caa a22 4500 477111734 CHVBK 20180405111611.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00015304 doi (NATIONALLICENCE)springer-10.1007/BF00015304 Soil properties and crop performance on a kaolinitic Alfisol after 15 years of fallow and continuous cultivation [Elektronische Daten] [Anthony Juo, Kathrin Franzluebbers, Adenike Dabiri, Benson Ikhile] A long-term field experiment was established on a kaolinitic Alfisol in Ibadan, Nigeria, in 1972. The land was cleared manually from secondary forest and used for (i) continuous no-till cropping with maize (Zea mays L.) and maize/cassava (Manihot esculenta Crantz) intercropping, (ii) planted fallow of guinea grass (Panicum maximum Jacq.), leucaena (Leucaena leucocephala de Wit), and pigeon pea (Cajanus cajan Millsp.), and (iii) natural bush regrowth in a randomized complete block design with three replications. At the end of 15 years, the fallow plots were cleared manually and cropped with maize for three years. The chemical and physical soil properties and crop performance of the newly-cleared plots were compared with those under 15 years of continuous cultivation. A total of 26 woody species were identified on the bush regrowth plots. Above-ground biomass accumulation of the bush plots was 157 Mg ha-1 containing 1316 kg N ha-1. Guinea grass, leucaena and natural bush regrowth plots had comparable organic C concentrations (approximately 20 g kg-1) in the surface soil (0 to 10 cm) after 15 years. The organic C concentration in the surface soil under pigeon pea was the lowest (9.5 g kg-1) among the four fallow treatments. Soil under 15 years of continuous no-till maize with and without residue mulch, respectively, contained approximately half (10 g kg-1) and a quarter (5.7 g kg-1) of the organic C under natural bush or guinea grass fallow. The levels of exchangeable Ca, K, Mg and effective cation exchange capacity (ECEC) were lower in the soils under continuous cultivation than in those under natural bush and planted fallow. Soil acidification occurred in soils under continuous cropping as depicted by the lower pH values and greater exchangeable Al and Mn concentrations compared to the fallow plots. Grain yield of maize (3 to 5 Mg ha-1) without fertilizer application in the plots newly cleared from natural bush, guinea grass and leucaena fallow was comparable with that of continuous no-till maize with residue mulch and chemical fertilizer (N, P, K, Mg, Zn) applications. Among the four fallow treatments, maize grain and stover yields were the lowest in plots cleared from pigeon pea fallow. Kluwer Academic Publishers, 1996 bush fallow nationallicence continuous cultivation nationallicence exchangeable cations nationallicence organic carbon nationallicence planted fallow nationallicence soil acidification nationallicence Juo Anthony Department of Soil and Crop Sciences, Texas A & M University, 77843-2474, College Station, Texas, USA aut Franzluebbers Kathrin Department of Soil and Crop Sciences, Texas A & M University, 77843-2474, College Station, Texas, USA aut Dabiri Adenike International Institute for Tropical Agriculture (IITA), Oyo Road, PMB 5320, Ibadan, Nigeria aut Ikhile Benson International Institute for Tropical Agriculture (IITA), Oyo Road, PMB 5320, Ibadan, Nigeria aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 180/2(1996-03-01), 209-217 0032-079X 180:2<209 1996 180 11104 https://doi.org/10.1007/BF00015304 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00015304 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Juo Anthony Department of Soil and Crop Sciences, Texas A & M University, 77843-2474, College Station, Texas, USA aut NATIONALLICENCE 700 1- Franzluebbers Kathrin Department of Soil and Crop Sciences, Texas A & M University, 77843-2474, College Station, Texas, USA aut NATIONALLICENCE 700 1- Dabiri Adenike International Institute for Tropical Agriculture (IITA), Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 700 1- Ikhile Benson International Institute for Tropical Agriculture (IITA), Oyo Road, PMB 5320, Ibadan, Nigeria aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 180/2(1996-03-01), 209-217 0032-079X 180:2<209 1996 180 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer