摘要
通过大田试验研究了30%复合肥(15-7-8)不同施用量0、225、300、375、450、525、600、675 kg/hm^2对晚播油菜绿肥生物量、养分含量及累积量的影响,为确定晚播油菜绿肥适宜施肥量提供依据。结果表明,在晚播条件下,通过增加施肥量可以明显提高油菜绿肥的生物量及养分累积量,且随施肥量的增加,油菜地上部生物量及养分累积量呈增加趋势。与不施肥处理相比,施肥量在225~450 kg/hm^2范围内,油菜鲜、干重均随施肥量增加而提高,当施肥量>450 kg/hm^2时,各处理间油菜干重没有显著差异。当施肥量在525~675 kg/hm^2之间时,各处理油菜碳、磷、钾养分累积量没有显著差异,但施肥量在450~675 kg/hm^2之间时,各处理油菜碳、氮、磷、钾明显高于其他处理。结合油菜绿肥翻压还田时的生物量、养分归还量及肥料成本,本试验条件下油菜作为绿肥晚播的适宜施肥量为450~525 kg/hm^2。
A field trial was conducted to study the effect of fertilizing amount on biomass, nutrient content and accumulation of oilseed rape,to provide evidences for the appropriate fertilizing amount on late sowing oilseed rape. The trial included 8 fertilizing amount treatments 0,225,300,375,450,525,600,675 kg/hm2, the fertilizer was 30%（15-7-8） compound fertilizer. The results showed that under the condition of late sowing,by increasing the fertilizer rate could obviously increase oilseed rape biomass and nutrient accumulation,and which of them improved with fertilizer increased. Compared with control, oilseed rape fresh weight,dry weight increased with increasing fertilizing amount 225~450 kg/hm2. While there was no significant dif-ference on dry weights when fertilizing amount was great than 450 kg/hm2. When fertilizing amount 525~675 kg/hm2 in each processing there was no significant difference on C,P,K accumulation of oilseed rape,but C,N,P,K were significantly higher than other treatments. Combined with the biomass,nutrient returns when the oilseed rape returning into field and fertilizer costs,the most suitable fertilizing amount was 450~525 kg/hm2 for late sowing oilseed rape as green manure under this experi-mental condition.
出处
《湖北农业科学》
2017年第11期2028-2030,共3页
Hubei Agricultural Sciences
基金
国家油菜产业技术体系建设专项(CARS-13)
公益性行业(农业)科研专项(201503123)
关键词
油菜
绿肥
施肥量
生物量
养分累积量
oilseed rape
green manure
fertilizing amount
biomass
nutrient accumulation
