Establishing soil phosphorus critical level for potato (Solanum tuberosum L.) in Andisol of Lembang, Indonesia
2019
Debaba, G.H. | Hartono, A. | Sudadi, U. | Indriyati, I.T.
A greenhouse experiment on soil diagnosis on phosphorus (P) fertilizer trial was conducted for potato in Andisol of Lembang district at Assessment Institute for Agricultural Technology (BPTP) from February to June 2018 in Indonesia. The treatments consisted of seven level of P fertilizer amount (0, 25, 50, 75, 100, 125, and 150 kg/ha) with three replications for low and high P soil arranged in completely randomized design. Bulk soil samples were collected from agricultural land and categorized as low and high P soil with respect to the soil's native fertility status. Soil test P was extracted by Olsen method. The result showed that P fertilizer significantly affected tuber yield. Correlation and calibration result of Olsen soil test P with relative tuber yield result indicated that 68.8 mg P kg and 191 mg P kg was critical level for potato production in Andisol for low and high P soils respectively. Result showed that at values less than these critical level of extractable P, P fertilizer should be applied to increase potato tuber yield. The application of phosphorus fertilizer at different amount increased tuber yields of potato by 21.8-40.1% and 15.3-28.4% for low and high P soil respectively as compared to the control yield. Available soil test phosphorus extracted by Olsen method three weeks after planting significantly responded to P fertilizer rate.
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