Soy-Maize Crop Rotations in Sub-Saharan Africa: A Literature Review

Table 2

Maize: soybean rotation studies: key variables and nitrogen carryover levels.

Year	Lead author	Variable of interest	Country	N carryover
1989	Parkinson	Disease	Nigeria	NA
1989	MacColl	Nitrogen	Malawi	0–28 kg·ha^−1
1999	Kasasa	Yield nitrogen	Zimbabwe	9–170 kg·ha^−1
2000	Sauerbon	Yield	Ghana	NA
2006	Agyare	Yield	Ghana	NA
2006	Jemo	Nitrogen	Cameroon	17–45 kg·ha^−1
2006	Ojiem	Socio-economics	Kenya	NA
2007	Zingore	Yield socio-economics	Zimbabwe	0–62 kg·ha^−1
2008	Franke	Yield nitrogen	Nigeria	3–50 kg·ha^−1
2009	Kihara	Yield socio-economics	Kenya	52–90 kg·ha^−1
2010	Anyanzwa	Yield	Kenya	NA
2010	Oikeh	Yield nitrogen	Benin	21 kg·ha^−1
2013	Bado	Yield nitrogen	Burkina Faso	30–42 kg·ha^−1
2016	Nyagumbo	Yield	Malawi, Mozambique	NA
2018	Franke	Yield		NA
2019	Uzoh	Yield	Nigeria	16–46 kg·ha^−1

Maize yield improvement. Not applicable. Rice yield improvement.