摘要
采用田间实验研究了施用氮肥对设施条件下大青菜生长发育和产量，以及对土壤硝酸盐含量累积分布的影响。结果表明，在施氮肥0—500kg hm^-2范围内，氮肥施用量越大，产量越高，但到达一定量时，便不能再促进产量的提高，反面会引起减产。土壤铵态氮含量随着土壤剖面向下不断下降，表层的铵态氮含量较高，土壤硝态氮含量在整个土壤剖面的分布变化较小，但也是从表层向下处于一种缓慢减少的趋势，铵态氮的累积主要集中在上部土壤剖面，硝态氮的累积分布在整个土壤剖面，土壤硝态氮含量随施肥量增加面增加；氮肥施用量对硝酸盐含量有很大影响。在施氮肥0—700kg hm^-2范围内，氮肥施用量越多，大青菜硝酸盐含量越高。
The effect of nitrogen fertilization on green vegetables growth and yield and the soil nitrate nitrogen and ammonium nitrogen accumulation was studied in a sunlight greenhouse in the loess plateau area. The result indicated that the yield of garden sass increased at the nitrogen fertilizer application of 0 -500 kg hm^-2 ,but the yield decreased at 700 kg hm^-2. Ammonium nitrogen accumulation decreased along with the soil depth. The content of soil nitrate changed slightly from 0 to 100 cm in the soil profile, but the content of ammonia accumulation changed considerably. Ammonia was accumulated in 0 -40cm in the soil profile and soil nitrate was accumulated in the whole soil depth profile. The nitrogen fertilizer application rate had very significanfl effect on the nitrate content in garden sass. Within the nitrogen fertilizer application rate （0 -700 kg hm^-2）, the more nitrogen fertilizer application rate, the greater content of nitrate in garden sass was found.
出处
《土壤通报》
CAS
CSCD
北大核心
2006年第5期924-927,共4页
Chinese Journal of Soil Science
基金
中国科学院水土保持研究所领域前沿(C23013900)
国家863项目(2002AA2Z4211)资助
关键词
硝酸盐
大青菜
氮肥
设施农业
Nitrate
Garden sass
Nitrogen fertilizer
Facilities condition
