育苗基质不同施肥量对茄果类蔬菜幼苗生长的影响

运用正交试验设计 ,在以草炭、蛭石、珍珠岩为原料的育苗基层中 ,加入不同浓度的氮、磷、钾肥料 ,对番茄、茄子和甜椒幼苗生长的影响进行了研究。结果表明 ,不同肥料品种与施肥量对茄果类蔬菜幼苗生长的影响具有显著差异 ,特别是增施磷肥可使幼苗株高和干物重增加 ,其相关性达到显著或极显著水平 ,是培育优质壮苗的重要营养元素 ;同时 ,要注意氮、磷、钾肥料配合使用 ,以提高壮苗水平。供试育苗基质的最佳N、P2 O5、K2 O施肥量分别为 :番茄 0 .2kg/m3、0 .4kg/m3、0 .2kg/m3,茄子 0 .8kg/m3、0 .4kg/m3、0 .2kg/m3,甜椒 0 .4kg/m3、0 .4kg/m3、0 .4kg/m3。     

重庆酸性紫色土马铃薯的高产优质与养分平衡

Over a period of two years,field experiments were conducted on four silty loam soils grown with foliar vegetable crops inculding Chinese cabbage(Brassica pekingensis Rupr.,cv.Lu-Bai 3),autumn greens (B.chinensis L.,cv.Piao-Geng-Bai),winter greens(B.var.rosularis Tsen et Lee,cv,You-Dong-Er),and summer greens(B.chinensis L.,cv.Zao-Shu5),respectively,Each eperimpent included one CK treatment without K,N and Pfertilizers applied,and four treatments with from low to high doses,0-300 kg hm^-2 for Chinese cabbage,0-150 kg hm^-2 for autumm and winter greens and 0-180 kg hm^-2 for summer greens,of K fertilizers in the form of sulfate of potash(SOP)applied together with N and P fertlizers,One treatment of K fertilizer in the form of muriate of potash(MOP) applied at high levels(150 or 180 g hm^-2)together with N and P fertilizers was included in the experiments of autumn,winter and summer greens ,respectively,in order to compare the effcts of SOP and MOP ,The market yields of the tested crops incresaed significantly with the increasing rate of K application.The crops supplied with K fertilizers yielded more stably as the CV% of their yields decreased with the rate of K application.K fertilization increased not only K contents but also the amounts of N ,P and K absorbed in shoots of autumn,winter and summer greens,which were atatistically significantly correalted to their yields.In can aslo be found that potassium improved the quality of the foliar vegetable crops as their dry mater contents were generally increased and Vc contents obviously increased and nitrate contents markedly decreased ,As compared to MOP,SOP was more effective on the yields and quality of autumn,winter and summer greens at the high levels of fertilization.     

南通市蔬菜农药残留超标现状及应对措施

通过近3年对南通市不同时间、不同品种以及不同抽样地点蔬菜产品农药残留超标状况的比较和原因分析,提出了普及食品安全知识、坚持市场准入制度、推广“产地准出”、推进“三品”认证并加强质量监管的对策。     

硝化抑制剂对海南岛几种野生蔬菜干物质积累的影响

本文探讨了含有硝化抑制剂DMPP的长效肥料ENTEC对三种野生蔬菜(苋菜、闭鞘姜、仙人掌)干物质积累的影响。结果表明：①ENTEC对闭鞘姜干物质积累有显著影响。仙人掌干物质积累较尿素处理提高26％。②三种蔬菜生长过程中均表现为ENTEC处理下的最高生长速率到达时期推迟，干物质积累主要时期延长。     

钼对降低蔬菜硝酸盐积累的效应研究

采用小区试验方法，研究了不同肥料添加钼肥降低蔬菜硝酸盐积累的作用。结果表明，添加钼肥能够明显降低蔬菜硝酸盐积累，施肥后两周采收的蔬菜，硝酸盐含量更低。     

多媒体蔬菜栽培专家系统MVPES

通过对园艺专家的蔬菜栽培知识的研究，研制了多媒体蔬菜栽培专家系统MVPES。MVPES将蔬菜生产分为播前准备、育苗、定植、田间管理、病虫害防治，采收与贮藏及肥料运筹七个子系统。采用描述型知识，数据型知识、规则型知识等知识表示形式，配以土壤信息系统（GIS）、超文本数据库、图片数据库、知识规则库等专家决策支持系统。采用“产生式”、“决策树”和“加权模型逻辑”的方法构建了品种决策，播期决策、定植密度决策、肥料决策和病虫害诊断等决策模块，以Authorware为开发工具设计了MVPES的多媒体流程图，程序采用构件化技术设计。     

辽宁蔬菜水果硝酸盐含量及其安全性问题探讨

本文通过对辽宁省主要蔬菜和水果硝酸盐含量的测定,参比国内外硝酸盐含量分级评价标准,分析了目前全省蔬菜和水果食用的安全状况,提出了降低蔬菜水果产品中硝酸盐含量的有效途径。     

影响蔬菜体内硝酸盐累积的因素及调控研究

本文综述了影响蔬菜硝酸盐累积的因素，并提出了硝酸盐累积的调控措施以及一些新的建议。     

安塞县水土保持型生态农业建设探索

简述了水土保持型生态农业的概念和其建设原则。安塞县水土保持型生态农业应以水土保持为前提，以乡土树种为主，适地适树，适地适林，搞好植被建设；加强梯田、淤地坝建设，扩大杂粮生产，实现粮食自给。同时应加强果园建设与管护，加强畜牧建设，稳定设施蔬菜栽培面积，建立商品性果树、畜牧和设施蔬菜产业。