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宁夏中部干旱风沙区马铃薯滴灌节水栽培技术研究
作者: 赵久顺   杨朝霞   任迎萍   何建龙   来源: 辽宁农业科学 年份: 2016 文献类型 : 期刊 关键词: 栽培   节水   干旱区   滴灌   马铃薯  
描述: 在宁夏盐池县对马铃薯1号进行6种不同滴灌节水方式栽培试验,结果表明:在盐池县马铃薯不同滴灌节水处理以处理A5[灌溉定额220 m3/hm2、灌水次数2次(在块茎形成期、块茎增长期进行灌水)]灌溉模式最佳,适宜大面积推广应用。
7种药剂对当归麻口病的防效初报
作者: 陈书珍   来源: 甘肃农业科技 年份: 2016 文献类型 : 期刊 关键词: 浸苗   当归麻口病   壅苗   防治   7种药剂  
描述: 选用7种药剂,采用定植前浸苗和定植时毒沙壅苗的方法进行了当归麻口病防治试验,结果表明,50%多菌灵可湿性粉剂800倍液浸苗后,用40.7%乐本乳油、或3%辛害首颗粒剂、或3%线虫杀净可湿性粉剂、或
黄土高原雨水资源化潜力与时空分布特征
作者: 张宝庆   吴普特   赵西宁   王玉宝   来源: 排灌机械工程学报 年份: 2016 文献类型 : 期刊 关键词: 定量评价   分布式水文模型   雨水利用   可变下渗容量模型   黄土高原  
描述: 可利用雨水资源化潜力总量较为可观;土壤有效水是雨水资源化潜力的主要组成部分;雨水资源化潜力较丰富的黄河河龙区间、泾渭流域和汾河-伊沁河流域,其地表径流占雨水资源化潜力比例相对较高,该区域同时又是黄河
干旱半干旱地区农田灌溉节水治理模式及其绩效研究
作者: 刘涛   来源: 南京农业大学 年份: 2009 文献类型 : 学位论文 关键词: 灌溉   效率   用水者协会   制度建设   自主治理  
描述: the world's resource is 6%, but the average water resource to the world's average level is just 1
全文:了不同农作物的水资源边际产品价值。研究结果表明:在保持其他投入不变的情况下,每增加1m3水资源的投入,胡麻、新土豆、油菜、大麦、玉米的边际产品价值为正,其中胡麻的水资源边际产品价值最高;小麦和大蒜的边际
雍正朝西路军需补给研究
作者: 张连银   来源: 厦门大学 年份: 2007 文献类型 : 学位论文 关键词: 西路   雍正朝   军需  
描述: 论文以清代西路军需作为研究对象,以粮食和牲畜为重点,运用历史学的实证法,兼以数据统计,考察雍正朝西路军需补给及河西驻军的军需补给。 全文由绪论、正文和结语三大部分组成,正文又包括六章。 绪论:界定研究对象“西路”、“军需”等概念,介绍了选题缘由及意义;回顾学术史;陈述运用的资料及研究方法。 第一章:
全文:区域分布; 第四章:从明清驿递的功能变化入手,以具体军需运输为例,纠正以往对台站功能的错误认识,并对军需运输的工具、运输组织、分段运输及运输中的脚价问题进行探讨。 第五章:河西驻军与噶路的军需
陕西省农业现代化对农民增收的关系研究
作者: 雷婷   来源: 西北农林科技大学 年份: 2010 文献类型 : 学位论文 关键词: 陕西省   农民增收   农业现代化  
描述: e’ stability.This paper sets Shaanxi province as an example,hope to find the main factors affecting the income of peasants and their contribution in the system of the agricultural modernization, so as to identify the means of raising income of farmers from the view of the agricultural technology.
