Initial effect of shifting from traditional to no-tillage on runoff retention and sediment reduction under rainfall simulation
Haytham Mohamed Salem
A B * , Ali Mohamed Ali C D , Weicheng Wu A and Qihong Tu A
+ Author Affiliations
- Author Affiliations
A Key Laboratory of Digital Land and Resources, East China University of Technology, Nanchang, 330013 Jiangxi, P.R. China.
B Department of Soil and Water Conservation, Desert Research Center, 11753 Cairo, Egypt.
C Department of Soil Fertility and Microbiology, Desert Research Center, 11753 Cairo, Egypt.
D The National Committee of Soil Science, Academy of Scientific Research and Technology, Egypt.
Soil Research 60(6) 547-560 https://doi.org/10.1071/SR21082
Submitted: 25 March 2021 Accepted: 20 July 2021 Published: 20 October 2021
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Low precipitation and soil erosion are critical threats to sustainable agricultural development in the north-western coastal zone of Egypt. Conservation tillage may offer a good opportunity to mitigate these threats; however, switching from traditional tillage to conservation tillage causes initial challenges such as soil compaction and erosion.
Aims: This study was designed in order to assess the effects of various tillage practices on soil bulk density, volumetric water content, runoff rate, runoff initiation time, soil loss, sediment yield rate and wheat (Triticum aestivum L.) yield in a cultivated basin area. Furthermore, to investigate the efficacy of various rainfall intensities in generating runoff in a micro-catchment area.
Methods: Under rainfall simulation, five rainfall intensities (14, 21, 30, 36, and 45 mm h−1) and three tillage practices (contour tillage, CT; traditional tillage, TT; and no tillage, NT) were investigated.
Key results: Under various rainfall intensities, the CT treatment significantly reduced surface runoff compared with the TT and NT treatments. For the 30 mm h−1 rainfall intensity, the CT treatment decreased sediment yield rate by 58.7% and 49.4% compared with NT and TT treatments, respectively. Furthermore, the CT treatment significantly increased precipitation use efficiency by 11.8% and 19.9% compared with TT and NT treatments, respectively. Additionally, the CT increased grain yield by 12.3% more than TT and 21% more than NT.
Conclusions and implications: Consequently, it is preferable to encourage farmers to use CT practices when transitioning from traditional tillage to conservation tillage. Moreover, soil compaction and smoothing may contribute to enhance the generated runoff on the micro-catchment area.
Keywords: precipitation use efficiency, rainfall intensity, runoff, soil erosion, soil moisture, soil properties, tillage practices, wheat yield.
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