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AN ASSESSMENT OF NITROGEN UTILIZATION IN CONTINUOUS CORN (NEBRASKA)
Abstract
A continuous corn rotation study was initiated in 1912 at Scottsbluff, Nebraska, on a Tripp very fine sandy loam (Aridic Haplustoll). In 1942, manuring was started on half of the plot area and has continued to the present at a rate of 27 metric tons/ha. In 1953, N fertilization of both manured and non-manured treatments began at 5 rates (0, 45, 90, 135, and 180 kg N/ha as NH(,4)NO(,3)). In the spring of 1980, depleted N-15 fertilizer N was applied. Soil samples were collected to a depth of 15 m to determine leaching losses of NO(,3)('-)-N. Soil samples were also collected for the top 300 mm for characterization. Plant samples were taken at the six leaf and silking stages and at harvest to determine N uptake and N fertilizer use efficiency (NFUE). Balance sheets for 1980 and the period 1942 to 1980 were developed for both manured and non-manured treatments. Unaccounted for N losses varied from 0 to 48% of the applied fertilizer and manure N and was assumed to be primarily due to gaseous losses. Several N availability indexes were compared and the correlations with N uptake and grain yield were determined. It was determined that a model with autoclave-mineralizable N and soil NO(,3)('-)-N level (1800 mm depth) was the best predictor of both N uptake ad grain yield. Approximately 89 to 100% of the laboratory derived mineralizable N value was taken up by the corn crop in 1980.
Subject Area
Agronomy
Recommended Citation
LUEKING, MARY ANN, "AN ASSESSMENT OF NITROGEN UTILIZATION IN CONTINUOUS CORN (NEBRASKA)" (1983). ETD collection for University of Nebraska-Lincoln. AAI8404816.
https://digitalcommons.unl.edu/dissertations/AAI8404816