Abstract
Corn ( Zea mays L.) hybrids may show different silage quality responses to harvest date and cutting height because hybrids differ in neutral detergent fiber (NDF) digestibility. A brown midrib, leafy, and dual‐purpose hybrid were harvested at early [≈280 g kg −1 dry matter (DM) content], medium (≈350 g kg −1 ), and late (≈420 g kg −1 ) harvest dates at 15‐, 30‐, and 46‐cm cutting heights in 2001 and 2002 to determine optimum harvest management for each hybrid type. Most forage quality characteristics had hybrid × harvest date interactions as indicated by the 73 g kg −1 decrease in NDF digestibility of the brown midrib compared with 20 g kg −1 decreases of the other hybrids between the early and late harvest date. Milk per megagram, a forage quality index, declined (1523, 1487, and 1417 kg Mg −1 ), but DM yields increased (13.2, 13.6, and 14.1 Mg ha −1 ), so calculated milk yields were similar (20333, 20200, and 20233 kg ha −1 ) at early, medium, and late harvest dates, respectively, suggesting a broad optimum DM content for harvest. The sharp decline in NDF digestibility, however, raises concern about harvesting the brown midrib hybrid above 350 g kg −1 DM content. Calculated milk yield had a hybrid × cutting height interaction, as indicated by no change in the leafy hybrid and a 13% decrease in the brown midrib hybrid as cutting height increased from 15 to 46 cm. This suggests that an increase in cutting height may be a good management practice for the leafy hybrid but not for the brown midrib hybrid.
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Claims 10
Claim · model-written summary
NDF digestibility of the brown midrib corn hybrid decreased by 73 g kg-1 between the early and late harvest date.
- Taxon
- Corn
Zea mays subsp. mayst0 - Material
- brown midribe1
- Treatment
- late harvest datee1
- Outcome
- NDF digestibilitye1
- Direction
- decreasee1
- Value
- 73 g kg −1e1
- Comparator
- earlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the 73 g kg −1 decrease in NDF digestibility of the brown midrib compared with 20 g kg −1 decreases of the other hybrids between the early and late harvest date”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
NDF digestibility of the other corn hybrids decreased by 20 g kg-1 between the early and late harvest date.
- Taxon
- CornZea mays subsp. mayst0
- Material
- other hybridse1
- Treatment
- late harvest datee1
- Outcome
- NDF digestibilitye1
- Direction
- decreasese1
- Value
- 20 g kg −1e1
- Comparator
- earlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the 73 g kg −1 decrease in NDF digestibility of the brown midrib compared with 20 g kg −1 decreases of the other hybrids between the early and late harvest date”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
Milk per megagram, a forage quality index, declined from 1523 to 1487 to 1417 kg Mg-1 at early, medium and late harvest dates.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- harvest datese1
- Outcome
- Milk per megagrame1
- Direction
- declinede1
- Value
- 1523, 1487, and 1417 kg Mg −1e1
- Comparator
- earlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Milk per megagram, a forage quality index, declined (1523, 1487, and 1417 kg Mg −1 ), but DM yields increased (13.2, 13.6, and 14.1 Mg ha −1 ), so calculated milk yields were similar (20333, 20200, and 20233 kg ha −1 ) at early, medium, and late harvest dates, respectively”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
Dry matter yields increased from 13.2 to 13.6 to 14.1 Mg ha-1 at early, medium and late harvest dates.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- harvest datese1
- Outcome
- DM yieldse1
- Direction
- increasede1
- Value
- 13.2, 13.6, and 14.1 Mg ha −1e1
- Comparator
- earlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Milk per megagram, a forage quality index, declined (1523, 1487, and 1417 kg Mg −1 ), but DM yields increased (13.2, 13.6, and 14.1 Mg ha −1 ), so calculated milk yields were similar (20333, 20200, and 20233 kg ha −1 ) at early, medium, and late harvest dates, respectively”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
Calculated milk yields were similar (20333, 20200 and 20233 kg ha-1) at early, medium and late harvest dates.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- harvest datese1
- Outcome
- calculated milk yieldse1
- Direction
- similare1
- Value
- 20333, 20200, and 20233 kg ha −1e1
- Comparator
- earlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Milk per megagram, a forage quality index, declined (1523, 1487, and 1417 kg Mg −1 ), but DM yields increased (13.2, 13.6, and 14.1 Mg ha −1 ), so calculated milk yields were similar (20333, 20200, and 20233 kg ha −1 ) at early, medium, and late harvest dates, respectively”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
The sharp decline in NDF digestibility raises concern about harvesting the brown midrib hybrid above 350 g kg-1 DM content.
- Taxon
- CornZea mays subsp. mayst0
- Material
- brown midrib hybride1
- Outcome
- harvesting the brown midrib hybrid above 350 g kg −1 DM contente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The sharp decline in NDF digestibility, however, raises concern about harvesting the brown midrib hybrid above 350 g kg −1 DM content”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
Calculated milk yield of the leafy hybrid showed no change as cutting height increased from 15 to 46 cm.
- Taxon
- CornZea mays subsp. mayst0
- Material
- leafy hybride1
- Treatment
- cutting height increased from 15 to 46 cme1
- Outcome
- Calculated milk yielde1
- Direction
- no changee1
- Comparator
- 15e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Calculated milk yield had a hybrid × cutting height interaction, as indicated by no change in the leafy hybrid and a 13% decrease in the brown midrib hybrid as cutting height increased from 15 to 46 cm”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
Calculated milk yield of the brown midrib hybrid decreased by 13% as cutting height increased from 15 to 46 cm.
- Taxon
- CornZea mays subsp. mayst0
- Material
- brown midrib hybride1
- Treatment
- cutting height increased from 15 to 46 cme1
- Outcome
- Calculated milk yielde1
- Direction
- decreasee1
- Value
- 13%e1
- Comparator
- 15e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Calculated milk yield had a hybrid × cutting height interaction, as indicated by no change in the leafy hybrid and a 13% decrease in the brown midrib hybrid as cutting height increased from 15 to 46 cm”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
An increase in cutting height may be a good management practice for the leafy hybrid.
- Taxon
- CornZea mays subsp. mayst0
- Material
- leafy hybride1
- Outcome
- increase in cutting height may be a good management practicee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“an increase in cutting height may be a good management practice for the leafy hybrid but not for the brown midrib hybrid”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
Claim · model-written summary
An increase in cutting height may not be a good management practice for the brown midrib hybrid.
- Taxon
- CornZea mays subsp. mayst0
- Material
- brown midrib hybride1
- Outcome
- good management practicee1
- Qualifier
- but not for the brown midrib hybride1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“an increase in cutting height may be a good management practice for the leafy hybrid but not for the brown midrib hybrid”
t0“Hybrid, Maturity, and Cutting Height Interactions on Corn Forage Yield and Quality”
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