Title

Agronomic, economic, and ecological response of corn and soybean production systems to winter cover cropping and minimum tillage management in the Mississippi Alluvial Valley

Advisor

Czarnecki, Joby M.

Committee Member

Baker, Beth

Committee Member

Krutz, L. Jason

Committee Member

Smith, Brian K.

Date of Degree

12-1-2020

Original embargo terms

Visible to MSU only for 2 years||12/15/2022

Document Type

Graduate Thesis - Open Access

Degree Name

Master of Science

Abstract

Winter fallow corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] production systems are susceptible to erosion and agrochemical transport. This research determined the effects of Cover Crop Minimum Tillage (CCMT) on erosion and agrochemical transport from corn-soybean rotations at field scale, while assessing impacts to agroeconomics and irrigation in Mississippi’s Delta Region. CCMT did not affect total suspended solids (p = 0.53), total inorganic phosphorus (TIP) (p = 0.30), or total nitrogen (TN) (p = 0.25) loads, but did reduce TIP (p = 0.018), TN (p = 0.011), and nitrate-nitrite (p = 0.007) concentrations. An economic loss of $281/ha with no effect on yield (p = 0.09), irrigation use efficiency (p = 0.38), or consumptive water use (p = 0.83) was observed. CCMT will not improve profitability of corn-soybean rotations in the Delta and transitioning from fallowing to CCMT will have varying effects on erosion and agrochemical transport.

URI

https://hdl.handle.net/11668/20833

Sponsorship

USDA-NIFA CARE program, award #2016-08477

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