[Effects of ex situ rice straw incorporation on organic matter content and main physical properties of hilly red soil].
Two typical land-use types, i.e., newly cultivated slope land and mellow upland, were selected to investigate the effects of ex situ rice straw incorporation on the organic matter content, field water-holding capacity, bulk density, and porosity of hilly red soil, and to approach the correlations between these parameters. The results showed that ex situ incorporation of rice straw increased soil organic matter content, ameliorated soil physical properties, and improved soil water storage. Comparing with non-fertilization and applying chemical fertilizers, ex situ incorporation of rice straw increased the contents of organic matter (5.8%-28.9%) and > 0.25 mm water-stable aggregates in 0-20 cm soil layer, and increased the field water-holding capacity (6.8%-16.2%) and porosity (4.8%-7.7%) significantly (P < 0.05) while decreased the bulk density (4.5%-7.5%) in 10-15 cm soil layer. The organic matter content in 0-20 cm soil layer was significantly correlated to the bulk density, porosity, and field water-holding capacity in 10-15 cm soil layer (P < 0.01), and the field water-holding capacity in 0-20 cm and 10-15 cm soil layers was significantly correlated to the bulk density and porosity in these two layers (P < 0.05).
Zhu
Han-hua
HH
Key Laboratory of Subtropical Agro-ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China. hhzhu04@mails.gucas.ac.cn
Huang
Dao-you
DY
Liu
Shou-long
SL
Zhu
Qi-hong
QH
D005308:Fertilizers; D009930:Organic Chemicals / Q000032:analysis*; D012275:Oryza / Q000737:chemistry*; D018547:Plant Stems / Q000737:chemistry*; D016062:Porosity; D012987:Soil / Q000032:analysis*; D014867:Water / Q000032:analysis
D005308:Fertilizers; D009930:Organic Chemicals; D012987:Soil; D014867:Water