Evaluation of drainage and tillage effect on watertable depth and maize yield in wet inland valleys in southwestern Nigeria |
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| Institution: | 1. Department of Soil Science, University of Uyo, Uyo, Nigeria;2. Department of Agronomy, University of Ibadan, Ibadan, Nigeria;1. College of Agronomy, Northwest A&F University, Yangling 712100, China;2. Key Laboratory of Crop Physi-ecology and Tillage Science in Northwestern loess Plateau, Ministry of Agriculture, Northwest A&F University, Yangling 712100, China;1. Jiangsu Key Laboratory of Agricultural Meteorology, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 21044, China;2. State Key Laboratory of Grassland Agro-Ecosystem, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University, 730000 China;3. Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun town, Mengla county, Yunnan Province 666303, China;1. College of Agronomy, Northwest A&F University, Institute of Water-Saving Agriculture in Arid Area of China, Northwest A&F University, Yangling, 712100 Shaanxi, China;2. Key Laboratory of Crop Physi-Ecology and Tillage Science in Northwestern Loess Plateau, Ministry of Agriculture, Yangling, 712100 Shaanxi, China;1. Gansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou 730070, China;2. College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China;3. China Agriculture University, Beijing 100094, China;1. State Engineering Laboratory of Efficient Water Use of Crops and Disaster Loss Mitigation/MOA Key Laboratory for Dryland Agriculture, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China;2. Department of Research Management, Chinese Academy of Agricultural Sciences, 100081, PR China;3. Department of Civil and Environmental Engineering, Princeton University, Princeton 08544, USA |
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| Abstract: | A study was conducted in three wet inland valley bottoms, namely, high (MHW), medium (MMW) and low (MLW) watertable sites to evaluate the effect of drained (D) and control (Do), and mound-tillage (MT), ridge-tillage (RT) and no-tillage (NT) treatments on watertable depth and yield of maize in 1990 wet and 1990/1991 dry season in southwestern Nigeria. The watertable depth averaged 30.0 cm in the drained plot and <15.0 cm in the control plot in 1990. The watertable tended toward its lowest depth averaging 44.8 cm in the drained and 26.2 cm in the control plot in 1990/1991. Soil moisture content was lower (P<0.01) and air-filled porosity greater (P<0.01) in the mound-tilled compared with the ridge tilled and no-till soils in both drained and control plots in 1990 and 1990/1991. Equally, green maize yield from the mound-tillage and ditch drainage system was greater (P<0.01) than the ridge-tillage and no-tillage systems in both seasons. Maize may be grown successfully with a ditch drainage and mound-tillage system in the wet soils in inland valley bottoms regardless of their watertable regimes in southwestern Nigeria. |
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