Investigation of Biochar Effect on Some Physical Properties of Soil, Crop Water Stress Index and Wheat Yield in Sandy Loam Soil

Document Type : Research Paper

Authors

1 Soil science depaetment, Faculty of agriculture , Sharekord university, Shahrekord, Iran.

2 Soil Science department,, Faculty of Agriculture, Shahrkord University, Shahrekord, Iran

3 Soil science department,, faculty of agriculture , Vali-e-ِAsr Rafsanjan university, Rafsanjan.

4 Department of irrigation engineering, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran.

Abstract

Soil remediation with biochar is a new approach in crop residue management. The aim of this study was to investigate the effect of different amounts of wheat straw biochar in different particle sizes on soil air capacity (AC), macro-pores (PMAC), plant available water (PAW), Dexter index, crop water stress index (CWSI) and wheat yield in a sandy loam soil. A factorial experiment with a randomized complete block design was conducted at the East Azerbaijan Agricultural Research and Education Center (Saeidabad Station) in 2018 and 2019 in three replications. Wheat biochar with amounts of 0.5%, 1.5% and 3% and particle sizes of 0-0.5, 0.5-1 and 1-2 were mixed with soil to a depth of 15 cm. The results showed that the AC was improved by adding ​​0.5% and 1.5% biochar amount and with the particle size of 0-0.5 mm and 0.5-1 mm, respectivilly, compared to the control. The biochar with amount of 3% and the particle size of 0.5-1 mm produced the highest amount of PMAC. In all treatments, the PAW increased significantly compared to the control. Dexter index had a significant increase compared to the control, only in 0.5% and 1.5% amounts ​​with particle sizes of 0-0.5 and 0.5-1 mm respectivily. The change in biochar particle size at 0.5% and 1.5% ​​had no significant effect on dextr index. The lowest CWSI compared to the control observed in biochar amount of 1.5% and particle size of 1-2 mm. In 1.5% and 3% biochar values ​​with 0.5-1 mm particle size and also in 3% biochar values ​​with 0-0.5 mm particle size, the increase in wheat yield was significant compared to the control. The highest significant positive correlation was observed between wheat yield and Dexter index. The results of this study showed that the changes of soil physical properties depend on the amount and particle size  of biochar and it should be considered when using this remediation method.

Keywords


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