Abstract
The long-term effects of varying durations of lucerne Icy, extended fallowing, and continuous wheat growing on the growth, yield, and nitrogen uptake of subsequent wheat crops were determined on two contrasting soils in northern New South Wales. Durations of lucerne ley were 3+, 2+ and 1+ years on a black earth and 5+, 3+ and 1+ years on a red-brown earth. With the exception of the first wheat crop, wheat production for several years following lucerne exceeded that following extended fallow or continuous wheat growing, whether measured as vegetative yield at anthesis, grain yield, nitrogen uptake, or grain protein. The beneficial effects of lucerne on vegetative yield, nitrogen uptake, and grain protein reached a maximum in the second crop after lucerne, and the effects of 2+ or more years of lucerne remained significant for the next five crops on the black earth and the next two crops on the red-brown earth. Grain yields fluctuated widely with season, the magnitude of the lucerne effect being much more dependent on rainfall, but the duration of the effect was similar for grain and vegetative parameters. The shorter duration of the lucerne effect on the red-brown earth appeared to be associated with its more freely draining nature and consequent loss of accumulated nitrogen. The optimum duration of lucerne for maintaining nitrogen-dependent wheat yields was 3+ years on both soil types. It eliminated the need for nitrogen fertilizer for the following five wheat crops on the black earth and three wheat crops on the red-brown earth. Extended fallowing also had a beneficial effect on all parameters, particularly in the first and second crops after the fallow ended. Its effect was generally significantly smaller than the lucerne effect except in the first crop after fallow.
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Claims 9
Claim · model-written summary
Wheat after lucerne exceeded fallow or continuous wheat in vegetative and grain yield, nitrogen uptake and grain protein, apart from the first crop.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- following lucernee0
- Outcome
- vegetative yield at anthesis, grain yield, nitrogen uptake, or grain proteine0
- Direction
- exceedede0
- Comparator
- following extended fallow or continuous wheat growinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the exception of the first wheat crop, wheat production for several years following lucerne exceeded that following extended fallow or continuous wheat growing, whether measured as vegetative yield at anthesis, grain yield, nitrogen uptake, or grain protein”
Claim · model-written summary
Lucerne benefits to vegetative yield, nitrogen uptake and grain protein peaked in the second wheat crop.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- vegetative yield, nitrogen uptake, and grain proteine0
- Direction
- maximume0
- Qualifier
- second crop after lucernee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The beneficial effects of lucerne on vegetative yield, nitrogen uptake, and grain protein reached a maximum in the second crop after lucerne”
t0“wheat”
Claim · model-written summary
Effects of at least two years of lucerne remained significant for five wheat crops on black earth.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- effects of 2+ or more years of lucernee0
- Value
- five cropse0
- Setting
- black earthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of 2+ or more years of lucerne remained significant for the next five crops on the black earth”
t0“wheat”
Claim · model-written summary
Effects of at least two years of lucerne remained significant for two wheat crops on red-brown earth.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- effects of 2+ or more years of lucernee0
- Value
- two cropse0
- Setting
- red-brown earthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effects of 2+ or more years of lucerne remained significant for the next five crops on the black earth and the next two crops on the red-brown earth”
t0“wheat”
Claim · model-written summary
Lucerne effects on grain yield depended strongly on rainfall.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- magnitude of the lucerne effecte0
- Setting
- rainfalle0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields fluctuated widely with season, the magnitude of the lucerne effect being much more dependent on rainfall”
t0“wheat”
Claim · model-written summary
Three or more years of lucerne was optimal for nitrogen-dependent wheat yield on both soils.
- Taxon
- wheatTriticum aestivume0
- Outcome
- optimum duration of lucerne for maintaining nitrogen-dependent wheat yieldse0
- Value
- 3+ yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The optimum duration of lucerne for maintaining nitrogen-dependent wheat yields was 3+ years on both soil types”
Claim · model-written summary
Lucerne eliminated nitrogen fertilizer need for five later wheat crops on black earth.
- Taxon
- wheatTriticum aestivume0
- Outcome
- need for nitrogen fertilizere0
- Value
- five wheat cropse0
- Setting
- black earthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It eliminated the need for nitrogen fertilizer for the following five wheat crops on the black earth”
Claim · model-written summary
Lucerne eliminated nitrogen fertilizer need for three later wheat crops on red-brown earth.
- Taxon
- wheatTriticum aestivume0
- Outcome
- need for nitrogen fertilizere0
- Value
- three wheat cropse0
- Setting
- red-brown earthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It eliminated the need for nitrogen fertilizer for the following five wheat crops on the black earth and three wheat crops on the red-brown earth”
Claim · model-written summary
Extended fallow benefited wheat parameters, especially in the first two later crops, but less than lucerne generally.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- beneficial effect on all parameterse0
- Comparator
- lucerne effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extended fallowing also had a beneficial effect on all parameters, particularly in the first and second crops after the fallow ended. Its effect was generally significantly smaller than the lucerne effect except in the first crop after fallow”
t0“wheat”
The same questions in other papers
Medicago sativa · quality: protein · Triticum aestivum (wheat)Results agree
6 papers in the same direction as this paper
- positive
- positive
- positive
3 papers more in this group
See all 7 papers →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.