《Table 1 Effects of different treatments on growth of direct-seeding rape at wintering stage》

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《Effects of Nitrogen Application Rate and Seeding Density on Plant Growth and Seed Yield of Direct-seeding Rape》

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It could be seen from Table 1 that at wintering stage，increasing N application rate could promote the growth and development of rape，and under different seeding density levels，the plant height，rhizome diameter and maximum leaf length all increased with the increase of N application rate.Under the N application rate lower than 270 kg/hm2，there were very significant differences between different N application levels，while there were no significant differences between the 270 and 360 kg/hm2levels，indicating that the N application rate of 270 kg/hm2had already satisfied the demand for N element by the growth and development of plant.Though the leaf number，maximum leaf width and expansion all increased with the N application rate increasing under the different planting densities，but the variation trends were not accordant.Furthermore，under the same N application rate，the low seeding density treatment grew better，and the high seeding density treatment showed the poorest growth.The main reason might be that the increase of seeding density caused the decrease of N element acquired by individual plant and the reduction of growth space，and finally affected plant growth.