The effect of mineral N fertiliser and sewage sludge on yield and nitrogen efficiency of silage maize
J. Černý, J. Balík, M. Kulhánek, F. Vašák, L. Peklová, O. Sedlářhttps://doi.org/10.17221/538/2011-PSECitation:Černý J., Balík J., Kulhánek M., Vašák F., Peklová L., Sedlář O. (2012): The effect of mineral N fertiliser and sewage sludge on yield and nitrogen efficiency of silage maize. Plant Soil Environ., 58: 76-83.
A field experiment was conducted on a chernozem soil to estimate fertiliser N efficiency of silage maize (Zea mays L.) by the difference method as influenced by the type of N fertiliser (mineral-MF vs. sewage sludge-SS), and N rate. Eight N treatments were included (0, 60, 120, 180, and 240 kg N/ha prior to maize sowing, 60 kg N/ha at planting in MF; 120, and 240 kg N/ha in SS. The average dry mater (DM) yields were 11.2–14.8 t/ha. Average nitrogen uptakes were 88–185 kg N/ha, when the average N contents in DM were 0.8–1.25%. Nitrogen utilization efficiency (NUE) was a relatively stable value for treatments with MF. The best use of nitrogen from MF was reached by 60 and 120 kg/ha N doses. The average values of recovery efficiency of applied N (REN) were calculated as 41–57%. The use of SS increased the yield of silage maize by 19–25% compared to control, above all first and second year after their application. Mineral-fertilizer-N equivalents (MFE) for SS were calculated as 55 and 64%.
long-term field experiment; maize yield; nitrogen; N agronomic efficiency; N recovery efficiency; N uptake; N utilization efficiency