Abstract
ABSTRACT: The influences of byproduct amendments, containing silicon, calcium, magnesium and potassium, on acidic soil quality in Jiaodong Peninsula of China had been studied and compared with that of lime through monitoring physicochemical properties and enzyme activities of acidic soil over a 120-day period. Byproduct amendments (1125, 2250, 4500 and 9000 kg ha-1) and lime 2250 kg ha-1 was applied in the acidic soil. Results showed that both byproduct amendments and lime significantly increased the pH, EC and enzyme activities of soil. The by-product amendments inhibited microbial biomass carbon and soil respiration. Nevertheless, the lime-treated soil had a much more higher level of CO2 emission than the by-product amendments-treated soil. Compared to the by-product amendments-treated soil, the lime-treated soil had the higher pH, peroxidase activity, phenol oxidase activity and invertase activity. Therefore, lime might be a better choice over by-product amendments to improve chemical and biological properties of the acidic soil in Jiaodong Peninsula of China. For soils lacking available calcium and magnesium, the mixture of 4500 kg ha-1 amendments and 2250 kg ha-1 lime was recommend to treat the soil.
Highlights
Soil acidity could reduce crop yield, pollute water and degrade forest, and further impede global sustainable development (CREGAN & SCOTT, 1998)
After the fresh incubated soil sample was mixed with water at 1:2.5 ratio (w/v, soil to water) and shaken for an hour, its pH and EC were determined on a pH meter (METTLER TOLEDO S210-K pH meter, USA) and an electronic conductivity meter (DDSJ308A, Shanghai Leici, China), respectively
The pH of the soil solution is very important to determine the chemical environment of plants (BOLAN et al, 2003) because any component of the soil or of its biological inhabitants is very sensitive to soil pH
Summary
Soil acidity could reduce crop yield, pollute water and degrade forest, and further impede global sustainable development (CREGAN & SCOTT, 1998). Jiaodong Peninsula in China, which is located in the so-called “fruit belt” of North Latitude 36 of the world, has a long tradition of intensive horticultural crop production. Its soil acidification is severe according to a preliminary investigation in 2007-2009. The topsoil pH in 60.4% of the 268 investigated orchard sites was less than 5.5 (LI et al, 2014). Soil acidification may increase the bioavailability of metals and worsen their contamination, to limit the growth of horticultural crops. It is necessary to improve the acidity soil, including increasing soil pH and ameliorating soil physicochemical properties, of Approved 04.22.19 Returned CR-2018-0098.R3 by the author
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