Effect of Nitrogen Application on the Dynamic Changes of the Seed Yield and Nitrogen Accumulation in Lolium multiflorum

PurposeTo find the best way of applying nitrogen (N) fertilizer for high seed yield of Lolium multiflorum.

MethodsThe effects of different N fertilizer combinations on the seed yield and N accumulation of L. multiflorum were studied by using incomplete block orthogonal design.

ResultThere were significant differences in the seed yield between different N application time and proportion (P<0.05), the treatment of 50 kg/hm² (autumn)+100 kg/hm² (early winter)+150 kg/hm² (spring) had the best effect on increasing yield, and the seed yield was 2523.6 kg/hm². Under the same total amount of N application, N of spilt application in autumn, early winter and spring could significantly improve seed yield. There was a significant linear relationship between N content and relative seed yield in three leaf stage, heading stage, flowering stage and mature stage. The regression equations were y=26.789x−52.937, y=64.652x−131.67, y=91.940x−146.610, y=91.763x−23.254, respectively; and the determination coefficients respectively were 0.8824, 0.7145, 0.8543 and 0.7170, reaching a significant level (P<0.05).

ConclusionBased on the application of N fertilizer in autumn and spring, increasing the application of N fertilizer in early winter can improve the seed yield of L. multiflorum.