Soil nutrient status as influenced by fallow, tillage and nitrogen management in rainfed lowland rice condition

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Research Paper 01/08/2020
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Soil nutrient status as influenced by fallow, tillage and nitrogen management in rainfed lowland rice condition

Andrea F Dawan, Ricardo B Casauay, Gerald L Seridon
J. Bio. Env. Sci.17( 2), 22-31, August 2020.
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This field experiment was conducted for two cropping seasons to evaluate the effects of fallow and tillage managements in rainfed lowland rice and on the soil chemical properties especially on soil organic matter (SOM). Fallow managements which are mowing and leaving rice stubbles during fallow period were assessed. Effects of conventional and zero-tillage and nitrogen fertilizer managements were also determined. Generally, fallow and tillage managements have no effect on soil C:N ratio, and on other soil chemical properties after two cropping seasons. However, notable increase in OM after two cropping seasons was observed due to the decomposed 30% threshed rice straw that were incorporated in the soil during fallow period. Increased SOM is also very evident since the soil has very low baseline OM content. In terms of grain yield, fallow- and tillage-managed plots did not vary significantly but for nitrogen fertilizer managed plots, significant effects were noted for two cropping seasons. Full-N applied plots have significantly higher yields compared with half-N and 0-N. The soil indigenous nitrogen supply (0-N plots) could not satisfy the need of the crop throughout its growing period. For tillage practice, rice under deep tillage produced significantly higher plants and grain yield during the second cropping season. This is due to higher OM content noted in these plots compared to zero-tilled plots, although the difference is not significant. Nevertheless, improvement of fallow and tillage management may lead to improved soil properties and increased yield of rice in the long term.


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