《Table 1 Effects of different nitrogen fertilizer application modes on yield of rapeseed in differen

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《Optimum Application Time and Application Rate of Nitrogen Fertilizer in Brassica napus L.》

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Note:Different small letters in the same column indicate significant difference at 0.05 level.

The 1 000-grain weight，number of grains per pod，and number of effective pods per plant are three key components of rapeseed yield.As can be seen from Table 1，compared with the no fertilizer application group（control group），the number of effective pods per plants showed an increasing trend in both fertility soils，and with the increase in nitrogen fertilizer application times，there was similar dynamic changes.When the nitrogen fertilizer was applied as the base fertilizer and wintering fertilizer at the ratio of 7∶3，the number of effective pods per plants was the smallest；when the nitrogen fertilizer was applied as the base fertilizer，wintering fertilizer，and bud fertilizer at the ratio of 5∶3∶2，the number of effective pods per plants reached the largest.In other words，treatments with the largest number of effective pods had the same application mode of nitrogen fertilizer in different fertility soils，and treatments with the smallest number of effective pods also had the same application mode of nitrogen fertilizer in different fertility soils.In the fertilizer application treatment，with the increase in the nitrogen application times，the number of grains per pod of rapeseed in two different fertility soils showed a similar decreasing trend，both showed the largest number of grains per pod in onetime treatment of base fertilizer application，the smallest number of grains per pod in two times of topdressing treatments，but there were certain differences in the specific dynamic changes.The analysis of the 1 000-grain weight of rapeseed showed that in the fertilizer application treatment，the 1 000-grain weight in the two different fertility soils was the highest in the one time topdressing treatment；however，the 1 000-grain weight of the rapeseed in the medium-fertility soil was the lowest among the two times of topdressing treatments，and the 1 000-grain weight of rapeseed in low fertility soil was the same in one time base fertilizer application and two times of topdressing treatments.These indicated that dynamic changes of rapeseed yield components in two different fertility soils had similarities and also different characteristics.