Abstract
Abstract The combined long‐term effects of tillage method and crop rotation on crop yield have not been studied in rainfed systems under Mediterranean climates. A field study was conducted from 1988 to 1994 to determine the effects of tillage (TILL), crop rotation and (ROT) N fertilizer on wheat ( Triticum aestivum L.) yield in a rainfed Mediterranean region. Tillage treatments include no tillage (NT) and conventional tillage (CT). Crop rotations were wheat‐sunflower ( Helianthus annuus L.) (WS), wheat‐chickpea ( Cicer arietinum L.) (WCP), wheatfababean ( Vicia faba L.) (WFB), wheat‐fallow (WF), and continuous wheat (CW), with N fertilizer rates of 50, 100, and 150 kg N ha −1 . A split‐split plot design with four replications was used. Differences in rainfall during the growing season had a marked effect on wheat yield. Amount of rainfall during the vegetative period for wheat (November‐February) was highly correlated with yield because of the high water‐retention capacity of Vertisols (Typic Haploxerert). In dry years, wheat yield was greater under NT than under CT; the opposite was true in wet years. The TILL ✕ ROT interaction was also significant in the drought years; the wheat yield under NT was greater for CW and the WFB and WF rotations than under CT. Wheat yields ranked by crop rotation were: WFB > WF >> WCP > WS >> CW. Wheat did not respond to N fertilizer when rainfall was below 450 mm during the growing season. Using these results strategies can be developed for establishing the N fertilizer rate applied to wheat as a function of rainfall, the preceding crop, and residual N in soil in order to optimize wheat yield and reduce nitrate pollution to groundwater.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 10
Claim · model-written summary
Growing-season rainfall differences had a marked effect on wheat yield.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- wheat yielde0
- Qualifier
- marked effecte0
- Setting
- growing seasone0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Differences in rainfall during the growing season had a marked effect on wheat yield”
Claim · model-written summary
Vegetative-period rainfall was highly correlated with wheat yield.
- Taxon
- wheatTriticum aestivume0
- Outcome
- yielde0
- Qualifier
- highly correlatede0
- Setting
- November‐Februarye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Amount of rainfall during the vegetative period for wheat (November‐February) was highly correlated with yield”
Claim · model-written summary
No tillage produced greater wheat yield than conventional tillage in dry years.
- Taxon
- wheatTriticum aestivume0
- Treatment
- NTe0
- Outcome
- wheat yielde0
- Direction
- greatere0
- Qualifier
- dry yearse0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In dry years, wheat yield was greater under NT than under CT”
Claim · model-written summary
Conventional tillage produced greater wheat yield than no tillage in wet years.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- CTe1
- Outcome
- wheat yielde1
- Direction
- higherinferrede0
- Qualifier
- wet yearse0
- Comparator
- NTe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the opposite was true in wet years”
t0“Wheat Yield”
e1“In dry years, wheat yield was greater under NT than under CT”
Claim · model-written summary
Tillage by rotation interaction was significant in drought years.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- TILL ✕ ROTe0
- Outcome
- Wheat Yieldt0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The TILL ✕ ROT interaction was also significant in the drought years”
t0“Wheat Yield”
Claim · model-written summary
Under continuous wheat, no tillage gave greater yield than conventional tillage in drought years.
- Taxon
- wheatTriticum aestivume0
- Material
- CWe0
- Treatment
- NTe0
- Outcome
- wheat yielde0
- Direction
- greatere0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat yield under NT was greater for CW and the WFB and WF rotations than under CT”
Claim · model-written summary
Under wheat-fababean rotation, no tillage gave greater yield than conventional tillage in drought years.
- Taxon
- wheatTriticum aestivume0
- Material
- WFBe0
- Treatment
- NTe0
- Outcome
- wheat yielde0
- Direction
- greatere0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat yield under NT was greater for CW and the WFB and WF rotations than under CT”
Claim · model-written summary
Under wheat-fallow rotation, no tillage gave greater yield than conventional tillage in drought years.
- Taxon
- wheatTriticum aestivume0
- Material
- WFe0
- Treatment
- NTe0
- Outcome
- wheat yielde0
- Direction
- greatere0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat yield under NT was greater for CW and the WFB and WF rotations than under CT”
Claim · model-written summary
Wheat yields ranked WFB above WF, WCP, WS and CW.
- Taxon
- WheatTriticum aestivume0
- Outcome
- yieldse0
- Direction
- rankede0
- Qualifier
- WFB > WF >> WCP > WS >> CWe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat yields ranked by crop rotation were: WFB > WF >> WCP > WS >> CW”
Claim · model-written summary
Wheat did not respond to nitrogen fertilizer when growing-season rainfall was below 450 mm.
- Taxon
- WheatTriticum aestivume0
- Treatment
- N fertilizere0
- Outcome
- responde0
- Direction
- did not responde0
- Qualifier
- below 450 mme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat did not respond to N fertilizer when rainfall was below 450 mm during the growing season”
The same questions in other papers
tillage · yield · Triticum aestivum (wheat)Positive and negative results
1,115 papers in the same direction as this paper · 257 in the opposite direction · 41 reporting no difference from an alternative
- negative
- no effect
- no effect
1,410 papers more in this group
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.