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40_ Reddish preluvosoils from D_S_ Banu Maracine and their ...

40_ Reddish preluvosoils from D_S_ Banu Maracine and their ...

RESULTS AND DISCUSSION

RESULTS AND DISCUSSION As regard the rainfall, in 2005 there were enough rains for the maize crop. With the control variant that was deeply plowed at 21-25 cm the yield was 4,422 kg/ha (Table 1, Figure 1). By reducing the depth of the plow to 13-17 cm the yield has decreased to 2.6%, of 4,309 kg/ha. In comparison with the control variant there is a 113 kg/ha shortage that is not significant. Tabel 1 Influence of tillage system on the maize crop yield on the reddish preluvosoil (2005) Variant Tillage Yield kg/ha % ± Ctrl. Sign. V 1 Deep plow 21-25 cm 4,422 100 - - V 2 Shallow plow 13-17 cm 4,309 97.4 - 113 - V 3 Disc two times 4,145 93.5 - 277 0 V 4 Direct drill 4,027 91.1 - 395 00 DL 5% =170.9 kg/ha DL 1% =279.1 kg/ha DL 0.1% =438.7 kg/ha 4.500 4.400 4.422 4.309 4.300 4.200 4.100 4.000 3.900 4.145 4.027 3.800 V1 V2 V3 V4 Fig. 1. Influence of tillage system on the maize crop yield in 2005 270

The 2006 year has more favorable during the vegetation period. The maize yield was between 4,098 kg/ha with no tillage and 4,750 kg/ha with deep plow control. With the case of shallow plow the yield was 4,582 kg/ha and with two discing the yield was of 4,363 kg/ha (Table 2, Figure 2). In comparison with the control variant the yield minuses have varied between 3.5% (V 2 ) and 13.7% (V 4 ) while the yield loss have been of 168 kg/ha that is not significant with V 2 , of 387 kg/ha with V 3 which is significant and 652 kg/ha with V 4 which is very significant. Table 2 Influence of tillage system on the maize crop yield on the reddish preluvosoil (2006) Variant V 1 V 2 Tillage Deep plow 21-25 cm Shallow plow 13-17 cm Yield Kg/ha % ± Ctrl. Sign. 4,750 100 - - 4,582 96.5 - 168 - V 3 Disc two times 4,363 91.9 - 387 00 V 4 Direct drill 4,098 86.3 - 652 000 DL 5% =226.1 kg/ha DL 1% =342.4 kg/ha DL 0.1% =550.0 kg/ha 4.800 4.700 4.600 4.500 4.400 4.300 4.200 4.100 4.000 3.900 3.800 3.700 4.750 4.582 4.363 4.098 V1 V2 V3 V4 Fig. 2. Influence of tillage system on the maize crop yield in 2006 271

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