新型农民理论的国内文献综述

主要针对新型农民的概念界定进行了初步的综述。从有关农民定义的文献综述出发,再分别从人口素质、经济行为两大角度介绍了众多学者对新型农民的理解。在此基础上,笔者提出了自己对新型农民的理解,以起到抛砖引玉的作用。     

山东省木材供需系统计量经济模型的建立

在分析山东省木材供需实际情况的基础上,建立了适用于有计划的商品经济体制的计量经济联立方程模型,为研究木材供需系统提供了新的方法.     

Embryos - the evolutionary boundary of kingdoms of organisms

Bioevolution is still a main puzzle and attracts many scientists to research on it. Here I present that organisms have two important properties, definite structure and self-reproduction. Based on the number and connection of the structural units, organisms can be divided into three groups, unicellular, particellular and polycellular organisms. It can be called polycellular evolution that organisms evolve from unicellular, particellular to polycellular. Also it can be called diploid evolution that organisms evolve from haplobes to diplobes, two groups based on the reproductive differences. Some concepts like spore, zygote and embryos are redefined in the paper. Moreover, I present that embryos are the most important boundary of bioevolution and organisms can be divided into two evolutionary phases, the lower and the higher. The lower organisms, Kingdom Microbia (kingd. nov.), are inembryonate, which include Acytophyla (phyl. nov.), bacteria, protozoa,fungi and inembryonate algae. The higher organisms are embryonate and have two branches, Kingdom Plantae and Kingdom Animalia.Plantae are sessile and, autotrophic or sporogenic, which include higher plants and Nudembryophyta (phyl. nov.). Animalia are heterotrophic and, motile or gametogenic, which include all multicellular animals. The new system, which reflects the two important phases of bioevolution and two branches of higher organisms, can really correct the problem of different kingdoms in different researches or by different researchers.     

丝瓜怎样留种

丝瓜留种需500-1000m的隔离区，一般生产者选留丝瓜种子，株选效果很好。选留时选择具有本品种性的植株。一般要求节间短、均匀、叶片大小适中，叶柄短、结瓜早，丝瓜条上、下粗细均匀的植株留作种株，在中期人工授精后套袋，防止杂交，采收时间最好在植株自然枯死后采瓜剖种，种子晒干后收藏。     

牛腔前卵泡在体外无血清培养中发育为有腔卵泡

用无血清培养系统研究了牛腔前卵泡的体外培养。直径为100－200μm的牛腔前卵泡在添加L－谷氨酰胺、BSA、睾酮、转铁蛋白和硒的McCoy′s 5a培养液中培养，卵泡保持正常的形态结构并持续生长，培养10d左右形成贸泡腔，成腔率约50％。培养液中添加胰岛素对卵泡直径的增长和卵泡腔的形成有明显的促进作用，但添加FSH对腔前卵泡的生长未表现促进作用。     

冬暖型大棚越冬茬丝瓜栽培技术

丝瓜是深受人们喜食的一种优质蔬菜。近年来,人们利用冬暖型大棚进行高密度反季节栽培,不仅产量大幅度提高,而且效益十分可观667m2产量可达5000公斤以上,667m2收入4～5万元。堪称为高产优质高效栽培的典范。1 品种选择 为适应大棚栽培的环境,对品种要求耐寒耐荫、早熟、丰产且对光不敏感的类型。生产中常用的品种有四川线丝瓜、南京长丝瓜、武汉白玉霜丝瓜、夏棠一号丝瓜等。     

菇菜露地栽培模式的研究

我们于1986～1988年进行了菇、菜露地栽培模式研究试验,初步探讨了丝瓜草菇间作和大白菜平菇轮作两种高产栽培工艺。菇、菜露地栽培,是以蔬菜轮作制为基础,间、套和轮作食用菌的一种新的栽培形式。我们所采用