Abstract
The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study. Treatments studied were all possible combinations of five planting dates, spaced at 2-weekly intervals from late April to mid-June, and three harvest dates (mid-September, early and mid-October). Between early May and mid-June, each 1-day delay in seeding resulted, on average, in a 1% reduction in whole-plant digestible dry matter yield. In vitro dry matter digestibility was not significantly affected by date of harvesting but was reduced progressively from 66 to 63% as the date of planting was delayed. Although grain content varied from 0 to 50% of whole-plant dry matter, it had little effect on the in vitro digestibility of forage maize, which only ranged from 62 to 68%, when whole-plant dry matter contents were acceptable for direct ensiling. During the grain-filling period (450–1600 corn heat units after mid-silking), whole-plant dry matter content (%) was linearly related to accumulated corn heat units (r 2 = 0.83***); each 1% increase in dry matter content requiring an input of 40 corn heat units. Thus, using information on the date of mid-silking and daily air temperature records (long-term or current), it is possible to predict the date (average or actual) when whole-plant DM content reaches any desired magnitude for harvesting.Key words: Quality, planting date, harvest date, maize, corn, development
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Claims 8
Claim · model-written summary
Each 1-day delay in seeding between early May and mid-June reduced whole-plant digestible dry matter yield of forage maize by 1% on average.
- Taxon
- forage maizee1
- Treatment
- each 1-day delay in seedinge2
- Outcome
- whole-plant digestible dry matter yielde2
- Direction
- reductione2
- Value
- 1%e2
- Qualifier
- on averagee2
Not reportedComparator
Verbatim
e1“The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study”
e2“Between early May and mid-June, each 1-day delay in seeding resulted, on average, in a 1% reduction in whole-plant digestible dry matter yield”
Claim · model-written summary
Date of harvesting did not significantly affect in vitro dry matter digestibility of forage maize.
- Taxon
- forage maizee1
- Treatment
- date of harvestinge3
- Outcome
- In vitro dry matter digestibilitye3
- Direction
- not significantly affectede3
Not reportedComparator
Verbatim
e1“The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study”
e3“In vitro dry matter digestibility was not significantly affected by date of harvesting but was reduced progressively from 66 to 63% as the date of planting was delayed”
Claim · model-written summary
In vitro dry matter digestibility of forage maize was reduced progressively from 66 to 63% as planting was delayed.
- Taxon
- forage maizee1
- Treatment
- date of plantinge3
- Outcome
- In vitro dry matter digestibilitye3
- Direction
- reduced progressivelye3
- Value
- from 66 to 63%e3
Not reportedComparator
Verbatim
e1“The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study”
e3“In vitro dry matter digestibility was not significantly affected by date of harvesting but was reduced progressively from 66 to 63% as the date of planting was delayed”
Claim · model-written summary
Grain content had little effect on the in vitro digestibility of forage maize.
Verbatim
e4“Although grain content varied from 0 to 50% of whole-plant dry matter, it had little effect on the in vitro digestibility of forage maize, which only ranged from 62 to 68%, when whole-plant dry matter contents were acceptable for direct ensiling”
Claim · model-written summary
In vitro digestibility of forage maize ranged from 62 to 68% when whole-plant dry matter contents were acceptable for direct ensiling.
Verbatim
e4“Although grain content varied from 0 to 50% of whole-plant dry matter, it had little effect on the in vitro digestibility of forage maize, which only ranged from 62 to 68%, when whole-plant dry matter contents were acceptable for direct ensiling”
Claim · model-written summary
Whole-plant dry matter content was linearly related to accumulated corn heat units during the grain-filling period.
- Taxon
- forage maizee1
- Treatment
- accumulated corn heat unitse5
- Outcome
- whole-plant dry matter content (%)e5
- Value
- r 2 = 0.83***e5
- Qualifier
- during the grain-filling periode5
Not reportedDirection
Verbatim
e1“The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study”
e5“during the grain-filling period (450–1600 corn heat units after mid-silking), whole-plant dry matter content (%) was linearly related to accumulated corn heat units (r 2 = 0.83***)”
Claim · model-written summary
Each 1% increase in whole-plant dry matter content of forage maize required 40 corn heat units.
Verbatim
e1“The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study”
e6“each 1% increase in dry matter content requiring an input of 40 corn heat units”
Claim · model-written summary
The date when whole-plant dry matter content reaches a desired magnitude of forage maize can be predicted from mid-silking date and daily air temperature records.
- Taxon
- forage maizee1
- Treatment
- daily air temperature recordse7
- Outcome
- date (average or actual) when whole-plant DM content reaches any desired magnitudee7
Not reportedDirection
Verbatim
e1“The effects of dates of planting and harvesting on yield, quality and development of forage maize were investigated in a 3-yr study”
e7“using information on the date of mid-silking and daily air temperature records (long-term or current), it is possible to predict the date (average or actual) when whole-plant DM content reaches any desired magnitude for harvesting”
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