《Table 2 Effects of different nitrogen fertilizer application modes on main agronomic traits of rape

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

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From Table 2，it is known that different nitrogen fertilizer application modes had different effects on main agronomic traits of rapeseed in different fertility soils.For the medium fertility soil，compared with no-fertilizer application group（control group），the plant height of rapeseed and the number of effective pods of main inflorescence in the fertilizer application treatments showed an increase trend.Specifically，the plant height of rapeseed with nitrogen fertilizer as the one-time application of nitrogen fertilizer as the base fertilizer was the highest，17.7 cm higher than that of the control group，the plant height of rapeseed with two times of application of nitrogen fertilizer was the lowest，12.8 cm higher than that of the control group，the number of effective pods of main inflorescence with three times of application of nitrogen fertilizer showed the highest increase，30.4 higher than that of the control group，while the number of effective pods of main inflorescence with two times of application of nitrogen fertilizer showed the lowest increase，18.5 higher than that of the control group.Compared with the control group，the effective length and the length of pod in the main inflorescence with nitrogen fertilizer treatment showed an significant increase trend，the length of main inflorescence with one time application of nitrogen fertilizer as the base fertilizer had the highest increase，9.6 cm greater than that of the control group，while the length of main inflorescence with two times of application of nitrogen fertilize had the lowest increase，5.8 cm greater than that of the control group；the length of pod in the main inflorescence with different nitrogen fertilizer treatments was basically the same；with the increase in the application times of nitrogen fertilizer，the length of pod in the main inflorescence in different treatments was 7.4，7.5，and 7.5 cm，respectively.In the treatments of fertilizer application，with the increase in the application times of nitrogen fertilizer，the effective branch height of rapeseed took on the trend of first rise then decline.For the one time application of nitrogen fertilizer as the base fertilizer，the effective branch height was 0.4 cm slightly lower than that of the control group，while the effective branch height with two times of application of nitrogen fertilizer was 10.5 cm higher than that of the control group；the number of primary branches showed the trend of first decline then rise.Specifically，the number of primary branches with one time of application of nitrogen fertilizer and three times of application of nitrogen fertilizer was the same，while the number of primary branches with two times of application of nitrogen fertilizer was basically the same as that of the control group.