Citation
Baki Bakar, . Spatial pattern analysis of weeds in selected rice fields of Samarahan Sarawak Malaysia. pp. 121-128. ISSN 0128-0686
Abstract
Exploratory surveys were conducted in Samarahan Division Sarawak in 1990-1991 to ascertain common weeds prevailing in rice field. Spatial patterns of weed species in five 1 m2 quadrats in each 87 farms were analysed. Three indices of dispersion (varience-to-mean ratio Lloyd's patchiness) and the Moran's I statistics of spatial autocorrelation were calculated. Weed species were almost exclusively composed of annuals dominated by Fimbristylis miliacea and 30 other principal species. These species exhibited aggregated distributions with Lloyd's mean crowding values ranging from 0.738 for Fuirena umbellata to 21.933 for Fimbristylis miliacea. Spatial autocorrelation values based on Moran's I statistics were found to be positive and significantly greater than (EI) at p 0.05 for 17 species thus suggesting aggregation or patchiness. The degrees of clustering for those species were highly irregular indicating that plants distribution is probably due to biological or agroclimatic factors
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Abstract
Exploratory surveys were conducted in Samarahan Division Sarawak in 1990-1991 to ascertain common weeds prevailing in rice field. Spatial patterns of weed species in five 1 m2 quadrats in each 87 farms were analysed. Three indices of dispersion (varience-to-mean ratio Lloyd's patchiness) and the Moran's I statistics of spatial autocorrelation were calculated. Weed species were almost exclusively composed of annuals dominated by Fimbristylis miliacea and 30 other principal species. These species exhibited aggregated distributions with Lloyd's mean crowding values ranging from 0.738 for Fuirena umbellata to 21.933 for Fimbristylis miliacea. Spatial autocorrelation values based on Moran's I statistics were found to be positive and significantly greater than (EI) at p 0.05 for 17 species thus suggesting aggregation or patchiness. The degrees of clustering for those species were highly irregular indicating that plants distribution is probably due to biological or agroclimatic factors
Additional Metadata
| Item Type: | Article |
|---|---|
| Additional Information: | Summaries (En Ms) |
| AGROVOC Term: | ORYZA SATIVA |
| AGROVOC Term: | PROCEDIMIENTO DE LA ENCUESTA |
| AGROVOC Term: | ANALISIS ESTADISTICO |
| AGROVOC Term: | MALASIA |
| AGROVOC Term: | MALEZAS |
| AGROVOC Term: | DISTRIBUCION NATURAL |
| AGROVOC Term: | ESPECIES |
| Depositing User: | Ms. Norfaezah Khomsan |
| Last Modified: | 24 Apr 2025 05:56 |
| URI: | http://webagris.upm.edu.my/id/eprint/20898 |
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