Ways Forward? Technical Choices, Intervention Strategies and Policy Options 391Notes
1 It is beyond the scope of this chapter to review these in detail, but many other studies provide
useful overviews. For example, Bumb and Baanante (1996) and Larson (1993) on fertilizer use;
Lal (1984) on soil conservation; Greenland and Nye (1959) on fallows; Vogel (1994) on tillage;
Mugwira and Murwira (1997) on animal manures; Giller and Cadisch (1995) on nitrogen fixa-
tion and Jones et al (1997) on legume residue use.
2 For example in Zimbabwe, 10 tons of manure per hectare every three years is the standard recom-
mendation.
3 See Defoer and Budelman (2000) for a set of practical guidelines about how to develop an inte-
grated soil-fertility management approach at farm level over a series of cropping seasons.
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