| Central-eastern | Central-northern | Central-western | Total | DF | Chi2 | p values |
---|---|---|---|---|---|---|---|
% | % | % | % | Â | Â | Â | |
Sowing period | Â | Â | Â | Â | Â | Â | Â |
 Early of June | 59.46 | 16.22 | 60 | 46.77 | 8 | 61.18 | 0.000 |
 Middle of June | 0 | 5.41 | 24 | 11.29 | |||
 End of June | 32.43 | 27.03 | 16 | 24.19 | |||
 Early of July | 8.11 | 32.43 | 0 | 12.10 | |||
 Middle of July | 0 | 18.92 | 0 | 5.65 | |||
Harvest period | Â | Â | Â | Â | 6 | 46.29 | 0.0000 |
 End of September | 59.46 | 40.54 | 88 | 65.32 | |||
 Early of October | 16.22 | 21.62 | 12 | 16.13 | |||
 Middle of October | 2.7 | 32.43 | 0 | 10.48 | |||
 End of October | 21.62 | 5.41 | 0 | 8.07 | |||
Soil type | Â | Â | Â | Â | Â | Â | Â |
 Gravelly soil | 8.11 | 0 | 0 | 2.42 | 14 | 66.21 | 0.0000 |
 Loose soil | 10.81 | 0 | 0 | 3.23 | |||
 Sandy soil | 16.22 | 37.84 | 26 | 26.61 | |||
 Sandy-clay soil | 8.11 | 56.76 | 62 | 44.35 | |||
 Clay soil | 16.22 | 2.7 | 6 | 8.06 | |||
 Clay-sandy soil | 40.54 | 2.7 | 4 | 14.52 | |||
 Lateritic soil | 0 | 0 | 2 | 0.81 | |||
Weeding | Â | Â | Â | Â | 3 | 26.92 | 0.0000 |
 Once | 35.14 | 13.51 | 32 | 41.94 | |||
 Twice | 64.86 | 86.49 | 68 | 58.06 | |||
Chemical fertilizer | Â | Â | Â | Â | 3 | 35.14 | 0.0000 |
 Yes | 37.84 | 35.14 | 90 | 41.94 | |||
 No | 62.16 | 64.86 | 10 | 58.06 | |||
Organic fertilizer | Â | Â | Â | Â | 3 | 7.19 | 0.027 |
 Yes | 51.35 | 48.65 | 74 | 40.32 | |||
 No | 48.65 | 51.35 | 26 | 59.68 |