Uptake efficiency of 15N-urea in flooded and aerobic rice fields under semi-arid conditions

Abstract

The sustainability of traditional rice (Oryza sativa L.) cultivation in many Asian countries is being questioned due to severe water shortage conditions, envisaging the need for development of water-saving rice production technologies. A 2-year-field study on a typic Haplustalf soil was conducted to compare traditional transplanted rice-maize system with water-saving aerobic rice-maize system, with an overall objective of investigating the fate of fertilizer nitrogen (N) using 15 N-labeled urea. Results from the field experiments showed that the rice plants positively responded to N fertilizer application. The average fertilizer N recovery by rice crop over the 2 years in aerobic rice was 26 kg per 100 kg of applied fertilizer N in the main field and 21 kg per 100 kg of applied N in the microplot, while the recoveries were 41 and 32 kg ha-1 per 100 kg of applied N in traditionally cultivated rice under flooded conditions. The fraction of 15 N that was found in soil after the harvest of rice crop ranged from 11.4 to 47.1 kg ha-1 in aerobic rice and 14.2-51.4 kg ha-1 in flooded rice. Average recovery of 15 N fertilizer in maize after the first growing season was 3.3 %, and the corresponding recovery in soil was 19 %. An additional 1.3 % of the fertilizer was recovered by crops during the two subsequent seasons. This study indicates the need to develop management practices that improve N use efficiency in aerobic rice by reducing losses to improve yields and reduce N export to the environment.

Apparent Recovery and Efficiency of Nitrogen Fertilization in Tomato Grown on Sandy Soils

“…Therefore, the low APR values that resulted in spring and fall show that soil N was able to contribute to the crop N requirement; and although APR values were similar among the N rates, the 150 lb/acre N rate was sufficient to help meet the crop N requirement. Kadiyala et al (2014) determined through a field study on rice (Oryza sativa) that the apparent N recovery decreased with increased rate of application N.…”

Tracking the Fate of Fertilizer Nitrogen in a Paddy Rice Field Using Isotope Technology

“…The rates and contents of nitrogen derived from fertilizer (N dff ) in water, plant and soil were calculated by Eqs. 4-9, respectively [29,33,37]. The nitrogen fertilizer efficiency was acquired by Eq.…”

“…15 N is another existent form of element nitrogen apart from 14 N. It has nearly the same physical and chemical characteristics as 14 N. When the 15 N tracer was applied into a specific ecosystem, the amount and distribution of 15 N in different environmental media (e.g. atmosphere, plant, microorganism, water and soil) could be quantified by using an isotope ratio mass spectrometer (IRMS) [27][28][29][30][31]. Therefore, 15 N tracing technology was widely applied to reveal the nitrogen behavior in the environment.…”

“…Therefore, 15 N tracing technology was widely applied to reveal the nitrogen behavior in the environment. For example, 15 N tracer has been used for screening the optimal manure and fertilization patterns and evaluating different types of paddy rice fields based on nitrogen uptake efficiency [29,[31][32][33]. In view of the advantage of isotope tracing technology and the above-successful case studies, it is theoretically feasible to more precisely quantitatively analyze the fate of fertilizer nitrogen.…”

Rice performance, water and nitrogen efficiency in different irrigation regimes in tropical lowland

“…In previous studies of the fate of 15 N fate applied to lowland rice, CF is largely reported as the irrigation regime which provides superior isotopic nitrogen efficiency in relation to alternative methods D ong et al, 2012;Fillery and Vlek, 1982; M. D. M. Kadiyala et al, 2015b;. The common factor between these studies was they took place on Alfisols and/or puddled soils.…”