Effect of mixing sludge dredged from farm ponds with weathered granite soil on germination and growth of plant
2009
Takisawa, T., Okayama Univ. (Japan) | Murakami, A. | Nishimura, S. | Murakami, K.
This paper presents the experimental study on the agricultural use of sludge dredged from farm pond and its effects on plant growth. Komatsuna was used as the test plant and two types of soils, containing 10 and 30% of the dredged sludge mixing in decomposed granite, were prepared. The test results have revealed the relationship between the physicochemical characteristics of the sludge and the plant growth. The following findings have been clarified: 1) The soil with 10% of the sludge was suitable for the plant growth because the water retention adaptability was improved; 2) When the soil contained the excessive amount of the sludge, the plant growth was prevented due to the decreased drainage in the soil; 3) The soil containing dehydrated sludge grew the plant better than the soil containing the sludge without any treatment because of coagulant; 4) Inorganic component of dredged sludge had little influence on plant growth. Using composite soil with 10% of the sludge by soil dressing was beneficial, since it is important from the resources recycling point of view.
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