Abstract
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 (r2 = 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 6
Claim · model-written summary
Rotary tillage significantly decreased soil bulk density.
- Taxon
- Rice
Oryza sativat0 - Treatment
- rotary tillagee0
- Outcome
- bulk density of the soile0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Yield”
e0“significant decrease in bulk density of the soil due to rotary tillage”
Claim · model-written summary
Other soil parameters were not significantly affected by tillage.
- Taxon
- RiceOryza sativat0
- Treatment
- tillage operatione0
- Outcome
- other soil parameterse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Rice Yield”
e0“The other soil parameters were not significantly affected by the tillage operation”
Claim · model-written summary
Rice yield means differed significantly.
- Taxon
- riceOryza sativae0
- Outcome
- rice yield meanse0
- Value
- p<0.01e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant difference (p<0.01) among the rice yield means”
Claim · model-written summary
Soil bulk density was highly positively correlated with rice yield.
- Taxon
- riceOryza sativae0
- Outcome
- rice yielde0
- Direction
- positivee0
- Comparator
- Bulk densitye0
Not reportedCompoundSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bulk density was identified to have a high positive correlation with the rice yield”
Claim · model-written summary
The tilth index predicted rice yield better than individual soil properties, with r2 = 0.56.
- Taxon
- riceOryza sativae0
- Outcome
- predictabilitye0
- Direction
- bettere0
- Value
- r2 = 0.56e0
- Comparator
- individual soil propertiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A tilth index consequently developed with bulk density, cone index and plasticity index gave better predictability (r2 = 0.56) of rice yield than when individual soil properties were considered”
Claim · model-written summary
The tilth index may assist yield prediction by comparing measured paddy field conditions.
- Taxon
- RiceOryza sativat0
- Outcome
- yield predictione0
- Setting
- paddy fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tilth index may assist in yield prediction by comparing measured soil conditions in a paddy field”
t0“Rice Yield”