Progress 05/15/09 to 05/14/12
Outputs
Progress Report Objectives (from AD-416): To assess the agronomic benefits and environmental impacts of the PiNT product, an innovative nitrogen delivery technology developed by Plant Impact. Approach (from AD-416): PiNT will be evaluated in side-by-side comparisons with other commercial nitrogen fertilizers. Environmental losses by leaching will be assessed in controlled greenhouse column lysimeters studies. Corn yield response to increasing nitrogen rates will be assessed in plot studies. In a third trial on turfgrass, PiNT-K compared favorably to inorganic fertilizer analogs, but showed no significant benefits in comparison with urea-based fertilizers. Data from nitrogen fertilizer trials on corn during the 2011 growing season were analyzed. Results were highly variable due to drought conditions. There were no significant differences in corn grain or silage yields among plots fertilized with PiNT-Ca, PiNT- K, or urea ammonium nitrate (UAN). Reports of field observations of tomatoes grown with PiNT-Ca and PiNT-K suggest that plants grown with these nitrogen sources grow shorter and stockier and produce more fruit in comparison with plants grown under other nitrogen sources. However, a trial on cotton grown in the greenhouse and fertilized with PiNT-Ca, PiNT- K or urea showed no significant difference in plant height or other growth habit parameters. In general, no significant differences in plant growth response to PiNT fertilizers versus urea-based fertilizers could be documented. An incubation experiment comparing the persistence of amines in a high pH, low cation exchange capacity soil from Texas (Kermit series) showed no significant differences among soil treated with PiNT-Ca, PiNT-K, or UAN. Amines were completely converted to ammonium and nitrate within 28 days. Results show that amines in PiNT-Ca and PiNT-K are not stable in this soil under moist conditions.
Impacts
(N/A)
Publications
|
Progress 10/01/10 to 09/30/11
Outputs
Progress Report Objectives (from AD-416) To assess the agronomic benefits and environmental impacts of the PiNT product, an innovative nitrogen delivery technology developed by Plant Impact. Approach (from AD-416) PiNT will be evaluated in side-by-side comparisons with other commercial nitrogen fertilizers. Environmental losses by leaching will be assessed in controlled greenhouse column lysimeters studies. Corn yield response to increasing nitrogen rates will be assessed in plot studies. Field plots were established in 2010 comparing six nitrogen fertilizer sources, nitrous oxide emissions were measured weekly or twice weekly throughout the growing season, and corn grain yields were compared. Nitrous oxide emissions and grain yield were similar regardless of fertilizer source in 2010. Fertilizers applications were repeated in the spring of 2011 and gas emission measurements are currently being taken. Runoff boxes packed with soil collected from the University of Maryland Eastern Shore (UMES) Research and Teaching Farm and amended with seven N fertilizer and manure treatments were subjected to simulated rainfall. N losses in the form of ammonium, nitrate and urea were determined by flow injection analysis. Data are currently being summarized by a PhD candidate at UMES. Nitrogen leaching losses from fertilizer treatments were measured on intact soil cores collected from UMES, but variable background levels obscured differences among treatments. The study was repeated using columns packed with homogenized soil. Columns were pre- leached to reduce N levels in leachate to a minimum. Results showed that PiNT fertilizer behaved similar to urea in terms of N lost in leachate. However, total N recovery was less than 20% indicating that much of the N was retained in the soil, probably fixed by microbial growth and activity. A second nitrogen rate trial comparing PiNT to a nitrate fertilizer analog on turfgrass was completed. Results showed that PiNT at the 75 percent rate compared favorably to the nitrate fertilizer analog at the 100 percent rate with the added benefit that PiNT amended turf plots did not exhibit salt burn following application. A third trial on turfgrass designed to compare PiNT to other commercial fertilizers under a biweekly application management scheme is underway. A rate study of PiNT on corn that was established during the 2010 growing season showed that PiNT performed similar to UAN fertilizer in terms of yield, but slight differences in forage quality were observed. The study is being repeated in the 2011 growing year. A hydroponics study designed to evaluate the ability of various agronomic and horticultural plants to directly uptake and utilize the stabilized amine did not yield results due to gaseous losses of ammonia that complicated interpretation of the data.
Impacts
(N/A)
Publications
|
Progress 10/01/09 to 09/30/10
Outputs
Progress Report Objectives (from AD-416) To assess the agronomic benefits and environmental impacts of the PiNT product, an innovative nitrogen delivery technology developed by Plant Impact. Approach (from AD-416) PiNT will be evaluated in side-by-side comparisons with other commercial nitrogen fertilizers. Environmental losses by leaching will be assessed in controlled greenhouse column lysimeters studies. Corn yield response to increasing nitrogen rates will be assessed in plot studies. The desired result of sub-objective 1.2., �Evaluate sensor-based N management on corn yield and N use efficiency� is to reduce nitrogen leaching losses that flow to the Chesapeake Bay and other water bodies by improving nitrogen use efficiency. Through this project, the purported improved nitrogen use efficiency (30% less N application required) of the PiNT technology developed by Plant Impact plc. is being assessed, quantified and reported. PiNT is a cation-stabilized amine form of nitrogen fertilizer. One nitrogen rate trial comparing PiNT to a nitrate fertilizer analog on turfgrass was completed and the trial is being repeated in a second growing season. Preliminary results showed that PiNT at the 75 percent rate compared favorably to the nitrate fertilizer analog at the 100 percent rate with the added benefit that PiNT amended turf plots did not exhibit salt burn following application. A similar rate study of PiNT on corn was established during the 2010 growing season. Progress was made in a column leaching study that is designed to determine whether the stable amine in the PiNT formulation resists leaching. Leaching through columns filled and uniformly packed with thoroughly mixed soil is underway. Forty five soil column lysimeters were collected for use in evaluating leaching through undisturbed soil horizons following the conclusion of the leaching study on packed soil columns. Progress was made on a hydroponics study designed to evaluate the ability of various agronomic and horticultural plants to directly uptake and utilize the stabilized amine. Progress was monitored by participation in meetings among members of the scientific research team and representatives from Plant Impact on an as needed basis and by email exchange of data and information.
Impacts
(N/A)
Publications
|
|