Abstract
ABSTRACT No tillage or zero tillage (NT) is the extreme form of reduced tillage; NT with residue retention is a main component of conservation agriculture. Using a literature survey and meta‐analysis, this study aimed to (i) summarize the results of studies comparing the grain yield of wheat [ Triticum aestivum L. and Triticum turgidum L. subsp. durum (Desf.) Husn. (syn. Triticum durum Desf.)] and maize ( Zea mays L.) genotypes under contrasting tillage, (ii) identify sources of variation in the grain yield response of wheat and maize genotypes to tillage practices, and (iii) identify potential traits for NT breeding programs. Grain yield was compared under NT and conventional tillage (CT) for 112 wheat genotypes (44 spring, 60 winter, and eight durum wheat genotypes) across 12 locations and 24 yr and for 93 maize hybrids across six locations and 5 yr. Most of these studies showed slightly higher grain yields under CT for maize (+5%) and winter (+5%) and spring (+2%) wheat. In the few studies where selection had been conducted under NT, the effect of tillage on the grain yield was modified significantly by genotypes. Traits associated with the emergence of vigorous seedlings and resistance to a changed spectrum of diseases increase genotype performance under NT. There is a need to evaluate genotypes developed under NT and extend the research on genotype performance under NT to locations with reduced input use and, in addition to tillage, investigate other factors that differentiate conservation agriculture from conventional practice.
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Claims 6
Claim · model-written summary
Maize grain yield was slightly higher under conventional tillage than under no tillage (+5%) in most studies.
- Treatment
- conventional tillage (CT)e2
- Outcome
- grain yieldse1
- Direction
- highere1
- Value
- +5%e1
- Qualifier
- Most of these studiese1
- Comparator
- NTe2
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Most of these studies showed slightly higher grain yields under CT for maize (+5%) and winter (+5%) and spring (+2%) wheat”
e2“Grain yield was compared under NT and conventional tillage (CT)”
Claim · model-written summary
Spring wheat grain yield was slightly higher under conventional tillage than under no tillage (+2%) in most studies.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- conventional tillage (CT)e2
- Outcome
- grain yieldse1
- Direction
- highere1
- Value
- +2%e1
- Qualifier
- springe1
- Comparator
- NTe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Most of these studies showed slightly higher grain yields under CT for maize (+5%) and winter (+5%) and spring (+2%) wheat”
e2“Grain yield was compared under NT and conventional tillage (CT)”
Claim · model-written summary
Winter wheat grain yield was slightly higher under conventional tillage than under no tillage (+5%) in most studies.
- Taxon
- wheatTriticum aestivume1
- Treatment
- conventional tillage (CT)e2
- Outcome
- grain yieldse1
- Direction
- highere1
- Value
- +5%e1
- Qualifier
- wintere1
- Comparator
- NTe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Most of these studies showed slightly higher grain yields under CT for maize (+5%) and winter (+5%) and spring (+2%) wheat”
e2“Grain yield was compared under NT and conventional tillage (CT)”
Claim · model-written summary
The effect of tillage on wheat and maize grain yield was significantly modified by genotype.
- Taxon
- WheatTriticum aestivumt0
- Material
- genotypese4
- Treatment
- tillagee4
- Outcome
- effect of tillage on the grain yielde4
- Qualifier
- In the few studies where selection had been conducted under NTe4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects on the Grain Yield of Wheat and Maize”
e4“In the few studies where selection had been conducted under NT, the effect of tillage on the grain yield was modified significantly by genotypes”
Claim · model-written summary
Traits of vigorous seedling emergence and disease resistance increase wheat and maize genotype performance under NT.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- NTe5
- Outcome
- genotype performancee5
- Direction
- increasee5
- Qualifier
- emergence of vigorous seedlingse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects on the Grain Yield of Wheat and Maize”
e5“Traits associated with the emergence of vigorous seedlings and resistance to a changed spectrum of diseases increase genotype performance under NT”
Claim · model-written summary
Genotypes developed under NT should be evaluated, and genotype performance under NT extended to locations with reduced input use.
- Taxon
- WheatTriticum aestivumt0
- Outcome
- evaluate genotypes developed under NTe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Effects on the Grain Yield of Wheat and Maize”
e6“There is a need to evaluate genotypes developed under NT and extend the research on genotype performance under NT to locations with reduced input use”
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1,115 papers in the same direction as this paper · 257 in the opposite direction · 41 reporting no difference from an alternative
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See all 1,414 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.