Pedosphere 15(1): 84--94, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effects of paper mill sludge on potassium, sodium, calcium, and magnesium concentrations in different soybean cultivars
YAN Xiang-Kui1,2, K. W. CHANG3 and H. L. XU4
1 National Institute for Agro-Environmental Sciences, Tsukuba-shi 305-8506 (Japan). E-mail: yanxk111@yahoo.com.cn
2 Gansu Agricultural University, Lanzhou, 730070 (China)
3 Agrochemistry Department, Chungnam National University, Kung-Dong, Taejon, 305-764 (Korea)
4 International Nature Farming Research Center, 5632 Hata, Nagano 390-1401 (Japan)
ABSTRACT
      A field experiment was conducted on a sandy loam soil at an Experimental Farm in Taejon, South Korea, to determine the effects of paper mill sludge compost application rates on K, Na, Ca and Mg concentrations of soybean (Glycine max (L.) Merr.) aboveground tissues and the genotypic effects on the concentrations of these elements. Sludge compost treatments of 0, 75, and 150 t ha-1 were applied to 30 diverse soybean cultivars. Concentrations of K, Na, Ca, and Mg in aboveground tissues harvested 69 days after planting (DAP) varied with the genotype and the application rate of paper-mill sludge compost, with the sludge compost application rate exerting stronger influence on these concentrations than the genotype. The magnitude of variation caused by both genotype and sludge compost application was in the order of Mg > K > Ca > Na. Significantly positive correlations were observed between K and Na (P < 0.01), Na and Ca (P < 0.05), and Ca and Mg (P < 0.01). Also, the lower the sludge compost application rate, the larger the variation in the concentrations of K, Na, and Ca. From this several cultivars were identified for use as an accumulator for one or more of these elements.
Key Words:  calcium, magnesium, paper mill sludge, potassium, sodium, soybean
Citation: Yan, X. K., Chang, K. W. and Xu, H. L. 2005. Effects of paper mill sludge on potassium, sodium, calcium, and magnesium concentrations in different soybean cultivars. Pedosphere. 15(1): 84-94.
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