Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:6.3.4.6 (
urease
)
7,490
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Hydrochar, as a product of the hydrothermal carbonization of biomass, has good application prospects for the NH
3
volatilization reduction in rice fields due to its rich pore structure and functional surface. In this study, hydrochar was applied as a soil conditioner to paddy soil. A soil column experiment was conducted to investigate the effect of hydrochar on NH
3
volatilization throughout the growth period of rice. The experiment was conducted with three treatments:CKU (control without hydrochar);
SHC
(sawdust hydrochar); and W-
SHC
(water-washed sawdust hydrochar). The application rate of
SHC
and W-
SHC
was 0.5% (
w/w
). The study investigated the effects of different hydrochars on the pH and concentrations of NH
4
+
-N in floodwater, the flux and accumulation of NH
3
volatilization, and the yield-scale cumulative emission of NH
3
volatilization. Results show that the
SHC
treatment significantly reduces cumulative emissions of NH
3
volatilization and the yield-scale cumulative emissions of NH
3
volatilization (
P
<0.05), which were 32.42% and 47.61% lower than CKU, respectively. The effect of W-
SHC
on ammonia volatilization reduction was slightly weaker, as the cumulative emissions of NH
3
volatilization and the yield-scale cumulative emissions of NH
3
volatilization decreased by 10.14% and 27.71%, respectively, compared with CKU. The NH
3
volatilization reduction was possibly related to the disturbance of pH and the decrease in NH
4
+
-N concentrations in the floodwater because of the application of hydrochar. Compared with CKU, both
SHC
and W-
SHC
treatments reduced the pH and NH
4
+
-N concentration in the floodwater. The impacts were more obvious in the rice base fertilizer period (BF) and the first supplemental fertilizer period (SF1) than in the second supplemental fertilizer period (SF2). The soil
urease
activity was significantly inhibited by hydrochar (
P
<0.05), and the abundance of soil ammonia-oxidizing gene (AOA, AOB) also significantly increased after application of
SHC
(
P
<0.05). This resulted in the enhanced efficiency of ammonia-oxidizing, which had an effect on the reduction of the NH
4
+
-N concentrations in the floodwater. This study provides theoretical and experimental data support for the application of hydrochar in agro-environments with regard to ammonia volatilization reduction in paddy fields.
...
PMID:[Effect of Applying Hydrochar for Reduction of Ammonia Volatilization and Mechanisms in Paddy Soil]. 3260 54
