Abstract
Rotations of barley with feed legumes produce more biomass and crude protein than barley-fallow and continuous barley sequences, but scope remains to improve the potential value to farmers of feed legume-based systems. This paper summarizes 6-year results from two sites from 2-year rotations of barley with: narbon vetch ( Vicia narbonensis ) and lathyrus ( Lathyrus sativus ), each harvested mature; and common vetch ( Vicia sativa ), harvested by simulated green-grazing and mature, all in factorial combination with four NP fertilizer regimes applied biennially to the barley. Mean yield differences between rotations were quite small, but at the drier site the narbon vetch rotation was significantly superior in both total biomass and crop total nitrogen. Other results implied yield compensation between barley and legume phases: barley performance was relatively depressed at the wetter site after high-yielding narbon vetch but was relatively enhanced at both sites after green-grazed common vetch. Evidence from year-round soil-water monitoring suggests that the benefit following green grazing may have arisen, in part, from a small carry-over of profile moisture between crops not much inferior to that residual from a fallow year. Both crop phases responded strongly to biennial P fertilizer; and barley responded strongly to three rates of N-fertilizer, but a sometimes significant curvilinear component to this response reflected a tendency for grain yields to be depressed by added nitrogen in the driest years. But interactions between N-rates and rotations were not significant. It was concluded that narbon vetch may have greater potential than common vetch and lathyrus for mature harvest in drier areas, but its unsuitability for grazing green is a limitation. Flexibility of utilization is important, to accommodate the needs of different farmers and the exigencies of different seasons. The green-graze option has major potential where there is a demand for high-quality spring grazing; and indications that barley may be as productive after green-grazed vetch as after a year of fallow suggest an alternative approach for farmers who have previously avoided legumes in order to maximize barley production.
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Claims 9
Claim · model-written summary
At the drier site the narbon vetch rotation had greater total biomass than other rotations.
- Taxon
- narbon vetche0
- Treatment
- narbon vetch rotatione0
- Outcome
- total biomasse0
- Direction
- superiore0
- Setting
- drier sitee0
Not reportedComparator
Verbatim
e0“at the drier site the narbon vetch rotation was significantly superior in both total biomass and crop total nitrogen”
Claim · model-written summary
At the drier site the narbon vetch rotation had greater crop total nitrogen.
- Taxon
- narbon vetche0
- Treatment
- narbon vetch rotatione0
- Outcome
- crop total nitrogene0
- Direction
- superiore0
- Setting
- drier sitee0
Not reportedComparator
Verbatim
e0“at the drier site the narbon vetch rotation was significantly superior in both total biomass and crop total nitrogen”
Claim · model-written summary
Barley performance was relatively depressed at the wetter site after high-yielding narbon vetch.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- high-yielding narbon vetche0
- Outcome
- barley performancee0
- Direction
- depressede0
- Setting
- wetter sitee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“barley performance was relatively depressed at the wetter site after high-yielding narbon vetch”
Claim · model-written summary
Both crop phases responded strongly to biennial phosphorus fertilizer.
Not reportedComparatorDirection
Verbatim
e0“Both crop phases responded strongly to biennial P fertilizer”
Claim · model-written summary
Barley responded strongly to three rates of nitrogen fertilizer.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- three rates of N-fertilizere0
- Outcome
- barleye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley responded strongly to three rates of N-fertilizer”
Claim · model-written summary
Added nitrogen tended to depress barley grain yield in the driest years.
Not reportedTaxonComparator
Verbatim
e0“grain yields to be depressed by added nitrogen in the driest years”
Claim · model-written summary
Interactions between nitrogen rates and rotations were not significant.
Not reportedTaxonDirection
Verbatim
e0“interactions between N-rates and rotations were not significant”
Claim · model-written summary
Narbon vetch may have greater potential than common vetch and lathyrus for mature harvest in drier areas.
Verbatim
e0“narbon vetch may have greater potential than common vetch and lathyrus for mature harvest in drier areas”
Claim · model-written summary
Green-grazed vetch may offer an alternative to fallow while sustaining barley productivity.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- green-grazed vetche0
- Outcome
- as productivee0
- Comparator
- a year of fallowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley may be as productive after green-grazed vetch as after a year of fallow”
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See all 299 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.