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Nitrogen Nutrition of Some Local Rice Varieties Grown without Fertilizer on Acid Sulphate Soil Area in South Kalimantan

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Author(s): Erry Purnomo | Toshihiro Hasegawa | Yasuyuki Hashidoko | Presto Janu Saputra | Mitsuru Osaki

Journal: Jurnal Tanah Tropika
ISSN 0852-257X

Volume: 14;
Issue: 1;
Start page: 41;
Date: 2009;
Original page

Keywords: N content | N mineralization | N uptake | plant top biomass

ABSTRACT
Nitrogen Nutrition of Some Local Rice Varieties Grown without Fertilizer on Acid Sulphate Soil Area inSouth Kalimantan (E. Purnomo, T. Hasegawa, Y. Hashidoko, P. J. Saputra and M. Osaki): Banjarese farmers in SouthKalimantan apply a very minimum nitrogen (N) fertilizer in growing local rice. This practice has been adopted for manyyears. Yet, the grain yield level at farmers’ field is not necessary low. Nitrogen sources for the crop are questioned.This study only focuses on measuring net N mineralization in association with N uptake. Three rice varieties at foursites in rice growing area of South Kalimantan are grown. The net N accumulation in soil and water, plant top biomass,N concentration of plant tissue and N uptake were measured on monthly basis. The results showed that all ricevarieties grown in the 4 locations took up more N than from N mineralized from the organic matter. The higher N in thecrop indicates that there are other sources of N for the local rice such as N fixed by microorganisms.
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