Abstract
A longterm experiment was conducted on Alfisols at Ibadan, Nigeria, to assess agricultural productivity and sustainability of different farming systems. The experiment, conducted for a 10 year period from 1979 to 1988, was implemented in two phases. The effects of methods of land clearing on crop growth-yield were evaluated during Phase I from 1979 to 1982. Effects of different farming systems on agronomic productivity were evaluated in Phase II from 1983 to 1988. Six land clearing-cum-tillage treatments evaluated in Phase I were: (i) manual clearing with no-till, (ii) manual clearing with plow-till, (iii) shearblade clearing with no-till, (iv) treepusher/rootrake clearing with no-till, (v) treepusher/rootrake clearing with plow-till, and (vi) traditional farming. Similarly, six farming systems evaluated in Phase II were: (i) alley cropping with Leucaena leucocephala, (ii) Mucuna fallowing on severely degraded soils (iii) Mucuna fallowing on moderately degraded soil, (iv) ley farming on severely degraded ...
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