Abstract
This study objective was to determine the dose of organic and inorganic fertilizers which can increase N, P and K nutrients uptake as well as the growth and yield of sweet corn on inceptisol soil of lowland swamp. Inceptisol soil has low soil fertility and relatively low to moderate levels of organic matter content. Application of organic fertilizer on inceptisol soil of lowland swampis expected capable to increase N, P and K nutrients as well as yield of sweet corn. This research was conducted from April to July 2014 at Experimental Farm Area of Pulau Semambu Village, Indralaya Utara Subdistrict, Ogan Ilir District, South Sumatra Province. The method used in this research was randomized block design consisting treatments as follows: 75% inorganic fertilizer + 5 ton.ha −1 organic fertilizer, 50% inorganic fertilizer + 5 ton.ha −1 organic fertilizer, 25% inorganic fertilizer + 5 ton.ha −1 organic fertilizer, 0% inorganic fertilizer + 5 ton.ha −1 organic fertilizer with six replications. The recommended dose of inorganic fertilizerswas 200 kg.ha −1 urea, 100 kg.ha −1 SP-36 and 100 kg. ha −1 KCl. The results showed that treatment of 75% of inorganic fertilizer + 5 ton.ha −1 organic fertilizer had produced N, P and K nutrients uptake with magnitude of 1.850, 0.418 and 2.374 g.plant −1 respectively as well as good growth and yield of sweet corn with magnitude of 356.36 g. plant −1 or 15.21 ton ha −1 .
Highlights
Sweet corn(Zea mays saccharata) seasonal crop that has high economic value because its seed has higher sugar content than that of other corn varieties
Vitamin C of 12.0 mg andwater of 72.7 g [12].Sweet corn crop can cultivated on suboptimal land such as lowland swamp
Lowland swamp area in South Sumatra is relatively extensivewith magnitude of 368,685 hectares and most area was cultivated for rice crop and small area was cultivated for other crops such assweet corn crop [23]
Summary
Sweet corn(Zea mays saccharata) seasonal crop that has high economic value because its seed has higher sugar content than that of other corn varieties. Sweet corn has energy of 96 cal, Protein of 3.5 g, Lipid of 1.0 g, Carbohydrate of 22.8 g, Calcium of 3.0 mg, Phosphorusof 111 mg, Iron of 0.7 mg, Vitamin A of 400 SI, Vitamin B of 0.15 mg, Vitamin C of 12.0 mg andwater of 72.7 g [12].Sweet corn crop can cultivated on suboptimal land such as lowland swamp. Lowland swamp has very high potential to be developed in order to increase crop production such as sweet corn crop. The main problem in lowland swamp area is its physical constraint in form of water logging and chemical constraint in form of high soil acidity, Al and Fe cations which bind phosphorus and nutrients defficiency [13]. According to [3], soil fertility level in lowland swamp area is very low to medium so that fertilization effort is important to increase the productivity of lowland swamp
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