Chemical and organic fertilization on Tomato (Lycopersicon esculentum Mill.) quality under greenhouse conditions
Publication Date : 06/10/2017
Experiments were conducted during two successive periods 2015/2016 in a cooled plastic tunnel at Shambat Research Station, Sudan, to determine the optimum dose of nitrogen, phosphorus, potassium and organic fertilizers on tomato fruits quality under green house conditions using two tomato (“Athyla” and PGT107) hybrids. A split plot design replicated three times was used. The fertilizer treatments were (T1: 13.4 g N + 5.0 g P+ 26.7 g K, T2: 26.6 g N + 10.0 g P + 53.3 g K and T3: 40.1 g N + 20.0 g P + 80.0 g K/ m2) in each group, the each of these was mixed with 2kg organic/m2, 2kg/m2 organic alone and control (without fertilizer) used as a sub plot. Hybrids were assigned to be the main plots. Fruit quality was accessed as percentage of marketable fruits/m2, total soluble solid “TSS”, acidity and ascorbic acid content). The means were compared using Duncan Multiple Range Test (DMRT) at P < = 0.05. The results showed that there was no significant difference between the two hybrids in response to NPK combination with or without organic. The results also showed that T2 from NPK combination with or without organic fertilizer gave significant positive effects on all quality parameters tested in both seasons. The quality values were decreased with increased fertilizer dose above T2 showing that excessive NPK fertilization (T3 with or without organic) for high quality tomato under evaporative cooling system is not recommended.
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