Kinetics of soil enzyme activities under different ecosystems: An index of soil quality

Kujur, Monty; Patel, Amiya Kumar

doi:10.4067/s0718-58392014000100015

Cited by 36 publications

(16 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The variances in kinetic parameters of urease occur as a result of an increase in V max , K M , and V max /K M due to variations in physicochemical properties of the soil (Dick et al, 1994), agricultural practices such as fertilizer and pesticide use (Gianfreda et al, 1994), and synthesis of urease enzyme by increasing microbial population. Urease activity showed a positive correlation with N availability, which indicated that this enzyme can be used to make some inferences about the nitrification process in soil and determine if N losses are due to volatilization, nitrification, or denitrification (Kujur and Kumar Patel, 2014). Urease has been widely used for soil quality assessment, since its activity increases with organic fertilization and decreases with synthetic pesticide application on soil (Gianfreda et al, 1994).…”

Section: Resultsmentioning

confidence: 99%

Assessing the impact of azadirachtin application to soil on ureaseactivity and its kinetic parameters

Kizilkaya

Samofalova²,

Mudrykh³

et al. 2015

Turk J Agric For

View full text Add to dashboard Cite

An ideal pesticide should be toxic only to the target organism and biodegradable, and its residue should not affect nontarget surfaces (Chowdhury et al., 2008). One such ideal alternative is the use of natural plant products that have pesticidal activity, such as azadirachtin (Akça et al., 2005). Azadirachtin possesses insecticidal activity against many economically important insect pests such as Helicoverpa armigera, Spodoptera litura, Plutella xylostella, Sitophilus oryzae, Sitophilus zeamis, Earis vitella, Aphis gossypii, Bemicia tabaci, and Pectiniphora gossypiella, and nematodes like Cosmopilitis sordidus. The belief that such natural insecticides are safe or less damaging to the ecosystem also needs to be further validated, as their effect on nontarget organisms is reportedly very close to threshold chronic toxicity (Schmutterer and Singh, 2002;Gopal et al., 2007).

show abstract

Section: Resultsmentioning

confidence: 99%

Assessing the impact of azadirachtin application to soil on ureaseactivity and its kinetic parameters

Kizilkaya

Samofalova²,

Mudrykh³

et al. 2015

Turk J Agric For

View full text Add to dashboard Cite

show abstract

“…Soil enzymes, mainly produced by microorganisms, respond to the changes of soil environment rapidly (Kandeler et al, 1999) and are widely used as an indicator of specific biochemical reactions in soil (Kujur and Patel, 2014;Dick et al, 1994). Phenol oxidase, peroxidase and cellulase are indicators of complex compound metabolism.…”

Section: Roles Of Microbes Soil Enzyme and Soil Substratementioning

confidence: 99%

Responses of peat carbon at different depths to simulated warming and oxidizing

Liu

Chen

Zhu

et al. 2016

Science of The Total Environment

View full text Add to dashboard Cite

“…3c). Soil urease is an important regulator of the transformation of organic nitrogen to inorganic nitrogen [24][25][26] . Therefore, increases in urease activity would improve the mineralization of organic nitrogen, and consequently increase the content of soil inorganic nitrogen.…”

Section: Discussionmentioning

confidence: 99%

Effects of applying ramie fiber nonwoven films on root-zone soil nutrient and bacterial community of rice seedlings for mechanical transplanting

Zhou

Chen

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Raising rice seedlings in flat trays has become the main method for mechanized transplanting of rice in China. However, seedling blocks raised by this method were easily cracked in practice, and this problem can be solved by padding a thin ramie fiber nonwoven film on the bottom surface of seedling tray. This study was conducted to determine the effects of this film on root-zone environment of rice seedlings. The results showed that on the 10 th day after sowing, the soil inorganic nitrogen, especially nitrate nitrogen, content in the root-zone of the film treatment were considerably higher than in the no-film treatment, in contrast, the soil organic matter content was lower in the film treatment, and by the 20 th day, the gap between treatments was enlarged. After applying the film, the Chao 1 index and Shannon index values for the soil bacterial community diversity decreased, and the rice seedlings were shorter, had higher root/shoot ratios, lower nitrate contents, and higher soluble sugar contents. We conclude that application of the ramie fiber nonwoven film resulted in substantial changes in the soil nutrient and bacterial community in root-zone in a short time, which significantly impacted the growth and development of rice seedlings.Rice is a major staple food for about 50% of the world's population 1 . Rice fields account for more than 12% of global cropland area 2 . China is one of the major rice-producing countries in the world with a rice cultivation area of about 30 million hectares, accounting for approximately 18.6% of the world's rice field area 3 . With an increasingly scarce rural labor force, raising rice seedlings in flat trays followed by mechanical transplantation has become a prevalent cultivation method to replace hand transplanting in Chinese rice production 4 . However, this method has a serious defect in practice, as the root system of the seedlings was often not sufficiently intertwined by the optimum transplanting date (20-25 days after sowing). Insufficient rooting in the seedling block means the rice seedling blocks easily crack (Fig. 1c), so the efficiency of mechanical transplanting was seriously decreased 5 .In recent years, An innovative ramie fiber nonwoven film (Fig. 1a) was developed to solve this problem 6 . This film was made of waste fiber from the ramie spinning industry and modified starch, and was constructed using a dry-laid, nonwoven process. Unlike the traditional agricultural nonwoven films that are usually used as mulching materials to cover soil, this film was used to pad the bottom surface of a seedling tray, and was covered by soil (Fig. 1b). The film was quite thin (only about 0.15-0.25 mm); however, previous research 7,8 showed that the efficiency of machine transplanting was significantly improved by using this film, as it promoted the growth of rice seedling roots and helped to form a strong, not easily broken seedling block (Fig. 1d). Moreover, it can significantly improve rice seedling quality, speed up the emergence of new tillers after transplanting, and ...

show abstract

Kinetics of soil enzyme activities under different ecosystems: An index of soil quality

Cited by 36 publications

References 39 publications

Assessing the impact of azadirachtin application to soil on ureaseactivity and its kinetic parameters

Assessing the impact of azadirachtin application to soil on ureaseactivity and its kinetic parameters

Responses of peat carbon at different depths to simulated warming and oxidizing

Effects of applying ramie fiber nonwoven films on root-zone soil nutrient and bacterial community of rice seedlings for mechanical transplanting

Contact Info

Product

Resources

About