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Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers
Published on: March 21, 2016
Synergistic application of controlled-release urea and potassium chloride to enhance wheat yield and nutrient use
Xiuyi Yang1, Jianbang Li1, Wenxiao Zhang1
1College of Agriculture and Forestry Science, College of Resources and Environment, Linyi University, Linyi, Shandong, China.
Abstract:
Nitrogen and potassium fertilization played a central role in promoting the growth of wheat. A three-year (2022-2024) split-plot field experiment was conducted to investigate the impacts of combining controlled-release urea (CRU) with controlled-release potassium chloride (CRK) on nutrient leaching and use efficiency in wheat fields. In this study, the control plot received neither nitrogen nor potassium applications (Control). The main plots were designated based on nitrogen fertilizer types, including controlled-release urea (CRU) and conventional urea (Urea). The sub-plots were assigned potassium fertilizer rates using CRK, specifically 50 kg ha-1 (LCRK), 75 kg ha-1 (MCRK), and 100 kg ha-1 (HCRK). The wheat yields in CRU treatments witnessed a modest average increase of 2.2% from 2022 to 2024 compared to ordinary urea treatments. In the final season, nitrogen recovery efficiency augmented by 10.9%. Furthermore, CRU treatments boosted the number of wheat spikes and grains per spike but had no notable influence on the thousand-grain weight (TGW) of wheat. Consequently, the yield enhancement observed in CRU treatments was primarily attributed to an increase in tiller count of wheat. The application of CRU×MCRK modestly improved wheat leaf photosynthesis during its mid to late growth stages, nutrient use efficiency and potential environmental benefits.
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