Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Czarnecki, Joby M.

Committee Member

Baker, Beth

Committee Member

Krutz, L. Jason

Committee Member

Smith, Brian K.

Date of Degree

11-25-2020

Original embargo terms

Visible to MSU only for 2 years

Document Type

Graduate Thesis - Campus Access Only

Major

Agronomy

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

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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