| Effects of nitrogen application rates and soil tillage modes on yield of spring maize and NO3- -N accumulation in soil profile |
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| DOI：10.7606/j.issn.1000-7601.2011.02.22 |
| Key Words: N application rate soil tillage yield of spring maize NO3- -N accumulation |
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| Abstract: |
| Based on N application rates and soil tillage modes experiment，yield of spring maize and NO3- -N ac-cumulation in soil profile were studied in the northwest of Hebei Province. The results showed that compared with conven-tional tillage，no-tillage mode had no significant effect on yield of spring maize，through analyzing function curve of N rate and yield of spring maize under no-tillage 1，no-tillage 2 and conventional tillage modes, and the proper rate of N of
spring maize was 192~209 kg/hm2，192~212 kg/hm2 and 196~216 kg/hm2 respectively. With the increase of N rate，NO3- -N accumulation in 0~90 cm and 90~80 soil layers were also significantly increased by three treatments. NO3- -N accumulation in 0~90 cm soil layer under no-tillage mode was higher than that under conventional tillage in whole sampling period, and this trend increased with increase of N application rate. After maize was harvested, NO3- -N accumulation in 0~90 cm soil layer under no tllale mode was significantly higher than that under conventional tillage mode, while NO3- -N accumulation in 90~180 cm soil layer under conventional tllage mode was significantly higher than that under no tllge mode，this indicated that more N mutrient accumulated in 0~90 cm soil layer under no tillage
mode and less leached into groundwater for environment pollution. |
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