Spatial variability of N, P and K in rice field in Sawah Sempadan, Malaysia

Variability of soil chemical properties such as total N, available P, and exchangeable K were examined on a 1.2 ha rice (Oryza sativa) field. The soil (n = 72) samples were systematically taken from individual fields in Sawah Sempadan in thirty-six locations at two depths (0-20 and 20-30 cm). The Di...

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Bibliographic Details
Published in:Wārasān Songkhlā Nakharin 2002-04, Vol.24 (2), p.321-328
Main Authors: Eltaib, S.M.(Universiti Putra Malaysia, Serdang (Malaysia). Faculty of Engineering. Dept. of Biological and Agricultural Engineering) E-mail:taib123@hotmail.com, Soom, M.A.M.(Universiti Putra Malaysia, Serdang (Malaysia). Faculty of Engineering. Dept. of Biological and Agricultural Engineering), Hanafi, M.M.(Universiti Putra Malaysia, Serdang (Malaysia). Faculty of Agriculture. Dept. of Land Management), Shariff, A.R.M.(Universiti Putra Malaysia, Serdang (Malaysia). Faculty of Engineering. Dept. of Biological and Agricultural Engineering), Wayayok, A.(Universiti Putra Malaysia, Serdang (Malaysia). Faculty of Engineering. Dept. of Biological and Agricultural Engineering)
Format: Article
Language:English
Subjects:
DGPS
geostatistics
Malaysia
Nitrogen content
Phosphorus
point kriging
Potassium
Rice fields
semivariogram
Soil chemicophysical properties
Spatial distribution
spatial variability
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Summary:Variability of soil chemical properties such as total N, available P, and exchangeable K were examined on a 1.2 ha rice (Oryza sativa) field. The soil (n = 72) samples were systematically taken from individual fields in Sawah Sempadan in thirty-six locations at two depths (0-20 and 20-30 cm). The Differential Global Positioning System (DGPS) was used for locating the sample position. Geostatistical techniques were used to analyze the soil chemical properties variability of the samples that assist in site-specific management of the field. Results showed that areas of similarity were much greater for the soil chemical properties measured at the depth of (0-20 cm) than that of the second lower (20-30 cm). The ranges of the semivariogram for total N, available P, and exchangeable K were 12, and 13 m (0-20 cm), 12 and 38 m (20-30 cm), respectively. Point kriging calculated from the semivariogram was employed for spatial distribution map. The results suggested that soil chemical properties measured may be spatially dependent even within the small.
ISSN:0125-3395