Perspective on oil flax yield and dry biomass with reduced nitrogen supply

摘要

Field experiment was arranged in a randomized complete block design to determine effects of nitrogen(N)application levels(J0:150 kg/hm^2,J1:120 kg/hm^2,J2:90 kg/hm^2,J3:60 kg/hm^2)on regulating dry biomass accumulation,allocation and translocation,and grain yield of oil flax during 2018 cropping season.Significant promotion was observed in dry matter during accumulation stage of oil flax,when N rate was reduced by 40%(from 150 to 90 kg/hm^2).Under J2 treatment,translocation of dry matter from vegetative organs to pod increased by 38.46%and 61.54%respectively,when compared with J1 and J0 treatment Dry matter distribution proportion of pod at maturity increased 4.47%-7.61%,contribution rate of leaf to grain upgraded 5.09%-8.77%,and number of effective pods and grains per pod increased by 27.16%-45.38%and 6.49%-26.59%respectively compared to other treatments.As a result,seed yield of oil flax under J2 treatment was 2.23%-18.21%higher than those of other treatments.Our study recommended 90 kg/hm^2 as the best N fertilizer level to improve seed yield of oil flax.