9 Sep 2019
Floating treatment wetland aided nutrient removal from agricultural runoff using two wetland species
Jonathan T. Spangler, David J. Sample, Laurie J. Fox, James S. Owen Jr (Virginia Tech) and Sarah A. White (Clemson University)
Floating treatment wetlands (FTWs) consist of rafts upon which wetland plants are grown. While FTWs have been found to reduce nutrients in runoff, data on commercial nurseries application is limited. We simulated FTW application to ponds collecting nursery runoff using Pontederia cordata and Juncus effuses in a mesocosm experiment. Pontederia cordata was clearly superior, removing more than 90% of total P and 84% of total N at high and low nutrient concentrations, respectively. Plant uptake transitioned from a slow establishment phase to maximum treatment after four to five weeks. This research demonstrates FTWs may provide effective treatment of nursery runoff.
Click here to read the research article
19 Aug 2019
Water Quality Characterization of Storm and Irrigation Runoff from a Container Nursery
Mohammad Nayeb Yazdi, David J.Sample, Durelle Scott, James S.Owen, Mehdi Ketabchy, and Nasrin Alamdari (Virginia Tech)
Runoff from container nurseries contains nutrient and sediment from fertilizer and irrigation. We assessed runoff total suspended solids (TSS), N as total N (TN), and P as total P (TP) from a 5.2 ha production area of a mid-Atlantic nursery. TN and TP storm loads were approximately 900, 35 and 50 times greater than irrigation loads. While TN and TP were comparable to urban runoff, TSS was 2-4 times greater. The Storm Water Management Model (SWMM) was calibrated to the results and used to generate annual TSS, TN, and TP loading, providing a valuable planning tool for nurseries.
Read the article here: https://doi.org/10.1016/j.scitotenv.2019.02.326
29 Jul 2019
Testing the Water
Neelam R. Redekar and Jennifer L. Parke (Oregon State University)
We describe a simple method that growers can use to test their irrigation water for Phytophthora. Rhododendron leaves or pear fruits are used to bait Phytophthora from the water source. If brown spots develop on the baits, detection of Phytophthora may be confirmed by using an inexpensive diagnostic test kit. We provide links to short videos on how to bait and how to use the test kits.
Read the article here http://www.diggermagazine.com/testing-the-waters/