Lu Y.-H.,Hunan Agricultural University |
Lu Y.-H.,Hunan Institute of Soil and Fertilizer |
Yang Z.-P.,Hunan Agricultural University |
Yang Z.-P.,Hunan Institute of Soil and Fertilizer |
And 7 more authors.
Chinese Journal of Applied Ecology | Year: 2010
In 2005 and 2007, soil samples were collected from a 27-year experimental field in Wangcheng County of Hunan Province to study the effects of long-term application of chemical fertilizers (CF) and their combinations with pig manure (PM) and rice straw (RS) on the chemical and biochemical properties of reddish paddy soil (Typic Haplic-Stagnic Anthrosis). Under the fertilization, soil pH had somewhat decrease, and soil conductivity changed less, compared with those before the experiment was installed. The contents of soil total organic carbon (TOC), total N, available N and P, and microbial biomass C (C mic) and N (N mic) , soil respiration rate, and activities of soil urease, acid phosphatase, invertase, and dehydrogenase were all higher in treatments CF +PM and CF+RS than in treatments CF and CK, and the C mic/TOC ratio was higher in treatments CF+PM and CF+RS than in treatment CF. During the study period, applying CF alone induced a lower rice yield than the application of CF plus PM or RS. There were significant positive correlations (P<0. 01) between soil biochemical properties and soil TOC and nutrient contents. It was concluded that long-term application of CF combined with PM and RS improved the soil chemical and biochemical properties, being an effective measure to improve the quality and fertility of reddish paddy soil.
Xie Y.-H.,Hunan Institute of Soil and Fertilizer |
Xie Y.-H.,Central South University |
Xie Y.-H.,Ministry of Agriculture Key Laboratory of Agri Environment in the Midstream of Yangtze River Plain |
Ji X.-H.,Hunan Institute of Soil and Fertilizer |
And 12 more authors.
Chinese Journal of Applied Ecology | Year: 2015
The active effect of soil Cd and Zn and their interaction was studied in typical paddy field in south China by monitoring the contents of Cd and Zn in soil and rice in rice fields applied with pig manure, chicken manure or rice straw for 4 years continuously. The results showed that applying pig manure, chicken manure or rice straw had no significant impact on the soil total Cd content, soil available Cd content and soil Cd activity, but tended to increase the soil total Cd content and increased the soil total Zn content, soil available Zn content and Zn activity significantly. Applications of pig manure, chicken manure and rice straw all reduced the Cd content of brown rice, in order of pig manure > chicken manure > rice straw. The Cd contents of brown rice, stem and leaf in the treatment applied with pig manure were lower than in the control by 37.5%, 44.0% and 36.4%, respectively; the Cd contents of brown rice, stem and leaf in the treatment applied with chicken manure were lower than in the control by 22.5%, 33.8%, and 22.7%, respectively; the Cd content of brown rice in the treatment applied with rice straw was lower than in the control by 7.5% but its contents in stem and leaf increased by 8.2% and 22.7%, respectively. The reduction in the brown rice Cd content was mainly due to the reduction of Cd enrichment from soil to brown rice after application of pig or chicken manure, but mainly due to the reduction of Cd transportation from stem to brown rice after straw application. Applications of pig manure, chicken manure and rice straw increased Zn contents in rice stem by 53.4%, 53.4% and 13.9%, respectively, but all had no significant effect on brown rice and leaf's Zn contents. Zn and Cd had the significant antagonistic effects in the soil and rice stem. The increase of Zn content in soil and rice stem inhibited the adsorption and accumulation of Cd in the brown rice, stem and leaf significantly, and with the increase of the proportion of Zn/Cd, the competitive absorption between Cd and Zn by rice was the main control factor affecting the Cd absorption by rice than their competitive adsorption by soil. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved.
Nie J.,Hunan Institute of Soil and Fertilizer |
Zheng S.-X.,Hunan Institute of Soil and Fertilizer |
Liao Y.-L.,Hunan Institute of Soil and Fertilizer |
Xie J.,Hunan Institute of Soil and Fertilizer |
And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2010
A total of 24 paddy soil samples with different productivity were collected from eight main rice production counties in east, central, and northwest Hunan Province, with the parameters of soil physical properties and clay mineral composition, including bulk density, particle density, porosity, field water-holding capacity, water-stable aggregates, mean weight diameter, normalized mean weight diameter, aggregate destruction rate, organic carbon, organic'cementing materials, inorganic cementing materials, and clay minerals determined. The results showed that highly productive (> 14000 kg · hm -2) paddy soil possessed bulk density below 1.2 g · cm 3, soil particle density about 2.0 g · cm 3, and 5-0.5 mm water-stable macroaggregates about 20%. Most of the test parameters had no significant differences between highly productive and medium productive (10000-13500 kg · hm -2) paddy soils, but significant differences between highly productive and lowly productive (<10000 kg · hm -2) paddy soils, suggesting that under good management, medium productive paddy soils could be upgraded to highly productive paddy soils. At present, the physical properties of lowly productive paddy soils were poor, which need to be improved to raise productivity.