Breeding forage maize varieties for Britain

Gunn, R. E.

doi:10.1111/j.1744-7348.1977.tb01885.x

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…The crude-protein concentration in the dry matter averaged 11-5 % and was not affected by N manuring, again suggesting that the soil N status was adequate in all treatments. The crude-protein concentrations were advantageously higher than the 10% quoted by Gunn (1977) for forage from maize grown in Britain and which he noted was insufficient to meet the metabolic requirement of certain olasses of livestock such as young cattle and lactating cows.…”

Section: Nitrogen Manuringmentioning

confidence: 79%

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: Nitrogen Manuringmentioning

confidence: 79%

The potential of maize as a forage crop in Scotland

Potts¹,

Waterson²,

Rodger³

et al. 1979

J. Agric. Sci.

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“…(1912) reported l07o greater fibre digestibility and 29Vo greater dry matter consumption with bm, than with normal stover silage. Rook et al (1977) (Gunn 1977), as suggested by Deinum (1976).…”

Section: Brown Midrib Hybrids For Corn Silagementioning

confidence: 93%

Factors Influencing the Utilization by Ruminants of Corn Silage in Marginal Growing Areas

Fisher¹,

Fairey²

1979

Can. J. Anim. Sci.

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The effects of various factors which influence the utilization of silage, made from forage corn grown in marginal areas for production, by ruminant animals are reviewed, with particular reference to dairy cattle. Crop maturity and composition and their effects on important animal performance characteristics are discussed in detail. Effects of the dry matter and grain contents of the ensiled corn on the nature of silage and the resulting animal responses are also considered. The declining emphasis on assessing the quality of forage corn by its grain content, and the increased emphasis on the selection of hybrids based on shoot dry matter yields are discussed from both crop and animal production viewpoints. For instance, the results of feeding trials where high crop densities, various genetic mutants and tillering hybrids were studied are discussed. Consideration is given to the laboratory evaluation and use of various agronomic characteristics to assess the nutritive value of forage corn. It is concluded that more emphasis should be placed on the breeding of corn genotypes specifically for forage production by selecting for maximum digestible dry matter yields per unit land area, particularly when dry matter content is unlikely to exceed 25%. Evaluation of the forage potential of corn genotypes should be conducted under systems of management specifically suited to maximizing whole-crop, dry matter yields. Also, with the utilization of mutant types of corn with higher digestibilities than normal corn genotypes, routine laboratory analysis for digestibility will become necessary. The final comparison of promising genotypes will need to be done with animals capable of relatively high levels of production.

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Hybrid Maturity and the Relative Importance of Grain and Stover for the Assessment of the Forage Potential of Maize Genotypes Grown in Marginal and Non-Marginal Environments

Fairey¹

1980

Can. J. Plant Sci.

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FlInrv, N. A. 1980. Hybrid maturity and the relative importance of grain and stover for the assessment of the forage potential of maize genotypes grown in marginal and non-marginal environments. Can. J. Plant Sci. 60: 539-545.Ninety-seven maize hybrids of differing maturities and genetic constitutions were grown at three somewhat dissimilar environments (Agassiz, Sumas and Surrey) in British Columbia. The study attempted to elucidate the nature of relationships existing between important perfornance characteristics of maize for both forage (whole crop) and grain production. Forage yield was linearly related to grain yield at each location and the relationship was distinct for each location. However, grain yield was not a good indicator offorage productivity, with coefficients ofdetermination of 51.0, 33. I and 13.5Vo for Agassiz, Sumas and Surrey, respectively. Maize hybrids best adapted for forage production were somewhat later in corn heat unit (CHU) maturity ratings than those adapted for grain production. However, the CHU rating system appears to be less useful for making practical management decisions on the most suitable hybrid maturity for the production of forage than it is for the production of grain. At each location, forage DM content was dependent on the DM content of the stover and the proportion of total DM as grain or in the ear. In future, greater emphasis should be given to evaluating maize varieties independently for forage and grain production, and to the quality and yield of the stover component of forage maize. varieties intended for forage production has also been emphasized by Gunn (197 5, 1977) and Gallais et al. (19'16

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Breeding forage maize varieties for Britain

Cited by 3 publications

References 14 publications

The potential of maize as a forage crop in Scotland

The potential of maize as a forage crop in Scotland

Factors Influencing the Utilization by Ruminants of Corn Silage in Marginal Growing Areas

Hybrid Maturity and the Relative Importance of Grain and Stover for the Assessment of the Forage Potential of Maize Genotypes Grown in Marginal and Non-Marginal Environments

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