Abstract
When the rate of dry‐matter production of a grass crop is determined only by the incoming light energy, it increases exponentially until a closed green surface is reached. Thereafter the production is linear for some time, but soon it decreases and finally drops to zero. This decrease is partly caused by an increase in the rate of respiration relative to photosynthesis. However, there are still unknown factors affecting the rate of production, especially in the second half of the season. When a sward receives an optimal supply of water and nutrients the organic plant constituents at a given growth stage remain fairly constant throughout the season. It would be advantageous, however, to harvest grass with a higher sugar and a lower protein content. This seems to give better rumen digestion and, besides, would improve the regrowth of the sward. Since plants with a high rate of dry‐matter production usually have a fairly low reserve level, it is unlikely that selection could provide a strain with both a high reserve level and a high rate of production.
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Claims 7
Claim · model-written summary
Light-limited grass dry matter production rises exponentially until canopy closure.
Verbatim
e0“the rate of dry‐matter production of a grass crop is determined only by the incoming light energy, it increases exponentially until a closed green surface is reached”
Claim · model-written summary
After canopy closure, grass production is linear for a time.
Not reportedDirection
Verbatim
e0“Thereafter the production is linear for some time”
t0“SWARD”
e2“the rate of dry‐matter production of a grass crop”
Claim · model-written summary
Grass production subsequently decreases and reaches zero.
Verbatim
e0“but soon it decreases and finally drops to zero”
e1“the rate of dry‐matter production of a grass crop”
t0“SWARD”
e2“the rate of dry‐matter production of a grass crop”
Claim · model-written summary
Increasing respiration relative to photosynthesis partly explains declining grass production.
Verbatim
e0“This decrease is partly caused by an increase in the rate of respiration relative to photosynthesis.”
e1“This decrease is partly caused by an increase in the rate of respiration relative to photosynthesis.”
t0“SWARD”
e2“the rate of dry‐matter production of a grass crop”
Claim · model-written summary
Grass organic constituents remain fairly constant across the season under optimal water and nutrients at a given growth stage.
Verbatim
e0“When a sward receives an optimal supply of water and nutrients the organic plant constituents at a given growth stage remain fairly constant throughout the season.”
Claim · model-written summary
Harvesting grass with higher sugar and lower protein is proposed to improve rumen digestion and sward regrowth.
Verbatim
e0“harvest grass with a higher sugar and a lower protein content. This seems to give better rumen digestion and, besides, would improve the regrowth of the sward.”
Claim · model-written summary
Selection is considered unlikely to combine high reserve level with high production rate in one strain.
Verbatim
e0“it is unlikely that selection could provide a strain with both a high reserve level and a high rate of production”
t0“SWARD”
e2“the rate of dry‐matter production of a grass crop”