Impact of NPK and organic fertilizer on tomato (Lycopersicon esculentum Mill.) growth and yield under greenhouse conditions
Publication Date : 21/09/2017
The study was conducted in two successive summer seasons (2104/2015 and 2015/2016) in a cooled plastic house at Shambat Research Station, Sudan, to determine the optimum dose of nitrogen, phosphorus, potassium (NPK) and organic (Shmookh Eltabeeh) fertilizers combination to have high tomato growth and yield under evaporative cooling system. Two tomato hybrid, were used namely; Athyla and PGT107. The experiments were carried out in a split plot arrangements based on a randomized complete block design, the two tomato hybrids as main plot and eight fertilizer treatments as sub plot with three replication. The seedlings were transplanted on one side of 80 cm ridges and 40 cm plant spacing. Different combinations of nitrogen, phosphorus and potassium (T1: 13.4 g N + 5.0 g P+ 26.7 g K, T2: 26.7 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) with or without organic fertilizer (2kg/m2 Shmookh Eltabeeh), in addition to a control without fertilizer, were tested. The organic fertilizer was incorporated in soil before planting, whereas the NPK doses were added as powder weekly after two weeks from transplanting. The means were compared using Duncan Multiple Range Test (DMRT) at P < = 0.05. The results showed that T2 from NPK combination with or without organic fertilizer gave significant positive effects on all parameters tested in both seasons with the two hybrids. The growth and yield values were decreased with increased fertilizer dose above T2 showing that excessive NPK fertilization (T3 with or without organic) for high tomato yield under evaporative cooling system is not recommended.
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