Economic analysis of fungicide and fertilizer applications on huckleberry (<i>Solanum scabrum</i> Mill.) fresh shoot yield
Keywords:
Economics analysis, Fertilization, Fungicide, Poultry manureAbstract
An economic analysis of fungicide and fertilizer applications on huckleberry fresh shoot yield was carried out in August- December 2006 and in March-July 2007. Six varieties (SS05.1, S18, SS08, SS19, SS25.1, and SS01), four levels of fertilization (unfertilized, mineral fertilizer (NPK), and 10 and 20 Mg ha–1 of poultry manure), and fungicides were evaluated in a split plot trial. The sub-plots received Ridomil Plus® (12% metalaxyl + 60% cuprous oxide), at a rate of 2.5 kg ha–1 on appearance of first foliar late blight symptoms. Fungicide application reduced late blight severity. Yield increase due to fungicide application was as high as 16.14 Mg ha–1. Fertilizer application increased fresh shoot yields (range: 0.60 to 46.18 Mg ha–1). However, poultry manure application increased both huckleberry yields and late blight infestations. In economic terms, the results showed a maximum benefit of €3494 ha–1due to fungicide application. The net benefit due to fertilizer application varied between €28 and €1514 ha–1 for NPK; €455 and €3120 ha–1 for 10 Mg ha–1 of poultry manure; and €328 and €9258 ha–1 for 20 Mg ha–1 of poultry manure. Variety SS05.1 gave the highest net benefit due to fungicide and fertilizer applications and is therefore recommended where the pesticides are available. Variety SS25.1 is resistant to late blight and high yielding and therefore could be cultivated without fungicides, with or without fertilizers.Downloads
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