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The results showed that:(1) low N stress significantly decreased the leaf SPAD value, leaf nitrogen content, nitrate reductase activity and reduced distance between leaf-umbrella, leaf area. And these impact aggrandized as the stress intensity increased.(2) Responses to low-N stress were in different degrees between different varieties of rubber tree seedlings. On the whole, GT1 was most sensitive to stress, PR107 next, and RRIM600 was the least sensitive.(3) The SPAD value, DBL, LA were significantly positive correlated with LNC, NRA in the seedling leaves.

结果表明：（1）缺N胁迫明显降低了叶片SPAD值、叶片N含量和硝酸还原酶活性，缩小了叶蓬距、叶面积，且影响幅度随胁迫强度的加大而增大；（2）不同品种橡胶树实生苗对缺N胁迫的响应程度不同，总体上GT1较为敏感，PR107次之，RRIM600较不敏感；（3）橡胶树实生苗叶片SPAD值、叶蓬距、叶面积与叶片N含量、硝酸还原酶活性之间均呈显著或极显著正相关。

According to analyzing the relations between tar content and physical and chemical characters in flue-cured tobacco leaf,some measures of cultivation and flue-curing techniques on reducing tar content were summarized: cultivating and popularizing low tar content of tobacco varieties: increasing the potassium content of tobacco leaf by the adding the application to K fertilization; seizing the proper stage of topping and height and height and suckering in time;far improving the maturity of tobacco leaf; confirming a feasible process of flue-curing; developing and generalizing planting method anything else that could produce low tar content of tobacco leaf.

通过分析烤烟焦油产生量与烟叶的理化特性之间的密切关系，综述了降低烤烟焦油含量栽培调制技术措施：选育并推广焦油量低的烤烟新品种；增施钾肥，提高烟叶含钾量；把握打顶时期和高度，及时除芽；进一步提高烟叶成熟度；确定适宜的烘烤工艺；开发推广低焦油烟叶的其他栽培技术。

This research take late-maturing variety adzuki bean Jihong-4 as the experiment material, After the photoperiod inducement at different leaf ages treatment, the result showed that the activity of NR under LF treatment is higher than CK treatment on the whole, and is lower than SD treatment; The content of the dissociation amino acid under these three treatments show a descend trend along with the leaf ages accretion, but the inducement increasing the content of dissociation amino acid, different leaf ages leaves show some difference, and alternating rise with SD treatment; Inducement can reduce the content of soluble sugar, and continuous inducement shows a accumulation effect; 2LF is the most sensitivity stage for soluble protein under photoperiodic inducement, From this stage, each leaf indumenta can reducing the content soluble protein, but continuous inducement reducing rising it.

本研究通过光周期诱导的方法，对中晚熟品种冀红4号红小豆进行不同叶龄进行处理，结果表明：所有叶龄处理下硝酸还原酶活性基本高于自然光处理而低于连续短日照处理下的；随着叶龄增大，各处理游离氨基酸总量均呈下降趋势，但光周期诱导可提高游离氨基酸含量，不同叶龄表现有所差异，与连续诱导交替上升；诱导可降低可溶性糖的含量，并连续诱导出现累积效应；2LF是光周期诱对可溶性蛋变化最敏感的时期，这个时期起单个叶龄诱导可降低可溶性蛋白含量，但连续诱导却可提高；LF处理下的类胡萝素总体含量高于另两个处理，而LF处理下的叶绿素含量在仅3叶龄前高于CK处理下的，随后出现下降趋势。

But there existed significant difference in the form of leaf base , leaf length, leaf width and micro-morphology characteristics of the leaf epidermis（the cell number of the adaxial epidermis and abaxial epidermis, the stomal length,the stomal width,the stomal density）.

