Abstract
Fertilizing recommendation for lowland rice field in West Kalimantan is still in national scale and tends to be excessive. It is less relevant due to various factors such as the test method competence, the carrying capacity of the land, and the diverse condition of rice field agro-ecosystem. Site-specific nutrient management (SSNM) is an approach for rice fertilizing on paddy plot based on science, history of land fertilization, and nutrient sources surrounding the area which can affect soil fertility level and soil conservation.This study was aimed to examine fertilizing efficiency of N, P, and K and the increased productivity of rice by utilizing software (website) of the IRRI. The study was conducted in farmers fields in two villages, i.e. Anjongan and Pak Bulu, Pontianak Regency, West Kalimantan. The results showed that the SSNM fertilization on rice increased yields by the average of 0.62 t ha-1 (13.47%) per growing season. The efficiency of SSNM fertilization was on the average of 22.05% N, 48.25% P2O5, and 31.50% K2O. The additional profits obtained from the SSNM recommendation was on the average of IDR 1,886,317 per ha pergrowing season compared to the profits from the FFP (farmer fertilizer practice).Keywords: Fertilizing efficiency, low land, rice, site specific fertilization [How to Cite: Muhammad H, M Syam and DP Widiastuti. 2014. Efficiency Test of IRRI Fertilizing Recommendations on Rainfed Low Land Rice Field in West Kalimantan. J Trop Soils 19: 25-33. Doi: 10.5400/jts.2014.19.1.25]
Highlights
The yield of local rice varieties are considered low compared to improved rice
Most of the soil condition the paddocks selected were marginally suitable for the improved rice
It can be concluded that inspite of the soil constraints, the yield of Padi Panjang variety grown on acid sulfate soil varied between 3.2 to 8.09 Mg ha-1
Summary
The yield of local rice varieties are considered low compared to improved rice. Farmers do not like to grow local varieties due to the longer growing period (Anonymous 2008b). They could only grow once a year. Local varieties are commonly grown by the farmers located in acid sulfate soil area of South Kalimantan. E Purnomo et al.: Tropical Rice Grown Without Fertilizer on Acid Sulfate Soil newlyfound local rice (later called by padi panjang) by themselves. Their paddocks are widely spread out in Aluh-Aluh and Gambut districts of South Kalimantan. We take this opportunity to investigate the yield variation of the padi panjang and the effect of chemical properties on the yield variation
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