1a.Objectives (from AD-416):
To determine the response of corn to endogenous ethylene produced during specific growth stages during water stress.
1b.Approach (from AD-416):
1. Plot size: 6 rows by 10 m, with two row buffers between plots
a. Replicated 8 times
2. Corn Variety: Dekalb 5259 triple stack
3. Irrigation Levels
b. 100% ET until the V6-V7 growth stage
1). Withhold water until leaves begin to curl in the middle of the day.
2) Apply 25 g/ha of 1-MCP
3) Remain under water stress for 7-10 d after application
4) 100% ET for the rest of the season.
4. 1-MCP application rate: 25 g a.i./ha applied in 200 l/ha with appropriate surfactant as designated by cooperator.
a. Plant height (internode length) (early application timing only)
b. Leaf elongation (hand measures of leaf length and width and/or NDVI)
c. Transpiration (Porometry)
d. Gas exchange (CO2 and H2O) every day after application and 3 weeks after drought is relieved.
e. Rate of senescence (SPAD of leaf above ear leaf and leaf below ear leaf– regular intervals; or canopy level multispectral analysis)
f. Yield of middle 2 rows of each plot
g. Yield components (kernel #/ear; 1000 kernel wt. test weight, etc.).
This project was completed in 2013 and a final report submitted to AgroFresh. In the final year we applied 1-MCP (25 g/ha) to corn in the V-10 growth stage when it began to show leaf curling in the middle of the day. A time-lapse camera was set up to monitor leaf curling during the day for 10 days following the application of 1-MCP and yield was taken at the end of the growing season. There was no apparent plant response to the application of 1-MCP and there was no difference in yield between the treated and untreated plots. This study concluded a multi-year project on the potential for 1-MCP to mitigate the drought response in corn. Unfortunately no positive responses on yield were ever documented.