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Contributory factors to soil spatial variability in an ultisol 1. Burning vegetation residues in heaps during land clearing by Hulugalle, N.R.

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Amelioration of a highly degraded tropical alfisol by planting 1. Changes in soil physical and chemical properties by Hulugalle, N.R.

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Tillage systems for the West African semiarid tropics by Hulugalle, N.R., Maurya, P.R.

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Effect of cassavabased cropping systems on physicochemical properties of soil and earthworm casts in a tropical Alfisol by Hulugalle, N.R., Ezuma, H.C.

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Effect of seedbed preparation method and mulch on soil physical properties and yield of cowpea in a rice fallow of an inland valley swamp by Hulugalle, N.R., Palada, M.C.

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Effect of five years of notillage and mulch on soil properties and tuber yield of cassava on an acid Ultisol in southeastern Nigeria by Hulugalle, N.R., Lal, R., Gichuru, M.

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Effect of hedgerow species in alley cropping systems on surface soil physical properties of an Oxic Paleustalf in southwestern Nigeria by Hulugalle, N.R., Kang, B.T.

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Alleviation of soil constraints to crop growth in the upland alfisols and associated soil group of the West African Sudan savannah by tied ridges by Hulugalle, N.R.

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Management of plant residue for cassava (Manihot esculenta) production on an acid ultisol in Southeastern Nigeria by Hulugalle, N.R., Lal, R., Opara-Nadi, O.A.

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Alleviation of soil constraints to crop growth in the upland Alfisols and associated soil groups of the West African Sudan savannah by tied ridges by Hulugalle, N.R.

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Soil water balance of intercropped maize and cowpea grown in a tropical hydromorphic soil in western Nigeria by Hulugalle, N.R., Lal, R.

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Soil physical changes and crop root growth following different methods of land clearing in western Nigeria. by Hulugalle, N.R., Lal, R., Ter Kuile, C.H.H.

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Root growth of maize in a compacted gravelly tropical alfisol as affected by rotation with a woody perennial by Hulugalle, N.R., Lal, R.

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