Effects of crop rotation of pineapples - sugarcane on sugarcane growth and soil microflora 甘蔗轮作制度对甘蔗生长及土壤生态的影响
" economic development in china , 1644 - 1800 , " co - author : ramon h . myers , annual meeting of the association for asian studies , washington , d . c . march 26 - 29 , 1998 十八世纪中国粮食作物分布及轮作制度,与黄翔瑜、谢美娥合著,上海:中国经济史学年会, 1998年9月21 - 22日。
This paper reportsthe biological habits , damage and occurrence regularity of common cutgrass . foreffectively controlling weed infestation in fields , it is necessary to establish somerational farming and rotation systems and ameliorate chemical weed control system day byday 通过对李氏禾的生物学特性、发生规律及危害的阐述,提出只有通过建立科学合理的耕作和轮作制度及日趋完善的化学除草体系,才能有效地控制李氏禾的危害。
Then , in order to pursue effect of soil humidity to the relationship between the turnover of organic matter and the micro flora , the no - tillage and ridge culture simulated experiment is carried out to find out the exactly reasons for the high level of organic matter and assoc 可见,大量的有讥残体的返还是土壤有机质增加的充分条件:影响土壤有机质的积累的表面上是耕作和轮作制度,而实质是有机残体的返还量及其适宜的分解、周转条件。