摘要
采用恒温培养和盆栽生物试验研究了非包膜缓释复合肥料对土壤氮素养分(铵态氮、硝态氮、碱解氮、微生物量氮和固定态铵)和黑麦草氮素营养的效应。结果表明,在恒温培养条件下,各施肥处理土壤铵态氮含量随培养时间均表现为先升高后降低的趋势,且中后期缓释复合肥料处理(SRCF)高于普通复合肥料处理(CCF);缓释复合肥料SRCF1处理土壤硝态氮含量始终低于普通复合肥料CCF1处理,缓释复合肥料SRCF2处理土壤硝态氮含量在初期较高、中后期较低;SRCF各处理土壤碱解氮和微生物量氮含量变化均表现为增加-降低-增加-降低趋势,分别在培养第21d和105d时出现峰值;土壤固定态铵含量变化较小,但总体上以SRCF处理高于CCF处理。在等养分比例盆栽试验中,SRCF1-3处理黑麦草株高、生物量、干重和氮素养分吸收量均高于CCF1处理,SRCF有利于提高黑麦草产量、氮素吸收和利用率;黑麦草氮素吸收量与培养土壤铵态氮、微生物量氮含量呈负相关,而与硝态氮和固定态铵含量呈正相关。
Soil incubation and pot-experiment methods were used to study the effects of uncoated slow-release compound fertilizer （SRCF） on forms of soil nitrogen （NH4＋-N,NO3--N,alkali-hydrolysis N,microbial nitrogen and fixed-ammonium） and nitrogen content of ryegrass.The results indicate that the trend of soil NH4＋-N in CCF （common compound fertilizer） and SRCF treatments has uni-modal curve.Soil NH4＋-N in SRCF is higher than that in CCF treatment in the middle and final incubation period.However,soil NO3--N in SRCF1 is lower than that in CCF1 treatment.Also soil NO3--N in SRCF2 is higher in the early incubation period and lower in the latter period than that in CCF1 treatment.The trend of alkali-hydrolysis N and soil microbial nitrogen （SMBN） in SRCF treatments exhibits a di-modal curve,with peaks respectively appearing on the 21st and 105th day of incubation.Variations in soil fixed-ammonium are consistent and minimal.Soil ammonium fixation in SRCF is higher than that in CCF treatment.The height,biomass,dry-weight and nitrogen content of ryegrass in SRCF1-3 treatment are higher than those in CCF1 treatment.In comparison with CCF,SRCF treatment is more suitable in terms of ryegrass nitrogen uptake and yield under the same nutrient conditions.Ryegrass nitrogen uptake is negatively correlated with soil NH4＋-N and SMBN.It is,however,positively correlated with NO3--N and fixed-ammonium.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2010年第5期929-933,共5页
Chinese Journal of Eco-Agriculture
基金
国家科技支撑计划项目(2007BAD87B10)
科技部农业科技成果转化资金项目(2007GB2F100266)
国家高技术研究发展计划(863计划)项目(2004AA246020)资助
关键词
缓释复合肥料
土壤
氮素形态
黑麦草
氮素利用率
Slow-release compound fertilizer
Soil
Nitrogen form
Ryegrass
Nitrogen use efficiency