全文:农业现代化的发展水平。之后建立一个理论框架假定陕西农业现代化(以生产条件、投入水平、产出水平、科技水平为代表)对农民收入存在正的影响作用,再用这四类因子和农民收入的30年平减数据建立科布·道格拉生产函数
蚕丝文化符号对中华农耕社会集体意识的表达
作者: 蔡璐   来源: 西南大学 年份: 2012 文献类型 : 学位论文 关键词: 集体意识   蚕丝文化符号   农耕社会  
描述: 蚕丝文化是基于养蚕缫丝纺织生产活动,以物质和非物质遗存为表现形式,所形成的价值观、情感和社会行为方式的总和。华夏文明孕育了蚕丝文化,养蚕、栽桑、缫丝、纺织成为中华农耕社会中重要的经济活动。随着社会的发展,蚕丝文化这个抽象概念被具体化,其中甲骨文、神话传说、先蚕礼、陶蚕蛹、玉蚕、蚕形刻划、蚕织图、十二
全文:农耕社会集体意识与蚕丝文化符号之间的深层结构。 本论文研究重要理论基础主要有两方面:一是杜尔姆提出的集体意识的理论,二是结构主义学派对于文化与符号关系结构阐释的理论。本文重要立论依据是文化意义透过作为
唐代西北地区政治地理格局变动研究
作者: 魏昀   来源: 陕西师范大学 年份: 2009 文献类型 : 学位论文 关键词: 唐朝   疆域   羁縻府州   屯田   交通  
描述: th about three of culture and materials the country's territory changed a lot. The country's territory was in an extending period before and the An-Shi Armed Rebellion, and once extended to the Central Asia area.At the same time, the Tang government founded the Ji-Mi-Fu-Zhou system in the Western Regions. The situation changed rapidly when the An-Shi Armed Rebellion broke out. Then the central government mobilized the troops in the Western Regions to participating in putting down the Rebellion, so the border defence was weakened. Tu-bo took the chance to occupy a large amount of territory. Almost Long You Area was oppupied by Tu-bo later in Tang Dynasty. The thesis is divided into five chapters: political geography circumstance in northwest area in early Tang Dynasty,including the situation of physical geography and the nation regime; the political geography situation in the extending period of territory from Tai Zong to Gao Zong;the political geography situation in the stable period of territory from Wu-zhou era to An-Shi Armed Rebellion;the political geography situation in the shrinking period of territory after An-Shi Armed Rebellion;relationship between the change of political geography situation and economy and traffic. Conclusion: From A.D. 7th to 9th century,Asia-Erope Continent was a place where Tang, Da-shi and Tu-bo contended for political space. The country's power of politics, economy and military strengthened before An-Shi Armed Rebellion, and part of the Central Asia area belonged to Tang government. The territory reached to an unparalleled scale at that time, which can be divided into three parts: the capital area where Chang-an and Luoyang were located in was the empire's center of politics, culture and military; the Zheng-zhou that around the captals was where the finance of central government stemmed from; the Ji-mi-fu-zhou system Tang government founded in the frontier area was the military buffer zone with nation regimes in vicnity. At the same time, Tu-bo appeared in the stage of history in A.D 7th century. After the King Song-zan-gan-bu unified the Tibet plateau, Tu-bo's power strengthed rapidly and harassed Tang's frontiers inceasingly. The Tang government put the defense police actively into effect so as to resist Tu-bo's aggression and defend country's benefit in Long-you area. When An-Shi Armed Rebellion broke out, Tu-bo took the chance to occupy vast territory of Tang Dynasty, like Minzhou, Lanzhou, Kuozhou, Guazhou, and so on. Eventually, almost all Long-you areas belonging to Tang Dynasty was occupid by Tu-bo. In the field of geopolitics, the national power strengthened in the earlier stage of Tang Dynasty and stronger than Tu-bo. Tu-bo didn't have the strength contending with Tang Dynasty, even harassed the frontier once a while. Until the An-Shi Armed Rebellion, the Tang government had no more advantage and the national power was weakened.
全文:时期,国力处于上升阶段,开元时达到鼎盛,较之大食和吐蕃的实力,唐朝占有明显的优势,吐蕃虽然偶尔有侵扰唐朝边地的举动,但并不具备与之抗衡的实力。直到公元751年怛逻战役,崛起的大食与唐帝国发生了正面
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