晚播油菜绿肥适宜播种量研究

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/hm ²,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。

Study on the Appropriate Seeding Rate of Late Sowing Oilseed Rape as Green Manure

A field trial was conducted to study the effect of seeding rate on biomass, nutrient accumulation of Huayouza 62, to provide evidences for the appropriate seeding rate on late sowing oilseed rape. The trial included 10 seeding rate treatments ranging from 11.25 to 45.00kg/hm ². The results showed that the seeding rate had great effect on oilseed rape biomass and nutrient accumulation. Oilseed rape fresh weight, dry weight increased with increasing seeding rate ranged from 11.25-33.75kg/hm ². When the seeding rate was 33.75kg/hm ², a fresh weight of 24t/hm ² and a dry weight of 3.7t/hm ² were obtained. There was no significant difference on fresh and dry weights, however, once seeding rate was more than 33.75kg/hm ². The trend of C, N, P, K accumulation was consistent with the change of seeding rate and biomass of green manure oilseed rape. When the seeding rate was 33.75kg/hm ², the accumulation of C, N, P, K were 1 562.0kg/hm ², 56.7kg/hm ², 12.2kg/hm ² and 103.2kg/hm ², respectively. Equation simulation results showed that the C, N, P, K accumulation amount reached the highest when the seeding rate was 40.6kg/hm ², 40.5kg/hm ², 36.7kg/hm ² and 36.1kg/hm ², respectively. Comprehensive results showed that the most suitable seeding rate was 35-40kg/hm ² for late sowing oilseed rape as green manure under this experimental condition.