Open AccessBenefits of alfalfa interseeding include reduced residual soil nitrate following corn production
Author(s) -
Osterholz William,
Ruark Matthew D.,
Renz Mark,
Grabber John H.
Publication year - 2021
Publication title -
agricultural and environmental letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.681
H-Index - 12
ISSN - 2471-9625
DOI - 10.1002/ael2.20053
Subject(s) - agronomy , nitrate , forage , leaching (pedology) , environmental science , medicago sativa , silage , biology , soil water , soil science , ecology
Interseeding alfalfa ( Medicago sativa L.) into corn ( Zea mays L.) silage can increase forage production, but the effects on soil nitrate pools remain unknown. We compared soil nitrate pools during and after interseeded alfalfa establishment in corn with pools during production of solo‐seeded corn followed by spring‐seeded alfalfa. Nitrogen (N) fertilizer was applied at three rates as a preplant broadcast or a 50:50 split between preplant broadcast and banded sidedress applications. During corn growth, soil nitrate levels from 0 to 30 cm were increased by higher N rates but were usually similar for both production systems. However, growth of interseeded alfalfa after corn harvest resulted in substantially lower residual fall and spring soil nitrate levels to a 90 cm depth, particularly under the highest N rate. Additionally, interseeded alfalfa influenced spring nitrate stratification by reducing nitrate in deeper horizons and increasing nitrate in the surface horizon. Interseeded alfalfa can thereby reduce the risk of nitrate leaching.