Abstract
The beneficial effects of crop rotation have long been researched and recognised in the world. Research results on crop rotation in South Africa are limited. The objective of this study was to determine the effect of crop rotation with groundnut, soyabean or sunflower on the yield and yield variability of first and second year maize and sorgbum on a sandy soil in the north western Free State. The 7-year and 4-year study for maize and sorghum respectively, was managed for optimal production. The yield of first year maize after groundnut was 16% and after soyabean 12% higher than the yield of monocropped maize, while the yield of maize after sunflower was unaffected. The yield of second year maize was unaffected by crop rotation. Yield variability was slightly higher for first year maize (coefficient of variation = 54%) than for the second year and monocropped maize (coefficient of variation = 46%). However, the probability of obtaining a yield below a disaster target level with first year maize, is equal to or less than that of monocropped maize depending on the level of the disaster target yield. First year sorghum yields were unaffected by crop rotation. The yield of second year sorghum after groundnut and sunflower was lower than that of first year and monocropped sorghum. Yield variability for second year sorghum was also slightly higher than that of the first year and monocropped sorghum. Groundnut yield was higher after maize than after sorghum, while soyabean yield was higher after sorghum than after maize. The yield of sunflower was unaffected by crop rotation although the yield variability was higher after sorghum than after maize.
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Claims 14
Claim · model-written summary
First year maize yield after groundnut was 16% higher than monocropped maize.
- Treatment
- groundnute0
- Outcome
- yield of first year maizee0
- Direction
- highere0
- Value
- 16%e0
- Comparator
- monocropped maizee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of first year maize after groundnut was 16% and after soyabean 12% higher than the yield of monocropped maize, while the yield of maize after sunflower was unaffected.”
Claim · model-written summary
First year maize yield after soyabean was 12% higher than monocropped maize.
- Treatment
- soyabeane0
- Outcome
- yield of first year maizee0
- Direction
- highere0
- Value
- 12%e0
- Comparator
- monocropped maizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of first year maize after groundnut was 16% and after soyabean 12% higher than the yield of monocropped maize, while the yield of maize after sunflower was unaffected.”
Claim · model-written summary
First year maize yield after sunflower was unaffected.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of first year maize after groundnut was 16% and after soyabean 12% higher than the yield of monocropped maize, while the yield of maize after sunflower was unaffected.”
Claim · model-written summary
Second year maize yield was unaffected by crop rotation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of second year maize was unaffected by crop rotation.”
Claim · model-written summary
Yield variability was slightly higher for first year maize than second year and monocropped maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield variability was slightly higher for first year maize (coefficient of variation = 54%) than for the second year and monocropped maize (coefficient of variation = 46%).”
Claim · model-written summary
First year maize had an equal or lower probability of yield below a disaster threshold relative to monocropped maize, depending on threshold.
- Outcome
- probability of obtaining a yield below a disaster target levele0
- Direction
- equal to or less thane0
- Comparator
- monocropped maizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the probability of obtaining a yield below a disaster target level with first year maize, is equal to or less than that of monocropped maize depending on the level of the disaster target yield.”
Claim · model-written summary
First year sorghum yields were unaffected by crop rotation.
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“First year sorghum yields were unaffected by crop rotation.”
Claim · model-written summary
Second year sorghum yield after groundnut was lower than first year and monocropped sorghum.
- Treatment
- groundnute0
- Outcome
- yield of second year sorghume0
- Direction
- lowere0
- Comparator
- first year and monocropped sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of second year sorghum after groundnut and sunflower was lower than that of first year and monocropped sorghum.”
Claim · model-written summary
Second year sorghum yield after sunflower was lower than first year and monocropped sorghum.
- Treatment
- sunflowere0
- Outcome
- yield of second year sorghume0
- Direction
- lowere0
- Comparator
- first year and monocropped sorghume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of second year sorghum after groundnut and sunflower was lower than that of first year and monocropped sorghum.”
Claim · model-written summary
Second year sorghum yield variability was slightly higher than first year and monocropped sorghum.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield variability for second year sorghum was also slightly higher than that of the first year and monocropped sorghum.”
Claim · model-written summary
Groundnut yield was higher after maize than after sorghum.
Arachis hypogaeaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Groundnut yield was higher after maize than after sorghum”
Claim · model-written summary
Soyabean yield was higher after sorghum than after maize.
Verbatim
e0“soyabean yield was higher after sorghum than after maize”
Claim · model-written summary
Sunflower yield was unaffected by crop rotation.
- Taxon
- sunflower
Helianthus annuuse0 - Treatment
- crop rotatione0
- Outcome
- yield of sunflowere0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of sunflower was unaffected by crop rotation although the yield variability was higher after sorghum than after maize.”
Claim · model-written summary
Sunflower yield variability was higher after sorghum than after maize.
- Taxon
- sunflowerHelianthus annuuse0
- Treatment
- sorghume0
- Outcome
- yield variabilitye0
- Direction
- highere0
- Comparator
- maizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The yield of sunflower was unaffected by crop rotation although the yield variability was higher after sorghum than after maize.”
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See all 322 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.