Vegetative Activity of the Main Stem Terminal Bud Under Photoperiod and Flower Removal Treatments in Soybean

Caffaro, SV; Nakayama, F.

doi:10.1071/pp9880475

Cited by 9 publications

(3 citation statements)

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“…A soybean cultivar will generally produce greater vegetative growth and dry matter as the photoperiod is increased (Johnson and Major, 1979). Greater internode elongation and leaf expansion also occur as the photoperiod increases (Caffaro and Nakayama, 1988). Soybean cultivars are classified according to maturity groups, ranging from 00 (early maturity) to VIII (late maturity), reflecting the photoperiod that maximizes grain yield.…”

Section: Soybean Cultivars Evaluated For Forage Productionmentioning

confidence: 99%

Growth, Development, and Yield of Soybean Lines Developed for Forage

Darmosarkoro

Harbur

Buxton³

et al. 2001

Agronomy Journal

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to Fehr and Caviness (1977), but the total protein content of the plant continues to increase with pod fill until Recently, soybean [Glycine max (L.) Merr.] cultivars have been stage R7 (Willard, 1925; Good, 1942;Munoz et al., 1983; developed specifically for use as a forage crop. The objective of this Ritchie et al., 1982). For this reason, Good (1942) found study was to determine the effect of maturity group on and compare the agronomic performance of forage and grain soybean cultivars in that late-cut soybean hay contained a greater proportion Iowa. In 1994, 13 forage-and five grain-type cultivars were studied.of protein and oil than did early-cut hay.In 1995, one additional forage cultivar and grain cultivar were each Soybean leaf dry matter and total dry matter are also evaluated. Node number, plant height, lodging, and dry matter accuinfluenced by photoperiod. A soybean cultivar will genmulation were measured biweekly during the growing season. By 135 erally produce greater vegetative growth and dry matter days after planting (DAP), forage cultivars yielded 5 to 19% more as the photoperiod is increased (Johnson and Major, dry matter than 'Sherman', which had the greatest yield among grain 1979). Greater internode elongation and leaf expansion cultivars. Forage cultivars were 37 to 69% taller than 'Biloxi', the also occur as the photoperiod increases (Caffaro and tallest grain cultivar, which may partially explain the greater lodging Nakayama, 1988). Soybean cultivars are classified acof the forage cultivars compared with the grain cultivars. Forage cording to maturity groups, ranging from 00 (early matucultivars initiated reproductive growth 60 to 88 DAP, whereas the locally adapted Sherman cultivar initiated reproductive growth 55 rity) to VIII (late maturity), reflecting the photoperiod DAP. Forage cultivars produced more dry matter than grain cultivars, that maximizes grain yield. but had a lower leaf/stem ratio and leaf ϩ pod/stem ratio in AugustThe objectives of this study were to compare the and September, respectively, which may reduce forage quality. Forage vegetative growth, development, and aboveground dry cultivars developed in Pennsylvania generally accumulated more dry matter yield of grain-type and experimental forage-type matter than forage cultivars developed in Virginia by late August, soybean cultivars in Iowa and to determine whether but initiated reproductive growth sooner and produced less dry matter differences between forage and grain cultivars were due by late September. The significant productivity differences observed to maturity group or other qualities. between forage and grain cultivars suggest the potential of breeding to improve the forage potential of soybean. MATERIALS AND METHODS Location and DesignThe center two rows from each four-row plot were sampled. Dry matter production was determined by harvesting all the aboveground plant material from the southern 1.5 m of the

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Section: Soybean Cultivars Evaluated For Forage Productionmentioning

confidence: 99%

Growth, Development, and Yield of Soybean Lines Developed for Forage

Darmosarkoro

Harbur

Buxton³

et al. 2001

Agronomy Journal

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“…Period of time and growing degree days to reach flowering stage 147 (Rl) expansion than under short photoperiod (Caffaro and Nakayama, 1988). An experiment in 1984 and showed that under 10 h daylength, cv.…”

Section: Ust Of Tablesmentioning

confidence: 99%

“…Maturity group determines the adaptation of soybean to length of day, which in turn determines reproductive development. Caffaro and Nakayama (1988) found that under a long photoperiod, soybean cv. Williams and Bragg had greater intemode elongation and leaf expansion.…”

Section: Forage Quality Of Soybeanmentioning

confidence: 99%

Agronomic performance and nutritive value of soybean lines developed for forage

Darmosarkoro

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This is to certify that the doctoral dissertation of WiQ'aksana Darmosarkoro has met the dissertation requirements of Iowa State University Committee Member Committee Member Committee Member Committee Meniber Majo/yProfessor For the Graduate College Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy. Signature was redacted for privacy.

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