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UID:0-7185@eng.ufl.edu
DTSTART;TZID=America/New_York:20250205T114500
DTEND;TZID=America/New_York:20250205T123500
DTSTAMP:20250114T144103Z
URL:https://www.eng.ufl.edu/news-events/events/w3-seminar-nitrogen-and-wat
 er-transport-in-a-rotational-production-system/
SUMMARY:W3 Seminar: Nitrogen and water transport in a rotational production
  system
DESCRIPTION:Abstract: \nThe use of nitrogen (N) fertilizers\, both organic 
 and inorganic\, poses a risk of nitrate-nitrogen (NO3-N) loading into the 
 environment\, which is a significant concern for regions like Florida aimi
 ng to meet Total Maximum Daily Load (TMDL) standards for NO3--N. This four
 -year study (2019-2022) at the North Florida Research and Education Center
 -Suwannee Valley (NFREC-SV) in Live Oak\, FL\, evaluated rotational produc
 tion as an advanced Best Management Practices (BMPs) to mitigate NO3--N po
 llution. The study compares the conventional maize (Zea mays) – peanut (
 Arachis hypogaea) and maize-carrot (Daucus carota) - peanut rotations with
  sod-based rotation involving two years of bahiagrass (Paspalum notatum) f
 ollowed by maize\, carrot\, and peanut across a 16 ha center pivot irrigat
 ed field. The study found sod-based rotation reduced NO3--N leaching by 27
  % for maize and 52 % for peanuts\, and increased N use efficiency by 9 % 
 in maize. However\, conventional rotation produced higher short-term crop 
 yields than sod-based rotation\, with maize yields showing an nRMSE of 7.5
  % and peanut yields showing an nRMSE of 8.7 %. The study also critically 
 compared the efficacy of passive-wick drainage lysimeters\, finding that t
 hey overestimated drainage volumes (median = 8.2 L) compared to the soil w
 ater balance approach (median = 1.7 L)\, highlighting the challenges of us
 ing lysimeters for deep drainage measurement in field conditions. Furtherm
 ore\, the study assessed three simulation models namely DSSAT (Decision Su
 pport System for Agrotechnology Transfer)\, HYDRUS-1D\, and SWAT (Soil and
  Water Assessment Tool). All the models showed a higher calibration accura
 cy. Both SWAT and HYDRUS 1D closely estimated NO3-N leaching during the ma
 ize growing season\, with HYDRUS-1D estimating 81 kg ha-1 and SWAT estimat
 ing 82 kg ha-1\, compared to the observed 110 kg ha-1 and DSSAT's estimate
  of 127 kg ha-1. The study highlights the potential of combining field obs
 ervations with simulation models to guide BMPs for effective environmental
  management in agricultural practices.\n\nBio: \nDr. Vivek Sharma is an As
 sistant Professor\, Precision Water Management Specialist in the Agricultu
 ral and Biological Engineering Department\, at University of Florida (UF).
  Dr. Sharma’s research and extension program is focused on the applicati
 on and development of precision agricultural water management technologies
  and strategies to (i) enhance/improve water and nitrogen use efficiency\,
  (ii) reduce agricultural water use\, and (iii) reduce the impacts of agri
 cultural management practices on downstream resources\, users and water qu
 ality. His work also investigates concepts of irrigation science and engin
 eering aiming towards the quantification of crop water use/evapotranspirat
 ion (ET)\, irrigation scheduling and requirements\, soil moisture sensing\
 , soil and crop growth dynamics\, crop water productivity (CWP)\, and impa
 ct of climate variables on agricultural productivity. The main idea of Dr.
  Sharma’s extension program is to provide leadership and encourage agent
 s and producers to adopt the basic\, advanced\, and newer technologies tha
 t will enable them to use and manage water resources efficiently and help 
 them to increase on-farm water use efficiency.\n\n\nDr. Sharma completed h
 is Ph.D. and M.S. in Agricultural and Biological Systems Engineering from 
 the Department of Biological Systems Engineering at University of Nebraska
 \, Lincoln in 2014 and 2011\, respectively. His undergraduate degree is in
  Agricultural Engineering from Punjab Agricultural University\, India. Bef
 ore joining UF\, Dr. Sharma worked as an Assistant Professor\, Irrigation 
 Specialist at University of Wyoming.
CATEGORIES:Seminars
LOCATION:Phelps Lab Room 101\, 1953 Museum Road\, Gainesville\, FL\, 32611\
 , United States
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=1953 Museum Road\, Gainesvi
 lle\, FL\, 32611\, United States;X-APPLE-RADIUS=100;X-TITLE=Phelps Lab Roo
 m 101:geo:0,0
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