ダイズ 2つの問題点をクリアした2つの方法 《深層 …

1 5 3 5% 2 t 500 t 15 25 t 3 5% 10a 600kg 200kg/10a 1t 70 90kg 8 8 10a 50 100kg (2kgN/10a ) (LP-100 10kgN/10a) 20cm ( -1) 1990 ( ) 480kg/10a 592kg/10a Tewari 2001 3 ( ) 30cm (10kgN/10a) 20cm 3cm (USDA110 ) 1mL 10 ( PP ) ( PP ) ( )

2 10 3 -1 PP < < PP 75cm 27cm 1 ( :5 /m2) ( 60kg P205 80kgK20) 10cm 20cm (LP-100) 10kgN/10a 10cm -2 PP 30cm 40cm ( -1 ) PP PP PP PP USDA110 USDA110 PP 2 -1 100 - 100 ( / ) ( / ) ( ) ( / ) ( )

3 331b 540b 1135b 467b 696b 1407b 604a 807a 1747a PP 612a 844a 1754a 314b 580b 1059b 422ab 626b 1387b 535a 795a 1694a 541a 758a 1692a 288b 567b 973b 453a 690a 1496a 429a 778a 1337a PP 460a 702a 1494a 30cm ( ) 1 1ha PP PP 3 9 /m2( 75cm x 15cm) 1 -3 PP PP ( -1 ) PP (80g/m2) 2 (200 /m2) 300 /m2 340 420 / ( -1 )

4 PP PP 15N 2002 20cm En1282 15N En1282 15N (650 /m2) (561 /m2) (418 / ) (329 /m2) (231 /m2) 15N -2 1 1m2 (32g N) (25 N) (21 N) (20 N) (43%) (36%) (21%) ( ) -4 2 15% 20% 30% 1 2 3 1 2 10% 2002 (10kgN/10a) 100 LP-100(10kgN/10a) 51% 65% 61% 61% 66% ( )

5 (LP-100) 9 ( ) 1mM 1mM 5mM

6 (10kgN/10a) : 1) 2001 2 181-214( ) 2) 1993 ( ) 68 282-288 3) 2005 11-38 4) 1993 64 338-340 5)Tewari,K., Suganuma,T., Fujikake,H., Ohtake, , Sueyoshi,K., Takahashi,Y., and Ohyama,T. 2002 Effect of deep placement of calcium cyanamide, coated urea, and urea on soybean (Glycine max (L.) Merr.) seed yield in relation to dlfferent inoculation methods, Soil Sci. Plant Nutr., 48, 855-863 6)Tewari, K., 2003 74 183-189 7)Tewari, K.

7 , Suganuma, T., Fujikake, H., Ohtake, N., Sueyoshi, K., Takahashi,Y., and Ohyama,T. 2004 Effect of deep placement of N fertilizers and different inoculation methods of Bradyrhizobia on growth , N2 fixation activity and N absorption rate of field grown soybean plants, and Crop Science, 190,46-58 8)Tewari, K., Onda, M., Ito, S., Yamazaki, A., Fujikake, H., Ohtake, N., Sueyoshi, K., Takahashi, Y., and Ohyama, T. 2004 Effect of placement of urea and coated urea fertilizers on yield and quality of soybean(Glycine max (L.) Merr.) seeds. Soil Sci. Plant Nutr., 50, 1245-1254 9)Tewari, K., Onda, M., Ito, S., Yamazaki, A., Fujikake, H., Ohtake, N., Sueyoshi, K., Takahashi, Y., and Ohyama, T. 2005 15N analysis of the promotive effect of deep placement of slow-release N fertilizers on growth and seed yield of soybean. Soil Sci. Plant Nutr., 51, 885-892 10)Yashima, H., Fujikake, H., Yamazaki, A., Ito, S., Sato, T., Tewari, K.

8 , Ohtake, N., Sueyoshi, K., Takahashi, Y., and Ohyama, T. : Long-term effect of nitrate application from lower part of roots on nodulation and N2 fixation in upper part of roots of soybean (Glycine max (L.) Merr.) in two-layered pot experiment, Soil Nutr., 51,981-990(2005)