Abstract
Abstract Maize (hybrid PX61O) was sown at 85000 (Treatment 1), 181000 (Treatment 2), and 362 000 (Treatment 3) seeds per hectare in large plots (1.0 ha in 1975‐76; 0.5 ha in 1976‐77). In 1976‐77 (Year 2) deaths of maize plants were greatest during the first 110 days growth and amounted to 10, 11, and 24% of established seedlings for Treatments 1, 2, and 3, respectively. Total dry weight per plant, the proportions of leaves, stem, grain, cob, and tassel, and the concentrations ofN, P, K, Na, Ca, and Mg, were assessed at intervals until the ‘hard dent’ growth stage (30‐35% total plant DM), about 160 days from sowing. High plant population densities had little effect on mineral concentration, but reduced total dry weight per plant and reduced the weight of individual shoot components, especially leaves, stems, and grain. For Treatments 1, 2, and 3 respectively in Year 2, grain represented 38, 28, and 21 % of plant dry weight at 144 days from planting and 49, 43, and 33% of plant dry weight at 167 days from planting. At the ‘hard‐dent’ growth stage in 1975‐76 (Year 1), sampling estimates of DM yield per hectare of 21.3, 27.4, and 36.1 t.ha ‐1 for Treatments 1, 2, and 3, respectively, were 12, 38, and 68% greater than yields measured by harvesting whole plots. In Year 2, yield estimates of 22.0, 25.0, and 24.4 t.ha ‐1 of DM for these treatments were 8, 14, and 4%, respectively, above yields measured by total harvest. The optimum plant population for maize silage, the growth and development of maize grown at different plant populations, the quality of the crop at ensiling, and problems encountered in accurately sampling large plots of maize for estimation ofDM yield per hectare are discussed.
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Claims 14
Claim · model-written summary
In year 2, seedling deaths were 10% at Treatment 1 during the first 110 days.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deaths of maize plants were greatest during the first 110 days growth and amounted to 10, 11, and 24% of established seedlings for Treatments 1, 2, and 3, respectively”
e1“85000 (Treatment 1)”
Claim · model-written summary
In year 2, seedling deaths were 11% at Treatment 2 during the first 110 days.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deaths of maize plants were greatest during the first 110 days growth and amounted to 10, 11, and 24% of established seedlings for Treatments 1, 2, and 3, respectively”
e1“181000 (Treatment 2)”
Claim · model-written summary
In year 2, seedling deaths were 24% at Treatment 3 during the first 110 days.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“deaths of maize plants were greatest during the first 110 days growth and amounted to 10, 11, and 24% of established seedlings for Treatments 1, 2, and 3, respectively”
e1“362 000 (Treatment 3)”
Claim · model-written summary
High population density had little effect on mineral concentration.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High plant population densities had little effect on mineral concentration”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
High plant density reduced total dry weight per plant.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High plant population densities had little effect on mineral concentration, but reduced total dry weight per plant and reduced the weight of individual shoot components, especially leaves, stems, and grain”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
High plant density reduced weights of leaves, stems and grain.
- Treatment
- High plant population densitiese1
- Outcome
- weight of individual shoot components, especially leaves, stems, and graine0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced the weight of individual shoot components, especially leaves, stems, and grain”
e1“High plant population densities”
e2“Maize (hybrid PX61O)”
Claim · model-written summary
At 144 days, grain comprised 38%, 28%, and 21% of plant dry weight at Treatments 1, 2, and 3.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain represented 38, 28, and 21 % of plant dry weight at 144 days from planting”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
At 167 days, grain comprised 49%, 43%, and 33% of plant dry weight at Treatments 1, 2, and 3.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“49, 43, and 33% of plant dry weight at 167 days from planting”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
Year 1 Treatment 1 sample yield estimate was 21.3 t per hectare and 12% above whole plot harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sampling estimates of DM yield per hectare of 21.3, 27.4, and 36.1 t.ha ‐1 for Treatments 1, 2, and 3, respectively, were 12, 38, and 68% greater than yields measured by harvesting whole plots”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
Year 1 Treatment 2 sample yield estimate was 27.4 t per hectare and 38% above whole plot harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sampling estimates of DM yield per hectare of 21.3, 27.4, and 36.1 t.ha ‐1 for Treatments 1, 2, and 3, respectively, were 12, 38, and 68% greater than yields measured by harvesting whole plots”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
Year 1 Treatment 3 sample yield estimate was 36.1 t per hectare and 68% above whole plot harvest.
- Outcome
- DM yield per hectaree0
- Direction
- greatere0
- Value
- 36.1 t.ha ‐1e0
- Comparator
- harvesting whole plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sampling estimates of DM yield per hectare of 21.3, 27.4, and 36.1 t.ha ‐1 for Treatments 1, 2, and 3, respectively, were 12, 38, and 68% greater than yields measured by harvesting whole plots”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
Year 2 Treatment 1 sample yield estimate was 22.0 t per hectare, 8% above total harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield estimates of 22.0, 25.0, and 24.4 t.ha ‐1 of DM for these treatments were 8, 14, and 4%, respectively, above yields measured by total harvest”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
Year 2 Treatment 2 sample yield estimate was 25.0 t per hectare, 14% above total harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield estimates of 22.0, 25.0, and 24.4 t.ha ‐1 of DM for these treatments were 8, 14, and 4%, respectively, above yields measured by total harvest”
e1“Maize (hybrid PX61O)”
Claim · model-written summary
Year 2 Treatment 3 sample yield estimate was 24.4 t per hectare, 4% above total harvest.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yield estimates of 22.0, 25.0, and 24.4 t.ha ‐1 of DM for these treatments were 8, 14, and 4%, respectively, above yields measured by total harvest”
e1“Maize (hybrid PX61O)”
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