A modified soil tilth index and its relationship with rice yield
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 tilla...
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| Format: | Article |
| Language: | English English |
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2006
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| Online Access: | http://psasir.upm.edu.my/id/eprint/18317/ http://psasir.upm.edu.my/id/eprint/18317/1/A%20modified%20soil%20tilth%20index%20and%20its%20relationship%20with%20rice%20yield.pdf |
| _version_ | 1848843478358818816 |
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| author | Bockari-Gevao, Sahr Marvin Wan Ismail, Wan Ishak Yahya, Azmi Teh, Christopher Boon Sung |
| author_facet | Bockari-Gevao, Sahr Marvin Wan Ismail, Wan Ishak Yahya, Azmi Teh, Christopher Boon Sung |
| author_sort | Bockari-Gevao, Sahr Marvin |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | 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 4×3 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. |
| first_indexed | 2025-11-15T08:15:40Z |
| format | Article |
| id | upm-18317 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T08:15:40Z |
| publishDate | 2006 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-183172015-09-07T06:48:26Z http://psasir.upm.edu.my/id/eprint/18317/ A modified soil tilth index and its relationship with rice yield Bockari-Gevao, Sahr Marvin Wan Ismail, Wan Ishak Yahya, Azmi Teh, Christopher Boon Sung 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 4×3 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. 2006 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/18317/1/A%20modified%20soil%20tilth%20index%20and%20its%20relationship%20with%20rice%20yield.pdf Bockari-Gevao, Sahr Marvin and Wan Ismail, Wan Ishak and Yahya, Azmi and Teh, Christopher Boon Sung (2006) A modified soil tilth index and its relationship with rice yield. ScienceAsia, 32 (1). pp. 25-30. ISSN 1513-1874 http://dx.doi.org/10.2306/scienceasia1513-1874.2006.32.025 Crop yields - Malaysia Rice - Malaysia Soil physics - Malaysia doi:10.2306/scienceasia1513-1874.2006.32.025 English |
| spellingShingle | Crop yields - Malaysia Rice - Malaysia Soil physics - Malaysia Bockari-Gevao, Sahr Marvin Wan Ismail, Wan Ishak Yahya, Azmi Teh, Christopher Boon Sung A modified soil tilth index and its relationship with rice yield |
| title | A modified soil tilth index and its relationship with rice yield |
| title_full | A modified soil tilth index and its relationship with rice yield |
| title_fullStr | A modified soil tilth index and its relationship with rice yield |
| title_full_unstemmed | A modified soil tilth index and its relationship with rice yield |
| title_short | A modified soil tilth index and its relationship with rice yield |
| title_sort | modified soil tilth index and its relationship with rice yield |
| topic | Crop yields - Malaysia Rice - Malaysia Soil physics - Malaysia |
| url | http://psasir.upm.edu.my/id/eprint/18317/ http://psasir.upm.edu.my/id/eprint/18317/ http://psasir.upm.edu.my/id/eprint/18317/ http://psasir.upm.edu.my/id/eprint/18317/1/A%20modified%20soil%20tilth%20index%20and%20its%20relationship%20with%20rice%20yield.pdf |