结果不同叶型的冬凌草其表皮细胞的形状、气孔类型均相同，但其叶基形状、叶长、叶宽、叶表皮微形态特征（上表皮细胞和下表皮细胞的数目、气孔长度、宽度及气孔密度等）存在明显的差异。

The standard deviation of factor, regerssion equation and correlation coefficient between estimated and actual leaf area all demonstrated the adequency of the model The leaf length and width were used to calculate total leaf area per plant for Phalaenopsis white hybrid grown in phytotron at various day/night temperature After 9-month experiment, plants grown at 30/25℃ increased 1.4 and 3.8 times total leaf area compared with plants grown at 25/20℃ and 20/15℃, respectively.

由於检定有共同斜率之存在，故不计大小可求得共同估值的0.825，并由常数之变异范围、叶面积估值与实际叶面积之廻归方程式及相关系数确知其适用性，以叶面积估算决比较不同温度对白花蝴蝶兰生长之影响，则不论叶幅、叶面积增加量、长叶率均以日／夜温30／25℃增加量最大，其叶面积增加量为25/20℃之1.4倍，20/15℃之3.8倍。

Fresh leaves do not adopt rainwater harvesting leaves, leaf insects, the leaf folder, leaf fish, purple leaf, batch picking, grading frying.

鲜叶采摘做到不采雨水叶、虫叶、对夹叶，鱼叶、紫色叶，分批采摘，分级炒制。

Considering many biophysics processes such as the atmosphere,hydrology,plant leaf N content et al.a multiple layer,two-leaf canopy model for predicting of mass transportation and energy exchange between plant canopies and the atmosphere has developed after dividing the canopy height into three layers,and the sunlit and shaded leaf area index was computed respectively at different layers through introducing a foliage clumping index,it is important to distinguish the spatial light distribution and so leaf photsynthesis.

多层—双叶模型对冠层上方碳通量的模拟：综合考虑农田水、热因子及叶片氮含量的非线性垂直分布对碳、水循环的影响，将农田按植株高度分为上、中、下三层，并通过叶片集聚指数计算阴、阳叶面积以区分叶片的空间分布受光状态，建立了均匀农田与大气间物质输送和能量交换的多层—双叶模型，对农田冠层上方基于光合—呼吸的碳循环过程进行了模拟应用研究。

After 18 tea leaf producing factories were investigated,the results showed that the tea leaf of goodgrade in the factories would alleviate the lead contamination in the tea leaf ,while the commer tea leaf producing process can significantly increased the lead contamination in tea lead.

通过对18个茶叶生产厂家的分析调查发现，精制茶的生产工艺对茶叶的铅含量在总体上有降低作用，而粗制茶的加工工艺却有增加的趋势，因此茶叶生产工艺对茶叶的铅含量影响很大。

After 18 tea leaf producing factories were investigated,the results showed that the tea leaf of goodgrade in the factories would alleviate the lead contamination in the tea leaf,while the commer tea leaf producing process can significantly increased the lead contamination in tea lead.

通过用水清洗鲜叶发现，茶叶表面有相当一部分的铅可以洗脱下来，这说明在茶叶的种植过程中，大气中粉尘沉降对茶叶也有铅污染的作用。

The pickled cabbage special product of for the Yunlin County Tabision township, approximately has 1,500 hectares agricultural planters package of heart leaf mustard every year, usually around sows seeds in every year beginning of winter, approximately 80-100 day then recovers, is before the field insolation to expose to the sun 2 - 3rd, to the fading after some degree, except the tail leaf, the lamination shop makes in the big salt barrel to the cement, a leaf mustard, salt, generally speaking, 100 kilograms leaf mustards use 15-18 kilogram salt.

酸菜为云林县大埤乡之特产，每年约有 1，500公顷农地种植包心芥菜，通常在每年立冬前后播种，约80-100天即可采收，先於田间曝晒2－3日，到萎凋至某一程度后，除去尾叶，分层铺於水泥做成之大腌桶内，一层芥菜，一层盐，一般而言，100公斤之芥菜用15-18公斤之盐。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。