Effects of slow-release urea fertilizers on urease activity, microbial biomass, and nematode communities in an aquic brown soil

2005 ◽  
Vol 48 (S1) ◽  
pp. 26-32 ◽  
Author(s):  
Xiaoguang Jiao ◽  
Wenju Liang ◽  
Lijun Chen ◽  
Haijun Zhang ◽  
Qi Li ◽  
...  
Keyword(s):  
Microbial Biomass ◽  
Urease Activity ◽  
Slow Release ◽  
Nematode Communities ◽  
Brown Soil ◽  
Aquic Brown Soil ◽  
Slow Release Urea

Nematode faunal analysis in an aquic brown soil fertilised with slow-release urea, Northeast China

2005 ◽  
Vol 29 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Wenju Liang ◽  
Qi Li ◽  
Yong Jiang ◽  
Deborah A. Neher
Keyword(s):  
Northeast China ◽  
Slow Release ◽  
Faunal Analysis ◽  
Brown Soil ◽  
Aquic Brown Soil ◽  
Slow Release Urea

Effect of Heavy Metals Cu, Cd, Pb and Zn on Enzyme Activity and Microbial Biomass Carbon in Brown Soil

2014 ◽  
Vol 1073-1076 ◽  
pp. 726-730 ◽  
Author(s):  
Lei Yu ◽  
Jie Min Cheng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Enzyme Activity ◽  
Microbial Biomass ◽  
Catalase Activity ◽  
Urease Activity ◽  
Microbial Biomass Carbon ◽  
Biomass Carbon ◽  
Brown Soil ◽  
Soil Urease

To get more sensitive index for making scientific and objective judgment on heavy metal pollution in brown soil, the influence which heavy metals Cu, Cd, Pb and Zn exert on soil urease, catalase activity and microbial biomass carbon content were evaluated by means of laboratory simulation.Experiment results showed that urease activity firstly increased with the addition of Cu, Cd and Pb, then showed decline trends. But for Zn, the activity of urease was obviously decline with the increased Zn concentrations. Catalase activity firstly increased with the addition of Cu then showed decline trend. But for Cd, Pb and Zn, the activity of catalase obviously declined. Microbial biological carbon all showed decline trends with the addition of Cu, Cd, Pb and Zn.

Effects of Slow-Release Urea Combined with Conventional Urea on Rice Output and Growth in Soils of Different Textures

2013 ◽  
Vol 38 (8) ◽  
pp. 1494-1503 ◽  
Author(s):  
Xiao-Cui ZHANG ◽  
Qi-Gen DAI ◽  
Xing-Xing HU ◽  
De-Jian ZHU ◽  
Xiu-Wen DING ◽  
...  
Keyword(s):  
Slow Release ◽  
Slow Release Urea

Effect of slow-release urea microencapsulated in beeswax and its inclusion in ruminant diets

2019 ◽  
Vol 179 ◽  
pp. 56-63 ◽  
Author(s):  
A. de B. Carvalho ◽  
A.L. da Silva ◽  
A.M. de A. Silva ◽  
A.J. Netto ◽  
T.T.B. de Medeiros ◽  
...  
Keyword(s):  
Slow Release ◽  
Ruminant Diets ◽  
Slow Release Urea

scholarly journals Ruminal fermentation and digestion of cattle diets with total and partial replacement of soybean meal by a slow-release urea product

2019 ◽  
Vol 64 (No. 7) ◽  
pp. 294-301
Author(s):  
S Gonzalez-Munoz ◽  
J Sanchez ◽  
S Lopez-Aguirre ◽  
J Vicente ◽  
J Pinos-Rodriguez
Keyword(s):  
Soybean Meal ◽  
Degradation Rate ◽  
Slow Release ◽  
In Vitro Assay ◽  
Partial Replacement ◽  
Vitro Assay ◽  
Dietary Substitution ◽  
Slow Release Urea

One in vitro assay and one in vivo trial with ruminally cannulated Holstein steers were conducted to evaluate the effects of a dietary substitution of soybean meal by a urea and slow-release urea source of fermentation and degradation of diets for cattle. The experimental diets consisted of the total mixed rations defined as the control with soybean meal (SBM), U (urea), SRU (slow-release urea), and SRU+U+AA (0.42% + 0.42% + 1% amino acids methionine and lysine). The dietary substitution of SBM by U or SRU reduced (P < 0.05) the total gas production (V), microbial mass and degradation at 72 h incubation under the in vitro conditions, as well as the degradation rate (c) and the total volatile fatty acids (VFA) in the rumen of the steers; however, when the dietary substitution of SBM was by U+SRU+AA, those values did not decrease. In the steers, the dietary substitution of SBM by U and SRU reduced the ruminal degradation rate and the total VFA, and increased the ammonia N, but when SBM was substituted by U+SRU+AA in the diets, these changes were not observed. No advantage of SRU over U was found. The dietary substitution of SBM by U, SRU, U+SRU+AA did not modify the molar proportion of the VFA in the rumen nor were there changes in the nutrient digestion or excretion. Both the in vitro assay and the in vivo trial indicated that replacing SBM with U or SRU increases the ruminal ammonia N concentrations and reduces the degradation rate in the rumen, although those undesirable findings were not found when the SBM was replaced by U+SRU+AA. Therefore, it is feasible to replace the SBM with a combination of urea, slow-release urea, lysine and methionine in the diet for the ruminants.

Effect of slow-release urea on the composition of ruminal bacteria and fungi communities in yak

2018 ◽  
Vol 244 ◽  
pp. 18-27 ◽  
Author(s):  
X.T. Yan ◽  
B.Y. Yan ◽  
Q.M. Ren ◽  
J.J. Dou ◽  
W.W. Wang ◽  
...  
Keyword(s):  
Slow Release ◽  
Ruminal Bacteria ◽  
Bacteria And Fungi ◽  
Slow Release Urea
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