大田

Four winter barley cultivars, named Yangsimai 3, Yangsimai1, Supi 2 and Yangnongpi 2, were used to study N fertilization on nitrogen accumulation and translocation at the stage of grain filling under field condition.

在大田条件下，以扬饲麦3、扬饲麦1、苏啤2号和扬农啤2号等4个品种为供试材料，在0，75，150，225 kg/hm2 4个氮肥处理水平下，研究了大麦花后穗部氮积累及转移的规律。

The relation between the wilting point with the soil physics characters as clay content,organic matter content and the salt content have been studied based on the experiments in field.

基于清徐大田土壤试验研究了土壤的凋萎系数与其土壤物理性粘粒含量、有机质含量以及土壤全盐含量之间的关系。

The results of yield and water use efficiency in field show that yield can not reduce, butwater use efficiency can increase significantly from 〓 to 〓 when alternateirrigation by interval furrow compared to the well-irrigated plant. In 1997 and 1998,the resultsof field trails show that seeds yield is above 8000kg/ha meanwhile irrigation water can save from〓 to 〓 or 〓, about more than 33% water can be saved, water-saving profit is significant.

大田小区试验产量和用水效率结果表明：隔行交替灌溉后灌溉用水效率明显增加，可由常规灌水的〓提高到〓以上，总用水效率〓以上，1997-1998年两年试验结果表明籽粒产量保持8000kg/ha以上高产水平的同时灌溉用水量可由〓降至〓，甚至〓，节水达33.3％以上而不引起产量下降，节水效益显著。

The experiments were designed to compare the result b6tween the selected on farm trial with recommendation and input package (good seeds, fertilizer, herbicide and insecticide) and no inputs. The complete fertilizer 12-14-12 at the rate of 150 kg/ha was applied at 15 days after emergence.

在选定的几个大田试验点上，设计了有按推荐一揽子投入（包括良种、化肥、除草剂和杀虫剂）和无投入的产量对比试验，出苗15天后施完全肥料12-14-12，施肥量为150公斤/公顷。

Correlation and stepwise multiple regression between main chemical compositions of tobacco leaves and climate factors in different stages during the growing season in different tobacco-growing areas were performed under the same cultivation conditions.

主要化学成分和大田生长期不同时段的气候因素进行多元相关及逐步回归分析，初步获得了两烟区烤烟化学成分的主导气候影响因子。

Correlation and stepwise multiple regression between main chemical compositions of tobacco leaves and climate factors in different stages during the growing season in different tobacco-growing areas were performed under the same cultivation conditions.

根据纬度差异和地理方位，将我国主产烟区的7省12县分为南北两大烟区，采用统一栽培模式，对两区烤烟（Nicotiana tabacum L，）主要化学成分和大田生长期不同时段的气候因素进行多元相关及逐步回归分析，初步获得了两烟区烤烟化学成分的主导气候影响因子。

As another effective practice of optimium management of crop nutrient input, a physiological technique was successfully developed to decrease the requirement of K fertilizer to grow tobacco, and also increase K content and qualification of tobacco product.

研发出一种植物生理调节技术，大田试验证实可大幅度降低烟草对钾肥需求，提高烟叶钾素含量（15%～30%）和综合品质。

The low rate (150 Mg kg/hm~2), the middle rate (300 Mg kg/hm~2) and the high rate (450 Mg kg/hm~2) were experimented to study the yield and qualities formation and growth of flue-cured tobacco under different magnesium fertilizer application.

2005年在湖南常宁市大田栽培条件下，以云烟87为供试验烤烟材料，采用漂浮育苗移栽，进行3次重复的随机区组试验，研究了在低镁水平(150kg/hm~2)、中镁水平(300kg/hm~2)和高镁水平(150kg/hm~2)三种不同施镁水平下，烤烟的生长发育、烤烟光合强度、蒸腾强度、烟株Mg~(2+)及干物质积累动态、产量、烟叶品质、经济性状和经济效益等烤烟生长发育的生理化学指标。

Although effects of nitrogen fertilizer on nitrogen accumulation and nitrate reductase in tobacco leaf had been extensively studied, impacts of nitrogen fertilizer on flue-cured tobacco leaf nitrogen metabolism in dry land and paddy field were not well documented.

试验采用裂区设计，以硝态氮和铵态氮两种氮素形态为主处理、5个供氮水平为副处理，在大田条件下研究了水田与旱地烤烟在团棵、旺长、脚叶采烤、腰叶采烤和顶叶采烤等5个生育期烟叶的总氮浓度、硝酸还原酶和谷酰胺合成酶活性的氮肥效应。

Biocontrol may be an alternative to avoid these problems in tobacco disease control. Ata28 strain is an antagonistic bacterium against tobacco brown spot was isolated from healthy tobacco in Chongqing.

Ata28菌株是从重庆烟区烟草健康植株上分离获得的烟草赤星病拮抗细菌，在PDA平板上可明显抑制烟草赤星病强致病力菌株Tbs3的生长，温室控病效果较好；为了进一步提高拮抗细菌Ata28菌株对烟草赤星病的防治效果，本研究采用紫外线、紫外线和氯化锂、硫酸二已酯及微波对Ata28菌株进行诱变选育，以期获得拮抗性能更强，生物学性状更好的优良菌株，为大田使用提供理论依据和实践经验。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。