The effect of mineral N fertiliser and sewage sludge on yield and nitrogen efficiency of silage maize
2012
Cerny, J., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Balik, J., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Kulhanek, M., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Vasak, F., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Peklova, L., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin | Sedlar, O., Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Agrochemie a Vyzivy Rostlin
A field experiment was conducted on a chernozem soil to estimate fertiliser N efficiency of silage maize 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 N 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 N from MF was reached by 60 and 120 kg/ha N doses. The average values of recovery efficiency of applied N 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 for SS were calculated as 55 and 64%, resp.
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