Abstract
Long-term yields, nitrogen uptake and responsiveness of grain sorghum following three lucerne rotations, an annual legume rotation, long fallowing, and continuous wheat growing were measured on a black earth and red clay in northern New South Wales. The three lucerne rotations compared two methods of lucerne establishment (with or without a cover crop) and two methods of grazing management (short or extended grazing).There were large beneficial effects of lucerne leys on the first grain sorghum crop, whether they were measured as grain yield, nitrogen content of the foliage and grain, or nitrogen uptake. The effect was much smaller in the second year but it increased in the third and fourth years, in direct relation to the rainfall during the sorghum flowering period. The effect was larger on the black earth than on the red clay, reflecting the much higher lucerne yields on the former soil. Evidence indicated that the nitrogen contribution from lucerne after the first year was no greater than the nitrogen accumulated by long fallowing, and this was attributed to very low rainfall and lucerne yields during the four year ley period.The annual legume rotation suffered from drought and insect damage in most years, and following sorghum yields tended to be lower than those achieved by long fallowing.Differences in the effects of establishment method and grazing management on total lucerne yields were reflected in the differences in subsequent grain sorghum yields. Largest differences were on the black earth where extended grazing lowered the total yields of lucerne and subsequent grain sorghum. Sowing lucerne under wheat had little effect on total yields of lucerne or sorghum.
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Claims 9
Claim · model-written summary
Lucerne leys increased first-crop sorghum grain yield.
- Taxon
- grain sorghum
Sorghum bicolore0 - Treatment
- lucerne leyse0
- Outcome
- grain yielde0
- Direction
- beneficiale0
- Comparator
- first grain sorghum crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“large beneficial effects of lucerne leys on the first grain sorghum crop, whether they were measured as grain yield, nitrogen content of the foliage and grain, or nitrogen uptake”
Claim · model-written summary
Lucerne leys increased sorghum foliage and grain nitrogen content.
- Taxon
- grain sorghumSorghum bicolore0
- Treatment
- lucerne leyse0
- Outcome
- nitrogen content of the foliage and graine0
- Direction
- beneficiale0
- Comparator
- first grain sorghum crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“large beneficial effects of lucerne leys on the first grain sorghum crop, whether they were measured as grain yield, nitrogen content of the foliage and grain, or nitrogen uptake”
Claim · model-written summary
Lucerne leys increased first-crop sorghum nitrogen uptake.
- Taxon
- grain sorghumSorghum bicolore0
- Treatment
- lucerne leyse0
- Outcome
- nitrogen uptakee0
- Direction
- beneficiale0
- Comparator
- first grain sorghum crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“large beneficial effects of lucerne leys on the first grain sorghum crop, whether they were measured as grain yield, nitrogen content of the foliage and grain, or nitrogen uptake”
Claim · model-written summary
Lucerne rotation effect was smaller in year two and increased in years three and four with flowering rainfall.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect was much smaller in the second year but it increased in the third and fourth years, in direct relation to the rainfall during the sorghum flowering period”
Claim · model-written summary
Lucerne rotation effect was larger on black earth than red clay.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect was larger on the black earth than on the red clay”
e1“subsequent grain sorghum yields”
Claim · model-written summary
Lucerne nitrogen contribution after year one was no greater than long fallowing.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen contribution from lucerne after the first year was no greater than the nitrogen accumulated by long fallowing”
e1“following sorghum yields”
Claim · model-written summary
Sorghum after annual legume tended to yield less than after long fallow.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“following sorghum yields tended to be lower than those achieved by long fallowing”
Claim · model-written summary
Extended grazing lowered lucerne and subsequent sorghum yields on black earth.
- Taxon
- grain sorghumSorghum bicolore0
- Treatment
- extended grazinge0
- Outcome
- subsequent grain sorghume0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extended grazing lowered the total yields of lucerne and subsequent grain sorghum”
Claim · model-written summary
Sowing lucerne under wheat had little effect on lucerne or sorghum yields.
- Treatment
- Sowing lucerne under wheate0
- Outcome
- total yields of lucerne or sorghume0
- Direction
- little effecte0
- Comparator
- wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sowing lucerne under wheat had little effect on total yields of lucerne or sorghum”
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Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.