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• W2296598436 abstract "The N requirement for paddy rice cultivated in Bangladesh amounts to approximately 80 kg N ha-1. Lack of knowledge on N mineralization from soil organic matter (SOM) leads farmers to fill up this N requirement exclusively by costly mineral fertilizers, which have typically an efficiency of less than 40%. After decades of searching for a practical tool to estimate the N mineralization capacity of soil, there is still no consistent methodology. This PhD aimed to assess routinely analyzed soil parameters, different physical and chemical fractions of soil organic matter (SOM) and lastly enzyme activities as predictors for the net N mineralization in Bangladeshi paddy soils. Soils were collected from 25 farmers’ fields and two long term field experiments on contrasting soil types, namely on a highly weathered ‘terrace soil’ and on a younger ‘floodplain soil’. Fertilizer management had a significant but contrasting impact on soil N mineralization within both long-term experiments. Bio-availability of N increased in the terrace soil experiment with increasing soil N content, logically in relation to application of fertilizers and organic amendments. On the contrary there was a relatively stronger stabilization of soil N against anaerobic mineralization with higher paddy soil N and C contents in the floodplain experiment and in the set of farmers’ fields. We further investigated SOM quality through physicochemical fractionation of the SOM. In the terrace soils experiment some of the physicochemical SOM fractions were found useful predictors for both aerobic and anaerobic N mineralization. However, none qualified as predictor of anaerobic N mineralization for the floodplain experiment and the set of farmers’ fields. An novel fractionation procedure with sub-critical water extraction yielded a similar limited outcome as for none of the isolated subcritical water extracts the N contents correlated with the anaerobic N mineralization rate. Finally we measured three enzyme activities relevant to N cycling in soil and all were found to be significantly influenced by management. Over all investigated soil parameters in this PhD research L-glutaminase activity was found to be the most useful predictor for the anaerobic N mineralization rate." @default.
• W2296598436 created "2016-06-24" @default.
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• W2296598436 date "2012-01-01" @default.
• W2296598436 modified "2023-09-24" @default.
• W2296598436 title "Nitrogen mineralization in subtropical paddy soils in relation to soil properties, organic matter fractions, and fertilizer management" @default.
• W2296598436 hasPublicationYear "2012" @default.
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