Abstract
The current study was carried out in Alexandria, Egypt and investigated the effect of sowing date; 1st May, 1st July, and 1st September 2017 and 2018, and age at harvest; 45, 55 and 65 days after sowing (DAS) on yield and quality of maize green forage grown with three plant densities (120, 160, and 200 kg ha–1). Sowing at 1st of May produced the highest significant amount of fresh yield (41.51 t ha–1 in average). Sowing at 1st of July resulted in the production of significantly lower yield (24.54 t ha–1 in average), however, higher dry matter content (175.99 g kg–1 in average), compared to sowing at 1st of May (143.62 g kg–1 in average). A pronounced increase in fresh yield was observed when maize was harvested at 55 DAS (30.89 t ha–1 in average) compared to harvesting at 45 DAS (22.92 t ha–1 in average). Meanwhile, the increase in fresh yield from 55 DAS to 65 DAS was non-significant. The effect of sowing date on quality parameters was greatly dependent on the age of plant at harvest. Harvesting maize green forage at 65 DAS, reflecting an advanced stage of maturity, caused a significant reduction in the crude protein (CP), and a significant increase in the neutral and acid detergent fibre fractions (NDF and ADF), resulting in a decline in the digestible organic matter (DOM). Plant density exerted non-significant influence on the fresh yield and DM content, minimal effect on the CP content, while the effect on the NDF and ADF contents was dependent on the age at harvest. The lignin content (ADL) of the herbage significantly decreased with increasing the plant density. Variations in the DOM were most dependent on the variations in CP content, followed by the variations in ADF and ADL contents. In conclusion, it is recommended to grow green forage maize twice a season on the 1st of May and 1st of July, with intermediate plant density (160 kg ha–1), and harvest it not later than 55 DAS to achieve the optimum balance between herbage productivity and nutritive value.
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Claims 14
Claim · model-written summary
May sowing produced the highest fresh yield, averaging 41.51 t ha–1.
Not reportedTaxonComparator
Verbatim
e0“Sowing at 1st of May produced the highest significant amount of fresh yield (41.51 t ha–1 in average).”
Claim · model-written summary
July sowing gave significantly lower fresh yield than May sowing, averaging 24.54 t ha–1.
- Treatment
- Sowing at 1st of Julye0
- Outcome
- yielde0
- Direction
- lowere0
- Value
- 24.54 t ha–1e0
- Comparator
- sowing at 1st of Maye0
Not reportedTaxon
Verbatim
e0“Sowing at 1st of July resulted in the production of significantly lower yield (24.54 t ha–1 in average), however, higher dry matter content (175.99 g kg–1 in average), compared to sowing at 1st of May (143.62 g kg–1 in average).”
Claim · model-written summary
July sowing gave higher dry matter content than May sowing, averaging 175.99 versus 143.62 g kg–1.
- Outcome
- dry matter contente0
- Direction
- highere0
- Value
- 175.99 g kg–1e0
- Qualifier
- 143.62 g kg–1e0
- Comparator
- sowing at 1st of Maye0
Not reportedTaxonTreatment
Verbatim
e0“higher dry matter content (175.99 g kg–1 in average), compared to sowing at 1st of May (143.62 g kg–1 in average).”
Claim · model-written summary
Harvest at 55 days after sowing increased fresh yield versus 45 days, averaging 30.89 versus 22.92 t ha–1.
- Treatment
- harvested at 55 DASe0
- Outcome
- fresh yielde0
- Direction
- increasee0
- Value
- 30.89 t ha–1e0
- Qualifier
- 22.92 t ha–1e0
- Comparator
- harvesting at 45 DASe0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A pronounced increase in fresh yield was observed when maize was harvested at 55 DAS (30.89 t ha–1 in average) compared to harvesting at 45 DAS (22.92 t ha–1 in average).”
Claim · model-written summary
Fresh yield increase from 55 to 65 days after sowing was not significant.
Not reportedTaxon
Verbatim
e0“the increase in fresh yield from 55 DAS to 65 DAS was non-significant.”
Claim · model-written summary
Harvest at 65 days after sowing significantly reduced crude protein.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvesting maize green forage at 65 DAS, reflecting an advanced stage of maturity, caused a significant reduction in the crude protein (CP),”
Claim · model-written summary
Harvest at 65 days after sowing significantly increased neutral and acid detergent fibre.
Not reportedTaxonTreatmentComparator
Verbatim
e0“a significant increase in the neutral and acid detergent fibre fractions (NDF and ADF)”
Claim · model-written summary
Harvest at 65 days after sowing decreased digestible organic matter.
Not reportedTaxonTreatmentComparator
Verbatim
e0“resulting in a decline in the digestible organic matter (DOM).”
Claim · model-written summary
Plant density had a non-significant effect on fresh yield and dry matter content.
Not reportedTaxonComparator
Verbatim
e0“Plant density exerted non-significant influence on the fresh yield and DM content”
Claim · model-written summary
Plant density had minimal effect on crude protein content.
Not reportedTaxonTreatmentComparator
Verbatim
e0“minimal effect on the CP content”
Claim · model-written summary
The effect of density on neutral and acid detergent fibre depended on harvest age.
Not reportedTaxon
Verbatim
e0“the effect on the NDF and ADF contents was dependent on the age at harvest.”
Claim · model-written summary
Herbage lignin content decreased significantly as plant density increased.
Not reportedTaxon
Verbatim
e0“The lignin content (ADL) of the herbage significantly decreased with increasing the plant density.”
Claim · model-written summary
Variation in digestible organic matter was most dependent on crude protein variation, then ADF and ADL variation.
Not reportedTaxonOrgan / stage
Verbatim
e0“Variations in the DOM were most dependent on the variations in CP content, followed by the variations in ADF and ADL contents.”
Claim · model-written summary
The authors recommend sowing maize on May 1 and July 1 at 160 kg ha–1 and harvesting by 55 days after sowing.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is recommended to grow green forage maize twice a season on the 1st of May and 1st of July, with intermediate plant density (160 kg ha–1), and harvest it not later than 55 DAS”
The same questions in other papers
density · yield · Zea mays (maize)Positive and negative results
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