Protected vegetable production made the traditional agriculture gradually get rid of the shackles of nature, broke the seasonal traditional agriculture and realized the anti season list of agricultural products. While...Protected vegetable production made the traditional agriculture gradually get rid of the shackles of nature, broke the seasonal traditional agriculture and realized the anti season list of agricultural products. While protected vegetables often encountered sudden disasters in production and were restricted with the conditions of low temperature and weak light. Aimed at the sudden disasters of protected vegetable production in Hebei Province,the countermeasures for disaster prevention and control were put forward from the aspects of variety selection, seedling treatment technology,grafting technique,cultivation and management,flower and fruit retention technology,application of exogenous substance,rational fertilization,transgenic technology and so on,in order to reduce production risks and cut loss,realize that protected vegetable production is safe,good-quality and efficient.展开更多
为结合分析一维河模型和二维洪泛区模型,利用Info Works RS对蒋巷联圩防洪保护区洪水演进过程进行二维模拟,分别选取2010年和1998年外洲水文站实测资料对一维河道模型进行了率定和验证,结果较为合理;选取赣江50 a一遇设计洪水同时鄱阳...为结合分析一维河模型和二维洪泛区模型,利用Info Works RS对蒋巷联圩防洪保护区洪水演进过程进行二维模拟,分别选取2010年和1998年外洲水文站实测资料对一维河道模型进行了率定和验证,结果较为合理;选取赣江50 a一遇设计洪水同时鄱阳湖遭遇湖口22. 5 m(吴淞高程)恒定洪水位的边界条件,分析了最不利工况下区内的溃口溃决过程、洪水演进过程及淹没水深等要素,计算结果较好地反映了区内溃堤后的洪水演进情况。研究成果可为江西省防洪减灾提供决策支持。展开更多
文摘Protected vegetable production made the traditional agriculture gradually get rid of the shackles of nature, broke the seasonal traditional agriculture and realized the anti season list of agricultural products. While protected vegetables often encountered sudden disasters in production and were restricted with the conditions of low temperature and weak light. Aimed at the sudden disasters of protected vegetable production in Hebei Province,the countermeasures for disaster prevention and control were put forward from the aspects of variety selection, seedling treatment technology,grafting technique,cultivation and management,flower and fruit retention technology,application of exogenous substance,rational fertilization,transgenic technology and so on,in order to reduce production risks and cut loss,realize that protected vegetable production is safe,good-quality and efficient.
