The root system of malus toringoides is so developed that it can grow on prior soil and in cracks of rock . like malus transitoria , malus toringoides tolerant to draught and can grow on sunny dry slope , rocks of steep cliffs , barren stone area , roadsides and field sides . malus toringoides was also adapted to habitat shade and can grow normally gorges of hill , and even on sides of brook and river , where water often attack on 变叶海棠根系发达，能穿透坚硬的土层和岩石裂缝，它具有喜光耐旱的特点，在阳坡、凸坡、悬崖峭壁、瘠薄坚硬的石谷子地、道路两旁和农耕地边都能正常生长，与花叶海棠近似；变叶海棠也具有喜湿耐阴的特点，在深山峡谷、甚至在根系长期经受洪水侵袭的溪边、河岸也能正常生长，与陇东海棠近似。
The study aimed at , based on competitiveness analysis of each category of agricultural products , that its competitive advantages and disadvantages and the direct and indirect factors which impact competitiveness would be highlighted , that evaluation frame of agricultural products competitiveness would be explored from the theoretical view , and that suggestions would be made on agricultural industry policy making , agricultural production structure adjusting , and agricultural production promoting . by means of modem competitiveness theory and the qualitative and quantitative analysis , competition states in world and domestic markets were studied of shanxi ' s agricultural products which are namely wheat , maize , sorghum , millet , buckwheat , naked barley , dry beans , sunflower , cotton , apple , pear , red date , walnut , potato , vegetables . there are totally 16 categorie s 本研究用现代竞争力理论，定性分析与定量分析的方法对山西省小麦、玉米、高粱、谷子、荞麦、裸燕麦、大豆、杂豆、葵花、棉花、苹果、梨、红枣、核桃、马铃薯、蔬菜16种(类)农产品国内外市场竞争态势、在国内市场竞争力表现、影响竞争力的直接因素和间接因素进行了比较全面、系统的分析，旨在通过对每种(类)的竞争力分析研究，掌握它们的竞争优势和劣势及其影响因素，从理论角度探索农产品竞争力研究框架，从实践角度为山西省制定农业产业政策、调整农业结构、提高农产品竞争力提供依据。
Secondly , many crop water parameters , including eta , wue and water sensitive parameters etc . , were studied through onsite experiment , typical household survey and other methods . by analyzing crop water usage characteristics , we concluded : 1 . about eta : the amout of pear water consumption was highest ( 750 . 2mm ) , however , the watermelon planted in greenhouse consumed only 266 . 5mm ; 2 通过对大田作物需水量与自然降水量的平衡分析，可以将顺义区主要大田作物分为三类： 1 )灌溉需求量较大的作物，包括水稻、冬小麦、苜蓿、棉花； 2 )灌溉需求量较小的作物，包括夏播作物(夏玉米、夏花生、夏大豆)和耐旱、避旱作物(高梁、谷子) ； 3 )中间型作物，包括大部分春播作物(春玉米、春花生、春大豆等) 。
Millet and tobacco were transformed with the thrt ' e plant expression vectors . our observations with transgenic plants showed that the pf40 gene affected the growth of lateral shoots developing in the basipetal pattern early after floral transition . analysisd the transgenic plants showed the pf40 gene can reduced the apical dominance of both millet and tobacco 测量结果表明pf40基因过量表达的转基因谷子生长素的含量降低为对照的0 . 6 0 . 8倍，而细胞分裂素的含量较对照约升高0 . 2 0 . 35倍，生长素与细胞分裂素的比值在转基因植物中改变明显，降低到对照的一半。
In practice , all 16 categories of agricultural products studied were classified into 3 types according to their market tompetitiveness : the first type was the competition - preponderant products including millet , potato , apple , walnut ; the second type was competition - inferior products including wheat , cotton , soybean ; the third type was competition - middle products , including maize , sorghum , buckwheat , naked barley , dry beans , sunflower , pear , red date , vegetables , which were competition - superior in some aspects while competition - inferior in other aspects , of which some varieties are competition - superior while others are competition - inferior 在实践方面，根据市场竞争力强弱可把这些农产品分成三类：第一类为竞争优势产品，包括谷子、马铃薯、苹果、核桃；第二类为竞争劣势产品，包括小麦、棉花、大豆；第三类为中间类产品：包括玉米、高粱、荞麦、裸燕麦、杂豆、葵花、梨、红枣、蔬菜。这些产品在有些方面具有竞争优势，有些方面又处于竞争劣势。有些品种有竞争优势，有些品种竞争劣势。
In the demonstration section of the paper , aiming at the main plantation crops and variety in shanxi and each region in shanxi , some research has been done , including determining and analyzing scale advantage , efficiency advantage and aggregated advantage of the main grain crops ( including wheat , corn , millet , soja , jowar and tubers ) and main cash crops ( including oil - bearing crops , cotton , fiber crops , beetroots , tobacco , medicinal materials , vegetables and melon , fruit ) in shanxi , determining and analyzing scale advantage , efficiency advantage , benefit advantage and aggregated advantage of the main plantation variety ( including wheat , corn , millet , soja , jowar , cotton , beetroots , rapeseed , flue - cured tobacco and apple ) in shanxi , determining and analyzing the advantage in each region in shanxi . the research shows that some crops and variety in shanxi own advantage , they are millet , jowar , fruit ( apple ) , beetroots and medicinal materials . meanwhile , the main crops regions owning advantage and combination of advantage crops in each region in shanxi have been gained 在文章的实证研究部分，本文以山西省及各地区的主要种植业作物和品种为研究对象，做了以下几方面的研究：测定和分析了山西省主要的粮食作物(小麦、玉米、谷子、大豆、高粱和薯类)和主要经济作物(油料、棉花、麻类、甜菜、烟叶、药材、蔬菜、瓜类和水果)的规模优势、效率优势和综合优势并与全国主产区进行了比较；对山西省主要的种植业品种(小麦、玉米、谷子、大豆、高梁、棉花、油菜籽、甜菜、烤烟和苹果)的规模优势、效率优势、效益优势和综合优势进行了测定和分析；测定和分析了山西省主要种植业作物在各地区的竞争优势，研究表明山西省具有比较优势的作物主要有谷子、高梁、水果(苹果) 、甜菜和药材，同时得出山西省主要作物优势产区和各地区优势作物组合。
