【摘 要】
：
榕江县是贵州省主要西瓜产区,常年种植面积1.5万亩,年产量2.4万吨。但由于年年连作,枯萎病(蔓割病)严重发生,西瓜单位面积产量及品质有所下降。为解决在连作田上受枯萎病危
论文部分内容阅读
榕江县是贵州省主要西瓜产区,常年种植面积1.5万亩,年产量2.4万吨。但由于年年连作,枯萎病(蔓割病)严重发生,西瓜单位面积产量及品质有所下降。为解决在连作田上受枯萎病危害问题,从1983年开始进行西瓜嫁接
Rongjiang County, Guizhou Province, is the main watermelon producing areas, perennial planting area of 15000 mu, annual output of 24000 tons. However, due to successive years, Fusarium wilt (spore-borne disease) occurred seriously, watermelon yield per unit area and quality declined. In order to solve the problem of continuous cropping up with wilt disease, watermelon grafting began in 1983
其他文献
Before the technologies of the renewable energy on solar,biomass supported systems are efficiently put into practice,coal is the only reliable energy resour
过去,剪除的树枝条一般是放置不管或予以燃烧,存在着发生病虫及烟雾公害等问题。日本引进应用处理剪枝的自动粹碎机,用来处理果园修剪掉的枝条,使之还原到土壤内,有效地防止
Fluidization is the solid gas(or liquid)two phase flow phenomena.Its research was initiated by metallurgy especially by chemical engineering.The major appli
In this investigation,small angle X-ray scattering(SAXS)emissions were used to obtain radii of gyration,scattering coefficients and surface to volume ratios
“我们好像是一个陌生人处于一个陌生的世界。”在地铁深入地下的封闭空间内,隐现着一个城市的精神状态以及城市对于个体的态度。对于很多人来说,地铁是连结疲惫与更疲惫的一
期货交易理论与实务第八讲期货保值主讲刘迎秋８．１什么是套期保值？套期保值又称套头交易、对冲交易，是一种旨在把价格波动可能造成的经营风险减小到最低限度的期货买卖方式。其基本
Large amount of natural gas was contained in natural gas hydrates reservoirs in permafrost and marine sediments.It can be a big energy resource,and represen
1843年(道光二十三年),伦敦一家出版公司出版了《中国:那个古代帝图的风景、建筑和社会习俗》一书,画家托马斯·阿罗姆为其绘制了极富想象力的精彩插图,他大量收集前人访华的
As a continuation of previous work of our group by Cheng and co-workers inventing a simple solvothermal method to fabricate metal organic framework NH2-MIL-
随着商品经济的发展,商品交换的范围不断扩大,商品交换的方式已经不单纯是生产者与消费者的交换关系,二者之间更多地借助中介入。保险作为一种特殊的商品,在广泛地、复杂地