Abstract
This study was conducted to investigate the effect of rotary tillage on some soil physical properties (bulk density, cone index, plasticity index, aggregate uniformity coefficient) and organic matter, and to develop and evaluate a soil tilth index based on changes of these soil properties. The tillage treatments were 4 x 3 factorial combinations of forward speeds obtained with four selected tractor transmission gears (Gear 1 High, Gear 2 Low, Gear 3 Low and Gear 4 Low), and three rotary tilling speeds (140 rpm, 175 rpm and 200 rpm) of commonly used tillage implements in Malaysian paddy fields. Experimental results indicated a significant decrease in bulk density of the soil due to rotary tillage. The other soil parameters were not significantly affected by the tillage operation. Analysis of variance indicated significant difference (p<0.01) among the rice yield means. Bulk density was identified to have a high positive correlation with the rice yield. A tilth index consequently developed with bulk density, cone index and plasticity index gave better predictability (r 2 = 0.56) of rice yield than when individual soil properties were considered. Results of the study suggest that tilth index may assist in yield prediction by comparing measured soil conditions in a paddy field.
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Claims 5
Claim · model-written summary
Rotary tillage significantly decreased soil bulk density in rice paddy fields.
- Taxon
- rice
Oryza sativae0 - Treatment
- rotary tillagee1
- Outcome
- bulk densitye1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of variance indicated significant difference (p<0.01) among the rice yield means”
e1“Experimental results indicated a significant decrease in bulk density of the soil due to rotary tillage”
Claim · model-written summary
Other soil physical parameters were not significantly affected by the tillage operation.
- Taxon
- riceOryza sativae0
- Treatment
- tillage operatione1
- Outcome
- other soil parameterse1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of variance indicated significant difference (p<0.01) among the rice yield means”
e1“The other soil parameters were not significantly affected by the tillage operation”
Claim · model-written summary
Rice yield differed significantly among the tillage treatments.
- Taxon
- riceOryza sativae0
- Outcome
- rice yielde0
- Qualifier
- p<0.01e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Analysis of variance indicated significant difference (p<0.01) among the rice yield means”
Claim · model-written summary
Bulk density was highly and positively correlated with rice yield.
- Taxon
- riceOryza sativae2
- Treatment
- bulk densitye2
- Outcome
- rice yielde2
- Direction
- increaseinferrede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Bulk density was identified to have a high positive correlation with the rice yield”
Claim · model-written summary
A tilth index built from bulk density, cone index and plasticity index predicted rice yield better (r 2 = 0.56) than individual soil properties.
- Taxon
- riceOryza sativae3
- Outcome
- predictabilitye3
- Value
- r 2 = 0.56e3
- Comparator
- individual soil propertiese3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“A tilth index consequently developed with bulk density, cone index and plasticity index gave better predictability (r 2 = 0.56) of rice yield than when individual soil properties were considered”