Abstract
This study aimed to examine Organonitrofos Plus fertilizer (OP) on sweet corn (Zea mays Saccharata L.) and its effect on changes in soil chemical properties of Ultisols. Organonitrofos Plus fertilizer is an enhancement of Organonitrofos fertilizer enriched with microbes at the beginning of the manufacturing process. Research was conducted in the greenhouse of Integrated Agricultural Laboratory of Lampung University. Treatment applied was a factorial of 4 × 2 × 3 with three replications in a randomized block design. The first factor was the dose of OP fertilizer (0, 10, 20, 30 Mg ha-1), the second factor was the dose of inorganic fertilizers (without inorganic fertilizers, and with inorganic fertilizers, namely Urea 0.44, 0.28 SP-36 and KCl 0.16 Mg ha-1), and the third factor was the dose of biochar (0, 10, 20 Mg ha-1). By a single OP fertilizers, inorganic fertilizers, and the interaction between the OP and the inorganic fertilizers increased the weight of dry stover, cob length, cob diameter, cob with husk and cob without husk of corn. OP fertilizers which are applied in Ultisols can improve soil fertility and increase corn production so that OP fertilizer can lessen the use of inorganic fertilizer and can be used as a substitute for inorganic fertilizer. RAE values were highest in treatment of O4K2B2 (30 Mg OP ha-1, with inorganic fertilizer, 10 Mg biochar ha-1) that was equal to 181%, followed by O2K2B3 (10 Mg OP ha-1, with inorganic fertilizer, 20 Mg biochar ha-1 ) with the difference in RAE value of 0.5%. [How to Cite: Dermiyati, SD Utomo, KF Hidayat, J Lumbanraja, S Triyono, H Ismono, NE Ratna, NT Putri dan R Taisa. 2016. Pengujian Pupuk Organonitrofos Plus pada Jagung Manis (Zea mays Saccharata. L) dan Perubahan Sifat Kimia Tanah Ultisols. J Trop Soils 21: 9-17 Doi: 10. 10.5400/jts.2016.21.1.9]
Highlights
Soil PreparationSweet corn is one of a horticulture commodity that is very popular for Indonesianbecause it has several advantages compared to ordinary corn
The highest N uptake was in O3K2B3 treatment (OP 20 Mg ha-1, with inorganic fertilizer, biochar 20 Mg ha-1) which was followed by O2K2B3 treatment (OP 10 Mg ha-1, with inorganic fertilizer, biochar 20 Mg ha-1) with difference of 1% and O4K2B1 (OP 30 Mg ha-1, with inorganic fertilizer, without biochar) with 3% difference, while the lowest yield was found on O1K1B1
The highest P uptake was on O4K1B1 treatment (OP 30 Mg ha-1 + without inorganic fertilizer + without biochar) which was followed by O3K2B3 treatment (OP 20 Mg ha-1 + with inorganic fertilizer + biochar 20 Mg ha-1) with difference of 4%, while the lowest result was in O1K1B1
Summary
Sweet corn is one of a horticulture commodity that is very popular for Indonesianbecause it has several advantages compared to ordinary corn. The productivity of sweet corn in Indonesia is still low. Sweet corn production in Lampung in 2012 around 4-5 Mg ha-1 (BPS 2013). According to Prasetyo and Suriadikarta (2006), one of the lowest obstacles for production of sweet corn in Lampung Province because the land in Lampung is dominated by Ultisols that contains low nutrients, high acidity and low soil organic matter. To get the nutrients need of sweet corn as well as to increase soil productivityin Ultisols are required inorganic and organic fertilizers.The use of fertilizers in a balanced between inorganic and organic fertilizers can meetnutrients need of sweet corn
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