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“decrease in density”

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Organism: Oryza sativa ✕

Observationobservedoriginal resultpositivemeasured

Claim · model-written summary

Planthopper density showed a remarkable decrease in 1969 due to unknown factors, which caused little occurrence of rice stripe virus disease.

Taxon: riceOryza sativae3
Interactor: planthoppere3pest
Second interactor: rice stripe virusTenuivirus oryzaclavataee3pathogen
Outcome: density of planthoppere3
Direction: decreasee3
Qualifier: due to unknown factorse3

Verbatim

e3
“In 1969, density of planthopper showed remarkable decrease due to unknown factors, which caused little occurrence of the rice stripe virus disease”
✓ located verbatim in the source · abstract, characters 302–448

Title

Recent trend of percentage of infective planthopper, Laodelphax striatellus (Fallén), transmitting the rice stripe virus, in Kyushu

Ryoiti KISIMOTO Kyushu Plant Protection Research 1971. doi:10.4241/kyubyochu.17.112

Other claims from this paper (3)

Intervention effectobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Raising density from two to four or six transplants per hill significantly increased grain yield in all varieties except Jhona 349.

Taxon: RiceOryza sativat0
Treatment: 4 and 6 transplants/hille0
Outcome: grain yielde0
Direction: highere0
Qualifier: except Jhona 349e0
Comparator: 2e0

Verbatim

e0
“Increase in plant population from 2 to 4 and 6 transplants/hill resulted in significantly higher grain yield in all varieties except Jhona 349 where there was a decrease at 6 transplants/hill.”
✓ located verbatim in the source · abstract, characters 963–1155

t0
“Rice”
✓ located verbatim in the source · title, characters 15–19

Title

Performance of Rice Varieties in a Highly Saline Sodic Soil as Influenced by Plant Population

K. S. Dargan; I. P. Abrol; D. R. Bhumbla Agronomy Journal 1974. doi:10.2134/agronj1974.00021962006600020028x

Other claims from this paper (6)

Observation IR 8–68 at six transplants per hill had the highest grain yield, 57.33 quintals/ha.
Observation IR 8 at six transplants per hill ranked next in yield.
Observation Jhona 349 at four transplants per hill ranked next in yield.
Intervention effect At six transplants per hill, Jhona 349 yield decreased.
Mechanism Higher yield resulted from increased survival of hills.
Mechanism Higher yield also resulted from more panicle bearing tillers per hill.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Rice grain yield was lower with 81 stylo plants per square metre than in monoculture.

Taxon: RiceOryza sativae0
Treatment: grown with 81 stylo plants/m. 2e0
Interactor: styloStylosanthes guianensise0weed
Outcome: Rice grain yielde0
Direction: decreaseinferrede0
Value: 63·4 gm./m. 2e0
Qualifier: 98·4 gm./m. 2e0
Comparator: monoculturee0

Verbatim

e0
“Rice grain yield varied from 98·4 gm./m. 2 in monoculture to 63·4 gm./m. 2 when grown with 81 stylo plants/m. 2”
✓ located verbatim in the source · abstract, characters 258–369

Title

Undersowing Rice (Oryza sativa) with Stylosanthes guyanensis. I. Plant Density

H. M. Shelton; L. R. Humphreys Experimental Agriculture 1975. doi:10.1017/s0014479700006529

Other claims from this paper (3)

Association Rice vegetative growth declined as stylo density increased.
Observation Rice was more competitive than stylo in mixed culture.
Association Stylo growth was relatively independent of rice density from 20 to 120 rice plants per square metre.

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