Effects of Irrigation on Seed Production of White Clover

The field was irrigated in winter and spring,the vegetative and reproductive growth of white clover was promoted effectively after irrigating.Moreover,soil water content was higher and ample moisture was supplied in peak flowering stage to increase seed yield.In the treatment of winter and spring irrigation,white clover coverage was 90.50%,canopy height was 13.50cm,aboveground biomass(dry) was 1269.09g/m2,underground biomass(dry) was 507.64g/m2,number of branch per unit area was 3012 branch/m2,number of inflorescence per branch was 3.29,number of floret per inflorescence was 96.25,seed yield was 578.10kg/hm2.Excepting number of branch per unit area and number of inflorescence,there was a significant difference in above items in comparison with winter irrigation and control(P 0.01),but it was no significant difference compared with spring irrigation treatment.