The Eleventh Regional Wheat Workshop For Eastern ... - Cimmyt

Impact ofcropping sequence and fertilizer application on soil parameters - Kamwaga et at.
Table 4. Soil N03 (ppm) as affected by rotation and depth of sampling.
Depth· Rotation sequence
(cm) 1 2 . 3 4 5 6 7 8 9 10 11 12 13 14 . 15 16. Mea~:
0-IS 29.1a 26.7a 27.9a 28.7a 29.2a 29.8a 31.0a 36.2a 32.4a 29.3a 27.0a 29.4a 32.8a 30.9a 34.0a 27.7a 30.1A
IS-30 24.6b 21.7b 22.8b 24.0b 27.1b 2S.7b 2S.4b 31.3b 24.6b 24.9b 23.Sb 2S.8b 28.2b 26.1b 29.6b 24.4b 2S.6B
30-60 24.1b 20.Sb 21.8b 22.9b 24.7c 24.1b 26.7b 27.2c 22.8b 24.4b 22.7b 2S.0b 26.9b 26.0b 27.4c 21.4c 24.3C
LSD(O.OS) 2.11 0.S3 I
--- --- -
Within each column, values followed by the same letter are not significantly different at the S% level of the LSD test.
Table 5. Soil P (ppm) as affected by rotation and depth of sampling .
. . "
, .... ,
'.'
DeJ.!th RQtation sequence .
.- ..;.'
, (em) . ~.' : 1 2., ·' .,3 4 ' 5 ' .6 7 8 9 10 11 12 . .13 14 . 15- 16. ',' ;:Mea~:.
0-lS 28.0a 27.3a 28.0a 27.8a 29.0a 31.2a 31.7a 32.~a 30.7a 26.8a 26.9a 2S.7a 28.7a 29.8a 31.0a 28.3a 29.0A
IS-30 21.4b 23 .2b 23.3b 21.3b 19.8b 2S.1b 2S.1b 26.9b 21.8b 20.7b 19.3b 21.3b 20.9b 21.1b 22.6b 21.8b 22.2B
30-60 20.4b 21.3b 21.3b 21.3b 16.6b 20.7c 23.3b 19.1c 17.7c 18.0b 18.8b 21.Sb 18.Sb 16.0c 21.8b 20.3b 19.8C I
LSD(O.OS) 3.43 0.8s91
---- - -
Within each column, values followed by the same letter are not significantly different at the S% level of the LSD test.
Table 6. Soil pH as affected by rotation and depth of sampling.
~Depth Rotation sequence . !
. (cm) :. . '. 1 ; :'2 3: 4 5 6 7 8 9 lO ' 11 ' 12: 13 . 14 . 15 16 .
. . : .... ;Meai{1
0-lS 6.06c 6.11c 6.17c 6.18b 6.18b 6.26c 6.29c 6.26b 6.23c 6.18b 6.08c 6.19b 6.07c 6.24a 6.08b 6.19b 6.17C
lS-30 6.13b 6.24b 6.30b 6.23ab 6.13b 6.38b 6.38b 6.28b 6.32b 6.24b 6.18b 6.29a 6.19b 6.2Sa 6.12b 6.2Sb 6.2SB
30-60 6.29a 6.34a 6.40a 6.27a 6.28a 6.49a 6.47a 6.36a 6.4Sa 6.33a 6.30a 6.36a 6.31a 6.29a 6.2Sa 6.34a 6.3SA
LSD(O.OS) 0.072 0.0181
--
Within each column, values followed by the same letter are not significantly different at the S% level of the LSD test.
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