TY - JOUR
T1 - Fertilizer equivalence of organic nitrogen applied in beef cattle manure
AU - Montealegre, Juan Pablo Garcia
AU - Wortmann, Charles
AU - Ferguson, Richard
AU - Shaver, Timothy
AU - Little, Richard
AU - Schepers, James
N1 - Funding Information:
Acknowledgements Funding was provided by Nebraska Corn Board (Grant No. 75309).
Funding Information:
Funding was provided by Nebraska Corn Board (Grant No. 75309).
Publisher Copyright:
© 2019, Springer Nature B.V.
PY - 2019/7/15
Y1 - 2019/7/15
N2 - The fertilizer N equivalent (FNE) value of applied organic N (OrgN) is poorly predicted, often resulting in over-application of fertilizer N. Research was conducted for irrigated, continuous-corn (Zea mays L.) in eastern Nebraska with three rates of beef (Bos taurus) feedlot manure as main plot treatments and five pre-plant fertilizer N rates as sub-plot treatments. The objective was to determine the FNE for the first, second and third successive crops following feedlot manure application with different rates of OrgN and fertilizer N application. The in-season FNE, based on normalized difference crop reflectance for the crop canopy, was less with 74 compared with 37 Mg ha−1 manure applied for crop one after application but the manure rate effect on the subsequent two crops was inconsistent. The mean cumulative full-season FNE, based on grain yield, for the three successive crops, was 0.72 kg N kg−1 OrgN which was twice the in-season estimate of 0.36 kg kg−1 at growth stage V12, indicating significant apparent recovery of OrgN after V12. The full-season FNE varied inconsistently with pre-plant fertilizer N rate and the three successive crops following application. The mean manure N recovery efficiency was 0.139 kg N kg−1 OrgN year−1 for the three crops following application with no significant treatment effects. Manure is a valuable source of N but the N supply is highly variable for the crops following application so prediction of supply for a given season is unreliable.
AB - The fertilizer N equivalent (FNE) value of applied organic N (OrgN) is poorly predicted, often resulting in over-application of fertilizer N. Research was conducted for irrigated, continuous-corn (Zea mays L.) in eastern Nebraska with three rates of beef (Bos taurus) feedlot manure as main plot treatments and five pre-plant fertilizer N rates as sub-plot treatments. The objective was to determine the FNE for the first, second and third successive crops following feedlot manure application with different rates of OrgN and fertilizer N application. The in-season FNE, based on normalized difference crop reflectance for the crop canopy, was less with 74 compared with 37 Mg ha−1 manure applied for crop one after application but the manure rate effect on the subsequent two crops was inconsistent. The mean cumulative full-season FNE, based on grain yield, for the three successive crops, was 0.72 kg N kg−1 OrgN which was twice the in-season estimate of 0.36 kg kg−1 at growth stage V12, indicating significant apparent recovery of OrgN after V12. The full-season FNE varied inconsistently with pre-plant fertilizer N rate and the three successive crops following application. The mean manure N recovery efficiency was 0.139 kg N kg−1 OrgN year−1 for the three crops following application with no significant treatment effects. Manure is a valuable source of N but the N supply is highly variable for the crops following application so prediction of supply for a given season is unreliable.
KW - Manure
KW - Nitrogen use
KW - Organic materials
KW - Organic N recovery
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U2 - 10.1007/s10705-019-10003-6
DO - 10.1007/s10705-019-10003-6
M3 - Article
AN - SCOPUS:85066787846
SN - 1385-1314
VL - 114
SP - 225
EP - 235
JO - Nutrient Cycling in Agroecosystems
JF - Nutrient Cycling in Agroecosystems
IS - 3
ER -