Abstract
Summary The emergence and development of A fatua were studied in 23 spring barly fields in 1972 and nine in 1973 nautarally infested with yhe weed. Emergence occurred up to the four‐leaf stages of the crop. The mean number of days from drilling to 50% emergence of A fatua plants was 22 in 1972 and 36 in 1973.The majority of seeds were shed by early emerging plants in 1972, 79% and in 1973. 59% of A fatua plants had emerged by the two‐leaf stage of the crop and these plants produced 97 and 89% respectively of all the seed shed. In both years, A fatua plants emerging before the crop produced five times as many seeds per plant as those emerging between the crop two and three‐leaf stages. The earliest emerging plants were also the heaviest and had most stems per plant.In both years there was a significant relationship between the density of A fatua plants in the crop in spring and their mortality.A large variation occured between the sites in the number of A fatua plants that emerged by a given crop leaf stage. In 1973.insufficient numbers of sites were investigatesd to derive a relationship between time to A fatua emergence and crop yield loss, but in 1972, a given density of A fatua plants emerging at an early stage caused agreater crop yields loss than the same density emerging later. This was also evident to aleser extent in data derived from a similar series of 15 experiments in 1971.
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Claims 14
Claim · model-written summary
Avenu fatua emergence occurred up to the four-leaf stage of the crop.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e1“Emergence occurred up to the four‐leaf stages of the crop”
Claim · model-written summary
Avenu fatua plants took a mean of 22 days from drilling to 50% emergence in 1972.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e2“The mean number of days from drilling to 50% emergence of A fatua plants was 22 in 1972 and 36 in 1973”
Claim · model-written summary
Avenu fatua plants took a mean of 36 days from drilling to 50% emergence in 1973.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e2“The mean number of days from drilling to 50% emergence of A fatua plants was 22 in 1972 and 36 in 1973”
Claim · model-written summary
In 1972, most seeds were shed by early emerging Avenu fatua plants (79%).
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e3“The majority of seeds were shed by early emerging plants in 1972, 79% and in 1973”
Claim · model-written summary
In 1973, most seeds were shed by early emerging Avenu fatua plants.
Not reportedValue
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e3“The majority of seeds were shed by early emerging plants in 1972, 79% and in 1973”
Claim · model-written summary
In 1972, Avenu fatua plants that had emerged by the two-leaf stage produced 97% of all seed shed.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e4“59% of A fatua plants had emerged by the two‐leaf stage of the crop and these plants produced 97 and 89% respectively of all the seed shed”
Claim · model-written summary
In 1973, Avenu fatua plants that had emerged by the two-leaf stage produced 89% of all seed shed.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e4“59% of A fatua plants had emerged by the two‐leaf stage of the crop and these plants produced 97 and 89% respectively of all the seed shed”
Claim · model-written summary
59% of Avenu fatua plants had emerged by the two-leaf stage of the crop.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e4“59% of A fatua plants had emerged by the two‐leaf stage of the crop and these plants produced 97 and 89% respectively of all the seed shed”
Claim · model-written summary
Avenu fatua plants emerging before the crop produced five times as many seeds per plant as those emerging between the crop two and three-leaf stages.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e5“In both years, A fatua plants emerging before the crop produced five times as many seeds per plant as those emerging between the crop two and three‐leaf stages”
Claim · model-written summary
Mortality of Avenu fatua plants in the crop was significantly related to their spring density.
Not reportedDirection
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e6“In both years there was a significant relationship between the density of A fatua plants in the crop in spring and their mortality. A large variation occured between the sites in the number of A fatua plants that emerged by a given crop leaf stage”
Claim · model-written summary
The number of Avenu fatua plants emerging by a given crop leaf stage varied largely between sites.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e6“In both years there was a significant relationship between the density of A fatua plants in the crop in spring and their mortality. A large variation occured between the sites in the number of A fatua plants that emerged by a given crop leaf stage”
Claim · model-written summary
In 1972, early emerging Avenu fatua at a given density caused greater spring barley yield loss than the same density emerging later.
- Taxon
- spring barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- a given density of A fatua plants emerging at an early stagee7
- Interactor
- A fatuae7weed
- Outcome
- crop yields losse7
- Direction
- agreatere7
- Comparator
- the same density emerging latere7
- Setting
- 1972e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e7“but in 1972, a given density of A fatua plants emerging at an early stage caused agreater crop yields loss than the same density emerging later. This was also evident to aleser extent in data derived from a similar series of 15 experiments in 1971”
Claim · model-written summary
In 1971 experiments, early emerging Avenu fatua at a given density also caused spring barley yield loss, to a lesser extent than in 1972.
- Taxon
- spring barleyHordeum vulgaret0
- Treatment
- a given density of A fatua plants emerging at an early stagee7
- Interactor
- A fatuae7weed
- Outcome
- crop yields losse7
- Direction
- higherinferrede7
- Qualifier
- aleser extente7
- Comparator
- the same density emerging latere7
- Setting
- a similar series of 15 experiments in 1971e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e7“but in 1972, a given density of A fatua plants emerging at an early stage caused agreater crop yields loss than the same density emerging later. This was also evident to aleser extent in data derived from a similar series of 15 experiments in 1971”
Claim · model-written summary
The earliest emerging Avenu fatua plants were the heaviest and had the most stems per plant.
Verbatim
t0“competition between Avenu fatua L. and spring barley”
e0“The earliest emerging plants were also the heaviest and had most stems per plant”