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Tan et al. (2004) indicated that paddy soil fertility and some enzyme activities could be improved by an optimal cropping system and by organic manure. This study of crop rotation, fertilizer use, and enzyme activity tested different parameters than assessed in the present study. ÉÏÃæÊÇÍêÕûµÄÒâ˼ This study of crop rotation, fertilizer use, and enzyme activity tested different parameters than assessed in the present study. Õâ¾äÎÒÔõô¾õµÃ·Òë²»¶ÔÍ·°¡,ËüµÄÒâ˼ÊÇ˵Tan et al. (2004)µÄÑо¿ÖÐ,×÷ÎïÂÖ×÷,ʹÓõķÊÁϺͲⶨµÄø»îÐÔÓëÏÖÔÚµÄÑо¿Ëù²â¶¨µÄÄÚÈݲ»Í¬. |
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