硝态氮肥

而以硝态氮肥为氮源时，玉米叶片硝态氮含量和全氮含量最高。

In nitrate fertilizer sources , the contents of nitrogen and nitrate in maize were highest .

用静态箱法在田间研究了黄土性土壤不同水分条件下施用硝态氮肥和铵态氮肥后土壤N2O的排放特点，并对包括温度、pH、水分等因子的影响进行了探讨。

Based on field experiment the effects of nitrogen fertilizer types on N_2O emissions and influential factors were studied under two different soil water conditions on the loess soil .

研究了铵态氮肥（NH4）2SO4、硝态氮肥NaNO3及硝化抑制剂双氰铵（DCD）对叶菜用甘薯光合特性、茎叶产量以及硝酸盐含量的影响。

This paper studied the photosynthetic , edible-vine yields and nitrate accumulation of vine-vegetable sweetpotato character by using the ( NH_4 ) _2SO_4 , NaNO_3 and Nitrification inhibitor DCD .

与滴灌施用硝态氮肥相比，施用铵态氮肥和尿素后在培养期间土壤矿质态氮（NO-3-N+NH+4-N在土壤中的固定、挥发等有关。4-N）的含量有降低的趋势，降低的原因可能与NH+

The content of mineral nitrogen content ( NH ~ + _4-N + NO ~ - _3-N ) decreased during the incubation period after applying NH ~ + _4-N fertilizer and urea . It might be related to the occurrence of NH ~ + _4-N fixation and volatilization .

结果表明，不同氮肥类型和施氮量对叶菜用甘薯植株叶绿素含量及光合特性均有显著影响，其中硝态氮肥对叶绿素a含量、光合速率的影响大于铵态氮肥。

The results showed that there was a significant effect of applied nitrogen amount and nitrogen type on photosynthetic character and chlorophyll content .

氮肥形态及施用方式的盆栽试验研究表明，石灰性土壤上施用硝态氮肥菠菜生长量大，硝态氮累积量低；

Pot experiments was carried out for studying the effect of different nitrogen fertilizer forms and application methods on growth and nitrate accumulation of spinach .

1996～1997年连续二年进行了固定氮素用量，改变铵态、硝态氮肥的施用比例试验，对烤烟的一些光合生理特性进行了研究。

Some photosynthetic characteristics in Flue cured tobacco were studied in a field experiment conducted during 1996 ~ 1997 with the application of fixed nitrogen levels and various proportions of different nitrogen forms .

硝、铵态氮肥对旱地土壤氧化亚氮排放的影响亚硝态氮对鲤鱼种血液SOD及GSH-Px的影响

Effects of nitrogen types on N_2O emissions of dry-land soil Activity of SOD and GSH-Px in the Blood of Fingerling Cyprinus carpio under Different Nitrite Concentration

叶菜类蔬菜不同部位的硝态氮累积对氮肥的响应

Response of Nitrate Accumulation in Different Parts of Leafy Vegetables to Nitrogen Supply

而挑旗期土壤硝态氮含量与氮肥分期施用处理无显著差异，但提高了土壤铵态氮含量；

Applying fertilizer nitrogen at flagging stage had no significant difference with split application in soil NO_3 ~ & N content , but increased soil NH_4 ~ + - N content .

结果表明：施用氮肥明显提高土壤与植株中硝态氮含量，一定范围内土壤/植株硝态氮含量随氮肥用量的增加呈上升趋势；

The main results were as follows : Applying nitrogen fertilizer raised nitrate-N content either of soil or of plant tissue , and the nitrate-N content increased by increasing nitrogen rate ;