Effect of conservation agriculture on soil properties and sesame yield in the sesame-wheat rotation

Document Type : Research Paper

Authors

1 Department of Agricultural Engineering Research, Fars Research and Education Center for Agriculture and Natural Resources, AREEO, Shiraz, Iran.

2 Department of Soil and Water Research, Fars Research and Education Center for Agriculture and Natural Resources, AREEO, Shiraz, Iran.

3 Department of Soil Conservation and Watershed Management Research, Fars Research and Education Center for Agriculture and Natural Resources, AREEO, Shiraz, Iran.

Abstract

Effect of conservation agriculture on soil properties and sesame yield in the sesame-wheat rotation

Introduction: Conservation tillage methods offer considerable advantages compared to the conventional tillage; therefore, these tillage methods are widely disseminated throughout the world. Conservation tillage affects soil properties, environment, and crop yield. Results of research studies show that conservation tillage saves water in wheat production compared to the conventional tillage (Erenstein & Laxmi, 2008). Conservation tillage also increases soil organic carbon (Madejon et al., 2009) and sesame yield (Uzun et al., 2012) as compared to the conventional tillage. This study was performed to evaluate the effects of conservation tillage practices on soil properties and sesame yield in sesame-wheat crop rotation under hot climatic condition of Fars province.
Materials and Methods: This study was conducted using a randomized complete block experimental design with five treatments and four replications in Fars province from 2010 to 2013. Treatments included; 1) reduced tillage (T1), 2) wheat and sesame direct seeding (T2), 3) sesame direct seeding for four years, wheat direct seeding for the first two years and the fourth year, and conventional planting in the third year (T3), 4) wheat direct seeding for four years, sesame direct seeding for the first two years and the fourth year, and conventional planting in the third year (T4), and 5) conventional tillage (T5). Soil bulk density was measured at two soil depths including 0 to 10 and 10 to 20 cm using core samplers. Soil moisture content was measured using TDR at the soil depth of 0 to 20 cm. Soil water cumulative infiltration and infiltration rate were determined using double ring method. Soil organic carbon was measured by analyzing mixed soil samples in laboratory, and carbon dioxide emission from the soil was determined in the field using Anderson method. Sesame yield was calculated by harvesting 10 m2 area of each experimental plot. Collected data were analyzed using SAS software and Duncan's multiple range tests was used to compare the treatments means.
Results and Discussion: Results of this research indicated that tillage methods had significant effect on soil moisture content so that the maximum soil moisture content was obtained from the no-till method and the conventional tillage gave the lowest soil moisture content. Tillage methods had no significant effect on soil bulk density; therefore, conservation tillage methods did not considerably increase soil compaction. Results also showed that soil cumulative infiltration and infiltration rate were affected by tillage methods in such a way that conservation tillage practices decreased soil infiltration rate compared to the conventional tillage. Conservation tillage methods also increased soil organic carbon and decreased carbon dioxide emission from the soil as compared to the conventional tillage. Meanwhile, conservation tillage methods did not significantly decrease sesame yield relative to the conventional tillage.
Conclusion: Results showed that conservation tillage methods increased soil moisture retention (at most 50%) and soil organic carbon (138%) relative to the conventional tillage. Soil bulk density was not affected by tillage methods, while conservation tillage methods reduced soil water cumulative infiltration and infiltration rate compared to the conventional tillage (33%). Conservation tillage methods reduced carbon dioxide emission from the soil by 19%. Meanwhile, conservation tillage methods did not reduce sesame yield compared to conventional methods.
Acknowledgments: The authors would like to acknowledge the financial support extended by the Agriculture Organization of Fars province and Agricultural Engineering Research Institute.
Keywords: Tillage methods, soil bulk density, soil moisture content, soil organic carbon, sesame, soil infiltration rate

References
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Keywords

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Applied Field Crops Research
Volume 31, Issue 3 - Serial Number 120
papers
October 2018
Pages 20-40

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