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以华油杂62为试验材料,通过田间试验研究了10个播种量(11.25~45.00kg/hm~2)对油菜绿肥生物量和养分积累量的影响,为确定晚播油菜绿肥适宜播种量提供依据。结果表明,不同播种量明显影响油菜生物量及养分累积。当播种量在11.25~33.75kg/hm~2,油菜鲜、干重均随播种量增加而提高,播种量为33.75kg/hm~2时,油菜鲜重为24t/hm2,干物质量为3.7t/hm~2;当播种量>33.75kg/hm~2时,各处理间油菜生物量没有显著差异。油菜绿肥C、N、P、K养分累积量随播种量的变化趋势与生物量一致,当播种量为33.75kg/hm~2时,C、N、P、K养分累积量分别为1562.0、56.7、12.2、103.2kg/hm~2;方程模拟结果表明,C、N、P、K累积量达到最高值时所对应的播种量分别为40.6、40.5、36.7和36.1kg/hm~2。综合结果显示,本试验条件下油菜绿肥晚播时的适宜播种量为35~40kg/hm~2。
The effects of 10 sowing rates (11.25 ~ 45.00kg / hm ~ 2) on biomass and nutrient accumulation of green manure in rapeseed were studied in a field trial with field experiments of Huayaoza 62 as the experimental material. in accordance with. The results showed that different seeding rates significantly affected rape biomass and nutrient accumulation. When the seeding rate was 11.25 ~ 33.75kg / hm ~ 2, the fresh and dry weight of rapeseed increased with the increase of seeding rate, the fresh weight of rapeseed was 24t / hm2 when the seeding rate was 33.75kg / hm ~ 2 and the dry weight was 3.7t / hm ~ 2; when sowing rate> 33.75kg / hm ~ 2, there was no significant difference in rapeseed biomass among treatments. The accumulative amount of C, N, P and K of rapeseed green manure increased with the change of sowing amount in the same biomass. When the seeding rate was 33.75kg / hm ~ 2, the cumulants of C, N, P and K were 1562.0 and 56.7 , 12.2 and 103.2kg / hm ~ 2 respectively. The simulation results of the equation showed that the corresponding sowing rates of C, N, P and K reached 40.6, 40.5, 36.7 and 36.1 kg / hm ~ 2, respectively. The comprehensive results showed that the appropriate seeding rate of rapeseed green manure was 35 ~ 40kg / hm ~ 2 at late sowing time.