Management practices to improve lowland subtropical summer tomato production : yields, economic returns and risk

摘要: Four experiments were conducted in southern Taiwan to evaluate the yield and economic benefits of management practices aimed at alleviating effects high temperature heavy rain on tomato production. Following tropical storms, waterlogging caused wilting which was more evident tomatoes grown beds 20 cm height than those raised 40 height. This indication crop water stress induced by flooding quantified measurement difference between canopy surface air a specified saturation vapour pressure deficit. Canopy heating less beds, especially when straddled shelters. Nevertheless, for low-bed treatment did not result loss stand. In crops experienced rain, application ofa synthetic fruit-set hormone enhanced fruit numbers as simple transparent polyethylene While planting without benefit use improved least 10 t ha -1 . A further 4-6 gained through additional Partial budget analysis showed positive returns (US$6600 ) but, unless shelters could be constructed with cheaper frame material or used two throughout summer, their would uneconomical. Using existing material, net rainshelters reached US$8000 The likelihood temperatures, storms typhoons will influence summer Data from this study may subjected analyses using values inputs prices other countries similar climatic conditions.