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Microplot Design for Determining Corn Recovery of Nitrogen Fertilizer Applied in the Row
Author(s) -
Blaylock A. D.,
Benjamin J. G.,
Cruse R. M.
Publication year - 1990
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1990.03615995005400030054x
Subject(s) - loam , agronomy , stover , tillage , fertilizer , mollisol , mathematics , silt , environmental science , soil water , field experiment , biology , soil science , paleontology
One‐ and three‐row corn ( Zea mays L.) microplots were compared for determining 15 N‐depleted fertilizer recovery from in‐row N applications. Studies were conducted with Iowa ridge‐tillage systems on Monona silt loam (fine‐silty, mixed, mesic Typic Hapludoll), Webster silty clay loam (fine‐loamy, mixed, mesic Typic Haplaquoll), and Marna silty clay loam (fine, montmorillonitic, mesic Typic Haplaquoll). Corn rows were injected with 15 N‐depleted NH 4 NO 3 (99.99% 14 N) at 56 and 112 kg N ha −1 on Monona silt loam and at 67 and 157 kg N ha −1 on Webster and Marna silty clay loams. Percentage N from fertilizer in the mature‐plant samples ranged from 19.8 for grain fertilized at 56 kg N ha −1 to 50.0 for stover at 157 kg N ha −1 . One‐ and three‐row microplots were not significantly different for determining corn N recovery in the application year from in‐row N placements.