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Site Specific Nutrient Management for Maize on Ultisols Lampung

Author(s): Andarias Makka Murni | Julie Mae Pasuquin | Christian Witt

Journal: Jurnal Tanah Tropika
ISSN 0852-257X

Volume: 15;
Issue: 1;
Start page: 49;
Date: 2010;
Original page

Keywords: Agronomic efficiency | fertilizer | nutrient management | site specific | yield response

Lampung is the third major maize producing province in Indonesia after East Java and Central Java. In Lampungmaize is cultivated mainly in upland areas with ultisols and only some cultivated on paddy field as a secondary cropin the dry season. The average maize yield in Lampung is still 3.4 Mg ha-1 bellow yield potential of 7 - 10 Mg ha-1. Toincrease the productivity of maize through site-specific nutrient management (SSNM), on-farm trials were conductedin five locations in Lampung i.e. four locations in Central Lampung District (Sidowaras, Binjai Ngagung, Watu Agungand Balai Rejo) and one location in South Lampung District (Trimulyo, Tegineneng Sub District) during the 2004/2005,2005/2006 and 2006/2007 rainy seasons. The experimental setup followed a standard protocol at all sites and includednutrient omission plots (PK, NK, NP) to estimate indigenous nutrient supplies, an NPK plot to measure yield responseto fertilizer application, and a farmers’ fertilizer practice (FFP) plot in each farmer’s field. An SSNM treatment plot wasincluded in the second and third seasons. Each of the above treatments was paralleled by a plot with improved cropmanagement practice (ICM), i.e. higher planting density, addition of lime, and addition of magnesium. Results showedthat yield response to fertilizer N, P and K application in these sites were: N = 2.3 - 4.1 Mg ha-1; P = 0.6 - 2.0 Mg ha-1;K = 0.3-2.4 Mg ha-1. Attainable yield in the three seasons on average ranged from 7.6 Mg ha-1 to 10.6 Mg ha-1. Yield inthe SSNM treatment (with or without ICM) was significantly higher than the FFP indicating great opportunities forfarmers to increase productivity and profitability with improved nutrient and crop management
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