Abstract
Seed production trials in Canterbury have shown (1) strong negative relationships between plant density and seed yields per plant, and (2) plant density ranges above which high plant numbers failed to compensate for low yields per plant and below which high yields per plant failed to compensate for low plant numbers. The net result was that seed yields per unit area tended to plateau at this density range, with no further gains being made by increasing plant numbers. It is concluded that the function of seeding rate is to provide sufficient viable seeds to attain this density. Optimum density ranges for 'Grasslands Tama' Westerwolds ryegrass and 'Grasslands Nui' perennial ryegrass were 300 to 400 plants/m, and for 'Grasslands Matua' prairie grass 100 to I30 plants/m. The value of superphosphate and potassic fertilizers for seed production was doubtful, but nitrogen increased seed yields regardless of time of application. Work in Canterbury concentrated on the time of N application and showed that nitrogen for seed production was most efficient when applied just after stem elongation had commenced. Grazing grass-seed crops reduced seed yields because of an indirect negative effect on seedhead size and individual seed weights, both of which proved to be more important than seedhead numbers in determining seed yields. Keywords: Seed production, grasses, plant density, nitrogen, stem elongation, grazing, seedhead size, seed weight.
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Claims 9
Claim · model-written summary
Plant density was negatively related to seed yield per plant.
Verbatim
e0“strong negative relationships between plant density and seed yields per plant”
t0“grass seed production studies in Canterbury”
Claim · model-written summary
Seed yield per area plateaued across the density range.
Verbatim
e0“seed yields per unit area tended to plateau at this density range, with no further gains being made by increasing plant numbers”
t0“grass seed production studies in Canterbury”
Claim · model-written summary
The optimum density for Grasslands Tama was 300 to 400 plants/m.
Verbatim
e0“Optimum density ranges for 'Grasslands Tama' Westerwolds ryegrass and 'Grasslands Nui' perennial ryegrass were 300 to 400 plants/m”
Claim · model-written summary
The optimum density for Grasslands Nui was 300 to 400 plants/m.
- Taxon
- perennial ryegrass
Lolium perennee0 - Material
- 'Grasslands Nui'e0
- Outcome
- Optimum density rangese0
- Value
- 300 to 400 plants/me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Optimum density ranges for 'Grasslands Tama' Westerwolds ryegrass and 'Grasslands Nui' perennial ryegrass were 300 to 400 plants/m”
Claim · model-written summary
The optimum density for Grasslands Matua was 100 to I30 plants/m.
Verbatim
e0“for 'Grasslands Matua' prairie grass 100 to I30 plants/m”
Claim · model-written summary
Nitrogen increased seed yields regardless of application time.
Not reportedComparator
Verbatim
e0“nitrogen increased seed yields regardless of time of application”
t0“grass seed production”
Claim · model-written summary
Nitrogen was most efficient just after stem elongation commenced.
Verbatim
e0“nitrogen for seed production was most efficient when applied just after stem elongation had commenced”
t0“grass seed production”
Claim · model-written summary
Grazing reduced grass seed yields.
Not reportedComparator
Verbatim
e0“Grazing grass-seed crops reduced seed yields”
Claim · model-written summary
Grazing negatively affected seedhead size and individual seed weights.
Not reportedComparator
Verbatim
e0“Grazing grass-seed crops reduced seed yields because of an indirect negative effect on seedhead size and individual seed weights”
t0“Recent grass seed production studies in Canterbury”