Maize physiology in relation to breeding for a northern climate

Bunting, E. S.

doi:10.1111/j.1744-7348.1977.tb01884.x

Cited by 2 publications

(4 citation statements)

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“…The mean values are summarized in Table 8. Table 9 shows the date at which the accumulated Ontario Units attained 1379 and 2179, suggested by Bunting (1977) as being necessary to attain midsilk and maturity (for silage) in the variety Inra 200.…”

Section: Time Of Sowing and Plant Population Density Trialsmentioning

confidence: 99%

“…Poor ear development even in the more favourable seasons of 1975 and 1976 and low dry-matter contents are almost entirely due to a lack of heat during the growing season since moisture following sowing, considered important by Bunting (1971) and Tiley (1977), was not considered to be limiting. In most years the cumulative total of Ontario Units did not reach 1379 (Table 9), found by Bunting (1977) to be associated with the mid-silk stage of development, until mid-August as opposed to early August in southern England. In fact the final sowing in 1972 never attained this value nor was there any appreciable formation of silks.…”

Section: X -mentioning

confidence: 99%

“…Sowings made after mid-May had no apparent advantage in terms of early vigour and this was confirmed by their yields and maturities at harvest. Bunting (1977) suggests that 2179 Ontario Units are required to mature a crop of the variety Inra 200 for silage: a variety comparable in maturity to Dekalb 202. The date at which this value is attained in Scotland is usually mid-to late October (Table 9), a time when in many parts wet soil conditions would prevent machine harvesting.…”

Section: Date Of Sowingmentioning

confidence: 99%

“…Accumulated Ontario Units from sowing to harvest, which is also confounded with date of sowing, did not in itself account for any more of the variance. Carr (1977) suggested that the date of 50% silking was more closely associated with yield and maturity than the seasonally accumulated Ontario Units and Bunting (1977) suggested that 1379 + 47-5 Ontario Units were required for the variety Inra 200 to reach this stage of development. At all the Scottish sites this figure was usually attained at a considerably later date than the 4 August mean for the south of England (Table 9).…”

Section: Influence Of Temperaturementioning

confidence: 99%

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The potential of maize as a forage crop in Scotland

Potts¹,

Waterson²,

Rodger³

et al. 1979

J. Agric. Sci.

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SUMMARYBetween 1972 and 1976 a series of 15 trials was carried out at various climatically favoured sites throughout Scotland to assess the potential of new hybrid maize varieties of European origin under Scottish conditions. No meaningful differences were found between varieties in respect of dry-matter yield or maturity.Seed rates ranged from 100 to 200 × 103 seeds/ha giving final stands from 40 to 194 × 103 plants/ha. Regression analyses for the variety Dekalb 202 included in 54 treatments indicated that the relationship between plant population density and dry-matter yield was partly linear with an important quadratic function, suggesting an optimum of 179 × 103 (± 80 × 103) plants/ha. Plant population density accounted for 65·9% (P < 0·01) of the variance in dry-matter yield but was not significantly related to dry-matter content.Climatic variation between years had no overriding influence on growth and development. Dry-matter production for the variety Dekalb 202 sown in mid-May ranged from 2·86 (1972) to 14·54 t/ha (1975) with associated dry-matter contents of 15·1 and 24·1% respectively. In a few instances slightly higher dry-matter contents (maximum 28·6%) from mid-May sowings were associated with lower yields.Neither date of sowing nor accumulated temperature to harvest measured as Ontario Heat Units was significantly related to yield but date of sowing accounted for 29·5% (P < 0·01) of the variance in dry-matter content. Accumulated Ontario Units at harvest were not significantly related to dry-matter content.An interesting relationship between dry-matter yield and the date on which the crop had received 1379 Ontario Units was found. This relationship may be useful in selecting sites at which maize may be grown or to predict maximum potential final yield in any given season.

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Section: Time Of Sowing and Plant Population Density Trialsmentioning

confidence: 99%