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Pakistan Journal of Biological Sciences
  Year: 2002 | Volume: 5 | Issue: 12 | Page No.: 1321-1329
DOI: 10.3923/pjbs.2002.1321.1329
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Characteristics of Soil in Environment Friendly Rice-wheat Cropping System in Southern Korea

Y.S. Cho

A field experiment was conducted to compare soil microbial populations, microbial-N status and soil physical and chemical characteristics in a no-till, unfertilized, direct-sown, wheat-rice, relay-cropping system (NTWR) and also in a conventional transplanted rice single cropping system (CTR). The wheat-rice system was imposed for 2, 4 and 7 years to identify the time course responses in the soil and crop. Recycling of crop residues in the wheat-rice cropping system generally increased the soil organic matter (OM) contents but reduced the level of available P2O5 compared with the conventional system. Generally the soil was fertile with a high initial organic matter contents. Organic matter was increased by 30% during the 7 years of wheat-rice cropping. Other soil physical features, bulk density and permeability to air and water indicated that soil structure could be improved in response to wheat-rice cropping. Seasonal variability of soil microorganisms suggested that 7-year cropping could improve soil physicochemical characteristics but mineral contents in relation to cation exchange capacity (CEC) would decrease after 4-years cropping. Soil tillage may adversely affect soil microbial dynamics. In conclusion, a no-till, unfertilized, direct-sown, wheat-rice cropping system, is likely to sustain grain yield by improving soil bio-physicochemical factors and is one of the most ecologically stable, economically sound and socially supportive wheat-rice production systems.
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How to cite this article:

Y.S. Cho , 2002. Characteristics of Soil in Environment Friendly Rice-wheat Cropping System in Southern Korea. Pakistan Journal of Biological Sciences, 5: 1321-1329.

DOI: 10.3923/pjbs.2002.1321.1329






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