《Table 4 Effects (P values) of stubble retention and tillage on the number of species and seed densi

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《Suppression of weeds and weed seeds in the soil by stubbles and no-tillage in an arid maize-winter wheat-common vetch rotation on the Loess Plateau of China》

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Note:The P values were generated using the Holm-Sidak test in a two-way ANOVA.

Except that tillage affected the number of weed species in the weed seedbank during the spring growth of winter wheat，there was no effect of stubble retention or tillage on the species number in other cases（Table 4）.The total number of weed species in the weed seedbank was higher during the spring growth of winter wheat in the NT and NTS treatments than in the T treatment，while there was no significant difference among the NT，TS and NTS treatments，and between the TS and T treatments（Fig.4）.Also，there was no significant difference in the number of weed species in the weed seedbank among treatments during post-vetch fallow.