The University of Tokyo · Agricultural and Biological Sciences
Professor Syed Tahir Ata-Ul-Karim's research lab specializes in sustainable crop management, with a primary focus on precision nitrogen (N) nutrition in rice and wheat under changing climatic conditions. The lab investigates non-destructive diagnostic tools—such as chlorophyll meters and nitrogen dilution curves—to optimize fertilizer use and improve crop productivity in intensive cropping systems. Research spans both Japonica and Indica rice ecotypes, emphasizing ecotype-specific and universal models for nitrogen status assessment. The lab also examines the interactive effects of climate change and irrigation practices on crop performance, aiming to support climate-resilient agriculture.
Figures are computed from collected data and may differ slightly.
Non-destructive assessment of plant nitrogen (N) status is essential for efficient crop production and N management in intensive rice (<i>Oryza sativa</i> L.) cropping systems. Chlorophyll meter (SPAD-502) has been widely used as a rapid, non-destructive and cost-effective diagnostic tool for in-season assessment of crop N status. The present study was intended to establish the quantitative relationships between chlorophyll meters readings, plant N concentration (PNC), N nutrition index (NNI), a
The critical nitrogen (N) dilution curve is a suitable analytical tool for in-season estimation of N status to implement precision N management. This study was undertaken for a comprehensive comparison of N dilution curves in Japonica and Indica rice to investigate, whether a single curve can be used for both rice ecotypes and to determine the most robust plant index for assessing N status in rice ecotypes. The different N dilution curves were developed based on plant dry matter (PDM), leaf area
Global climate change associated with increasing temperature and unreliable rainfall events will have consequences for crop production. Therefore, strategizing crop management gained the attention of crop scientists to curtail the adverse impacts of climate change on crop production. However, the projected effects of climate change on wheat may vary in different cropping systems as wheat production is reported to be significantly impacted by future climate change in major cropping systems worldw
Plant analysis is a very promising diagnostic tool for assessment of crop nitrogen (N) requirements in perspectives of cost effective and environment friendly agriculture. Diagnosing N nutritional status of rice crop through plant analysis will give insights into optimizing N requirements of future crops. The present study was aimed to develop a new methodology for determining the critical nitrogen (Nc) dilution curve based on stem dry matter (SDM) and to assess its suitability to estimate the l
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