EFFECT OF MULCH AND DIFFERENT FUNGICIDE SPRAY REGIMES ON YIELD OF TOMATO (SOLANUM LYCOPERSICUM L.) IN TANZANIA

ABSTRACT In many areas in Tanzania, pests management for tomato involves weekly pesticide sprays. The practice poses a threat to the environment and health of consumers. In this study the effect of pesticide spray regimes and use of mulch were evaluated on 'Tanya VF' and 'Tengeru 97' tomato varieties. Field experiment consisting of a 2×2×4 factorial arrangement in a split-split plot design with three replications was conducted at Sokoine University of Agriculture, Morogoro (6 o 05'S, 35 o 37'E and 525m above sea level). Treatment factors comprised two varieties (main plot factor), mulching/number of mulching (subplot factor) and three fungicide spray regimes (sub subplot factor). Results showed that the spray regimes: farmers' practice (FP), Integrated Pests Management (IPM) based on pests scouting, sprays based on manufacturers' recommendation (MR); produced significantly more fruits per plant and higher fruit weight compared to the control. There was no significant difference (p < 0.05) between FP, IPM and MR on fruit yield parameters. The results further revealed that use of mulch significantly led to higher fruit number per plant (p = 0.020). Although average fruit weight was similar (p < 0.05), other marketable fruit yield parameters were statistically different between mulched and non-mulched plots (p = 0.007). 'Tanya VF' had consistently higher yields compared to 'Tengeru 97'. Fungicide sprays were statistically different to the control with respect to blossom end rot (p = 0.002), fruit rot (p < 0.001) and percentage of non-marketable yield (p = 0.001). Mulching significantly reduced American bollworm and blossom end rot (p = 0.012, p = 0.003, respectively). The major contributor to tomato fruit loss was Blossom End Rot (BER) and Fruit Rot for 'Tengeru 97' and 'Tanya VF', respectively. It is evident, therefore, that: a proper combination of tomato cultural management practices can significantly reduce the use of pesticides, and improve tomato fruit quality and marketable yield which would increase profit margin accrued by farmers

Urbanization and transformation of agri-food system: Opportunities for organic producers in developing countries

Developing countries especially in Sub-Saharan Africa are pronominally agricultural based. Where the majority of the population resides in rural areas and engaged in agriculture as a source of livelihood. However, recently there has been a growing debate globally on rapid urban population growth in developing countries. The aim of this paper is to present opportunities for organic producers emanating from transformations of agri-food systems in urban area. The paper is based on research activities of a project ‘Productivity and Growth in Organic Value Chains (ProGrOV)’. ProGrOV is collaboration between universities in Uganda, Kenya, Tanzania and Denmark addressing the need for sustainable development of smallholder farming systems in East Africa with focus on value chains for local high-value markets as well as export chains. The project addresses innovations for improving production as well as market access. The transformations of agri-food systems addressed in this paper resulting from urbanization are evidenced by proliferation of supermarkets, specialized organic-food shops, food supply to tourist industry and traditional farmer markets. Efforts for promoting organic products in East Africa have traditionally focused on export markets this paper based on evidence from ProGrOV studies argue that there is opportunity for developing domestic organic product value chains to meet the demand from urban population growth and transformed agri-food systems