Effect of commercial organic fertilizers on the yield of melon and watermelon in Serbia

Efekat primene komercijalnih organskih đubriva na prinos genotipova dinje i lubenice je ispitivan na osnovu podataka dvogodišnjeg ogleda (2011 i 2012). Iz kolekcije Instituta za povrtarstvo u Smederevskoj Palanci je uzeto 5 genotipova dinje (Fiata, Cerovača, Galia, Charentais, Passport) i 5 genotipova lubenice (Crimson sweet, Fairfax, Greybelle, Domaća, Dunay). Nakon rasađivanja izvršena je prihrana svakog genotipa sa 4 komercijalna organska đubriva: Italpollina, DCM Ekomix, Guanitto i Duetto. Kao kontrola je korišćeno đubrivo NPK. Osnovni cilj rada je bio da se odrede genotipovi dinje i lubenice koji bi mogli da se preporuče za proizvodnju u organskom sistemu gajenja. Takođe, jedan od ciljeva je bio da se uporede prinosi po biljci dinje i lubenice u organskom i konvencionalnom sistemu gajenja. Utvrđene su veoma značajne razlike prinosa po biljci između posmatranih genotipova, godina, tretmana i interakcija i kod dinje i kod lubenice. Kod genotipa dinje Charentais je utvrđen najveći uticaj komercijalnih organskih đubriva. DCM Ekomix je imao negativan uticaj na prinos po biljci kod svih posmatranih genotipova lubenice. Gajenjem dinje uz primenu komercijalnih organskih đubriva je moguće ostvariti veće prinose po biljci u odnosu na primenu neorganskih mineralnih đubriva.In this paper was studied effect of commercial organic fertilizers on the yield per plant of melon and watermelon genotypes based on the two- year data (2011 and 2012). Five genotypes of melon (Fiata, Cerovača, Galia, Charentais, Passport) and five genotypes of watermelon (Crimson Sweet, Fairfax, Greybelle, Domestic, Dunay) were selected from the collection of the Institute for vegetable crops from Smederevska Palanka. After plants were planted in the open field fertilization of each genotype with 4 commercial organic fertilizer: Italpollina, DCM Ekomix, Guanitto and Duetto was performed. NPK fertilizer was used as control. The main objective of this study was to determine the genotypes of melon and watermelon which could be recommended and introduced into organic farminf system. Also, one of the aims was to compare the yield per plant of melon and watermelon in organic and conventional farming system. Very significant differences of yield per plant were found between the genotypes, years, treatment and their interaction, both for melon and watermelon. For melon genotype Charentais was determined the strongest effect of commercial organic fertilizers. DCM Ekomix had a negative effect on yield per plant for all genotypes of watermelon. In the melon production, it is possible to achieve higher yields per plant using commercial organic fertilizers compared to inorganic fertilizers