Abstract
Indonesia has 14.93 million ha of peat lands spread across Sumatra, Kalimantan and Papua. Peatlands productivity is very low due to its characteristics that do not support optimal plant growth. The research objective was to assess the effect of P fertilizer application on peat lands to sweet corn yield and determine the dosage. This research has been carried out on drained peat lands in Rasau Jaya, Kubu Raya Regency in West Kalimantan. The research used a randomized complete block design with nine treatments namely Control, NK, NPK, NPK+Mg, ¾ NK+700 kg P fertilizer ha−1 and four rates of P fertilizer were 350, 700, 1,050 and 1,400 kg ha−1. The results showed that the P fertilizer application has significantly affect plant growth, ear length, ear diameter, biomass and yield of fresh sweet corn ear. The application of NK+700 kg P fertilizer ha−1 produced higher biomass by 77% and 47% compared to NPK+Mg treatment and NK treatment respectively. The application of 700 kg P fertilizer ha−1 also significantly increased fresh ears by 51% and 43% compared to NPK+Mg treatment and NK treatment respectively. The optimum rate of P fertilizer for sweet corn on peat lands is 670 to 890 kg ha−1.
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