture and Crop Sciences (IJACS) 2013

Other claims from this paper (15)

Intervention effect Source-sink restriction and density significantly affected photosynthesis and assimilate remobilization rate, contribution and efficiency.
Observation The untreated control had the highest grain yield, 868.67 g/m 2.
Observation Removing 50% of the ear gave the lowest grain yield, 646.33 g/m 2.
Intervention effect Removing 50% of the ear increased 1000-grain weight.
Observation Ear removal produced the lowest remobilization rate and contribution, 9.9%.
Observation Defoliating upper leaves produced the highest remobilization rate and contribution, 39.31%.
Observation Upper-leaf defoliation significantly decreased photosynthesis contribution to 60.69%.
Intervention effect Increasing density significantly increased grain yield.
Intervention effect Increasing density increased grains per square meter and 1000-grain weight.
Intervention effect Increasing density decreased grains per ear.
Observation At 90000 plants per hectare, grain yield was highest at 886.33 g/m 2.
Observation At 90000 plants per hectare, photosynthesis contribution was lowest at 71.74%.
Observation At 90000 plants per hectare, remobilization contribution was highest at 28.26%.
Observation Upper-leaf defoliation at 90000 plants per hectare gave the highest remobilization contribution, 43.37%.
Observation Upper-leaf defoliation at 90000 plants per hectare gave the lowest photosynthesis contribution, 56.63%.

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