Results 41 to 50 of about 622 (94)

不同施肥对双季稻田径流氮磷流失特征的影响

Shuitu Baochi Xuebao, 2017
通过定位试验，研究了不施氮肥（WN）、单施化肥（HF）、猪粪替代20%氮肥（ZF）、沼渣沼液替代20%氮肥（ZYF）、堆肥替代20%氮肥（DF）、早稻绿肥、晚稻稻草代替20%氮肥（LDF）6种不同施肥处理下双季稻径流氮磷含量和累积流失负荷的影响。结果表明，水稻基肥和追肥后，径流水中全氮、硝态氮、铵态氮、全磷和水溶性磷含量逐渐下降。HF处理双季稻季径流水中全氮、铵态氮、硝态氮平均含量最高，分别为5.91，3.65，0.82 mg/L。相比HF处理，有机物料替代20%氮肥处理能够降低径流水中全氮、铵态氮 ...
姜利红, 谭力彰, 田 昌, 刘 强, 张玉平, 杨 兰, 谢桂先   +6 more
doaj  

烤田对土壤中氮素和与氮有关的酶活性影响

Shuitu Baochi Xuebao, 2004
在水稻分蘖期对5种不同尿素氮肥水平的小区进行烤田5天的试验。试验结果表明,在烤田过程中,脲酶活性变化不明显,呈微弱增加趋势。硝酸还原酶活性急剧降低,羟胺还原酶活性呈波动变化,几乎检测不到亚硝酸还原酶活性。土表的铵态氮也呈波动变化,随着烤田时间的增加铵态氮含量降低。土表的硝态氮浓度不断增加,烤田增大了复水后硝态氮向地下水淋溶的趋势。施氮量越多,土表的矿质氮含量也越多。土壤烤田的主要目的是通过降低土壤的含水量,提高土壤的氧化还原电位,改善土壤的通气状况。
黄树辉 吕军
doaj  

Changes of folate constituents and contents in pakchoi as affected by nitrate to ammonium ratio in nutrient solution under hydroponic conditions. [PDF]

J Zhejiang Univ Sci B
Zhu Y, Cheng W, Ni Y, Ni W.
europepmc   +1 more source

A novel bacterial strain for the removal of ammonia nitrogen from wastewater: <i>Pseudomonas oleovorans</i> QS-7. [PDF]

J Zhejiang Univ Sci B
Qiu H, Liao M, Xie X, Lu X, Yuan F, Luo Z, Fan C.   +6 more
europepmc   +1 more source

[Research progress in the application of molecular imprinting technology in catalysis]. [PDF]

Se Pu
Ye WM, He DC, Cui XJ, Ma HW, Qian B, Shi F.   +5 more
europepmc   +1 more source

[Nitrosative stress promotes the malignant biological behavior of breast cancer through the glycolytic pathway]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Wang Y, Gong M, Zhu Y, Xu Y, Hu J, Luo C.   +5 more
europepmc   +1 more source

[Determination of five nitroimidazoles and six benzodiazepines in aquatic products using ultra-high performance liquid chromatography-tandem mass spectrometry coupled with dispersive solid-phase extraction]. [PDF]

Se Pu, 2022
Yang X, Wan Y, Huang H, Suo W, Xiao W, Li X.   +5 more
europepmc   +1 more source

[Fabrication of high-degradation-efficiency molecularly imprinted photocatalysts and its selective degradation performance]. [PDF]

Se Pu
Zhang JJ, Song YF, Liu Y, Tian XM, Gao RX.   +4 more
europepmc   +1 more source

[Progress in the metabolic and biotransformation of polycyclic aromatic hydrocarbons and their derivatives in humans]. [PDF]

Se Pu
Qian JK, He RM, Fang K, Li CL, Bao S, Gu W, Tang S.   +6 more
europepmc   +1 more source

[Alveolar nitric oxide concentration has a potential value in the diagnosis and differential diagnosis of interstitial lung diseases]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao, 2023
Chang X, Chen M, Liao H, Dong H, Cai S.
europepmc   +1 more source