“…Poincelot, 1986) Simplified agroecosystems and associated ecological problems (cf. Hodges and Schofield, 1983;Hill, 1985;Kloppenburg, 1988) Leaves few rotation options, resulting in soil degradation (cf. Kneen, 1988) 1973; Henderson, 1981;Robertson, 1983;Ekins, 1986;Callicott and Lapp@, 1988;Kierans and Stewart, 1988;Daly and Cobb, 1989).…”