Agronomic properties
The mineral N fertilizer had greater impact than PS on the average grain yield and plant N uptake from 2002 to 2011 (Table 3). This may reflect the differing application strategies, with PS45 applied once before sowing and mineral N split into two doses. PS45 applied before sowing was not used efficiently by the crop, suggesting a significant proportion of the N in PS45 is probably lost by volatilization in the 3e5 h before ploughing. The average temperature during application was 12e18 C depending on the year, and previous studies under these conditions suggest that 15e 50% of the N applied in PS45 could be lost by volatilization [43]. The emission of NH3 from animal manures during and after spreading depends on the temperature, humidity, precipitation and wind- speed, suggesting that the response of maize crops to different
Agronomic propertiesThe mineral N fertilizer had greater impact than PS on the average grain yield and plant N uptake from 2002 to 2011 (Table 3). This may reflect the differing application strategies, with PS45 applied once before sowing and mineral N split into two doses. PS45 applied before sowing was not used efficiently by the crop, suggesting a significant proportion of the N in PS45 is probably lost by volatilization in the 3e5 h before ploughing. The average temperature during application was 12e18 C depending on the year, and previous studies under these conditions suggest that 15e 50% of the N applied in PS45 could be lost by volatilization [43]. The emission of NH3 from animal manures during and after spreading depends on the temperature, humidity, precipitation and wind- speed, suggesting that the response of maize crops to different
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