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https://hub.ifdc.org/handle/20.500.14297/1435

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Browsing Presentations by Author "Christian O. Dimkpa"

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    Effects of Micronutrient on Productivity and Profitability of Rice under Three Growing Environments in Tanzania
    (2018) Kalimuthu Senthilkumar; Fitta Silas Sillo; B.J. Tesha; Ibnou Dieng; Jonne Rodenburg; Kazuki Saito; E. Vandamme; Christian O. Dimkpa; Wendt John; Bindraban, Prem S.
    Rice production in sub-Saharan Africa is often limited by nutrient deficiencies, necessitating the application of micronutrients along with NPK fertilizers to enhance and sustain yields. This study aimed to compare the efficiency and effectiveness of foliar and soil-applied micronutrients in rice production and analyze their cost-effectiveness. Thirty on-farm trials were conducted in three rice-growing conditions: irrigated lowland, rainfed lowland, and upland. Multiple treatments were applied, including five foliar nutrient products and one soil application of micronutrients per trial, under two blocks of NPK and no NPK. The results revealed significant yield increases with the application of micronutrients in rainfed and irrigated lowlands, but the effectiveness in upland conditions remained unclear. Soil application of micronutrients showed higher yield and economic benefits than foliar application, albeit at higher application rates. Therefore, in Tanzania's rainfed and irrigated lowland conditions, soil and foliar application of micronutrients can be recommended, but further studies are required for confirmation. The study also highlighted the variability in micronutrients' efficiency and cost benefits across different rice growing conditions. The findings emphasize the importance of considering site-specific factors and the choice of application method for optimizing rice production in Tanzania.
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    Nanoscale Elements Suppress Plant Disease, Enhance Macronutrient Use Efficiency, and Increase Crop Yield
    (2019-05) Jason C. White; Wade H. Elmer; Jorge L. Gardea-Torresdey; Christian O. Dimkpa
    The primary goal is to use nanoscale elements as an amendment strategy to suppress crop disease, improve nutritional content, and enhance yield. Soil pathogens significantly limit agricultural production, reducing crop yield by 10-20% and resulting in billions of dollars in annual losses. This shortfall in food production will worsen with a changing climate and an increasing population. Nanotechnology can play a critical role in maximizing global food production and achieving food security. Current approaches have focused on nano-enabled conventional agrichemicals, nanosensors, and waste treatment strategies. However, little is known about the effects of nanoparticle (NP) elements on disease suppression, macronutrient uptake, and crop growth. For example, micronutrients are pivotal in disease resistance through activation of defense barrier production and by affecting the systemic acquired resistance pathway. Unfortunately, element availability in soil is limited and foliarly applied micronutrients are not translocated to roots. Although NP intra plant translocation has been reported, there is no information on whether enhanced translocation of NP elements can deter root or shoot pathogens. Based on preliminary data, our central hypothesis is that NP nutrients can be used to strategically suppress disease, improve nutritional status and enhance crop growth and yield.