Maize plays an important role in the livelihoods of rural communities in Rwanda. However, maize yields are threatened by the presence of pests and diseases and a general lack of knowledge and information for their management. In this study we sought to assess if plant clinics are making farmers more aware and knowledgeable of pests and diseases and are indirectly contributing to higher yields. We interviewed 644 farmers across Rwanda, both users and non-users of plant clinics. Propensity score matching was used to match the users and non-users of plant clinics and logistic regression was used to assess a number of factors, including interactions with plant clinics, that affect farmers' adoption of pest management practices. Our analysis shows that users of plant clinics are more aware and knowledgeable in recognizing and handling maize stem borers. Furthermore, users of plant clinics have on average higher yields than non-users and this difference is highly significant (P < 0.001). The analysis therefore demonstrates that plant clinics are beneficial to farmers in Rwanda. However, efforts are required to diversify the spectrum of practices that are promoted by plant clinics and by extension and advisory services in Rwanda.

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Africa's fertilizer use averages only 8 kg per hectare per year. Available fertilizer recommendations in Africa are high, and vary between countries. The recommendations are generally out dated, and/or "blanket" recommendations that are not site, or crop specific. Recommendation de-* Corresponding author.

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Field trials were conducted to determine the economically optimum fertilizer rates for soybean production and for optimizing net profits in Dedza, Lilongwe and Salima Districts of Malawi. The effects of PK fertilizer rates on rain use efficiency (RUE), harvest index, agronomic use efficiency of phosphorous (AEP) and potassium (AEK), and value cost ratio (VCR) were evaluated. The applied diagnostic PK fertilizer rates significantly improved soybean grain yields, harvest index, rainwater use efficiency, AEP, AEK and returns to fertilizer use expressed as value cost ratio (VCR). However, the results differed significantly (P < 0.01) among the three agro-ecological zones. The VCR values indicated that the most economical and profitable fertilizer rate was 7.5 kg/ha P in Salima, Dedza and Lilongwe. The lowest economical and profitable NP fertilizer rate was 22.5 kg/ha P plus 20 kg/ha K for Dedza and Lilongwe and 15 kg/ha P plus 30 kg/ha K for Salima District. All the VCR values obtained from applying different PK fertilizer nutrient rates were above two implying that all the applied fertilizer rates had a good value of returns to adequately cover against any risks associated with using fertilizers at smallscale under smallholder farms with inadequate financial resources. The results also presented different available NP fertilizer application rate options for maximizing profits for the financially constrained smallholder farmers.