田间的

The emergence regularity and effect on yield of w heat Agromyza albipennis were studied by researching in detail in wheat fields and breeding in laboratory.

摘 要：为摸清麦黑潜叶蝇在天津市的发生规律和对小麦产量的影响，通过田间系统调查和室内饲养观察的方法进行了研究。

Therefore,the experiment of clearance rate and filter rate of Anodonta woodiana was done in the lab to verify its effectiveness.

故以本论文於研究室中进行圆蚌的藻类滤除试验，以期在未来田间试验放养圆蚌中能够有所依据，达到最经济的且有效的处理效果。

In the forth chapter, the mechanism of pyrimidine benzylamine compounds is studied by the conventional bioassay and biochemical methods based on probe compound 104-4. The results presented here indicated that the addition of 5 mg/L of 3 branched-amino acids to sorghum seedling cultures incubated in the presence of 104-4 completely alleviated herbicide-induced stem growth inhibition, but each of Val, Ile and Leu single is only partly effective in reversing 104-4-induced growth inhibition at the same concentrations.

通过先导结构优化策略的实施，筛选出15个高除草活性的4，6-二甲氧基-2-取代嘧啶苄胺类候选化合物，在此基础上，对一些候选化合物进行作物安全性评价试验，实验结果提示化合物103-1和化合物105-3在低剂量下对某些作物有良好的选择性，可作为优选化合物进入田间小区试验。

In the exploitatation and utilization of Bromus stamineus, we must take the different sowing methods and plant densities into account. They have heavy influences on the forage especially in terms of the forage growth. The salt, temperature and water are important factors that affect the seeds germination,which deciding the germination time and germination place.we designed four temperature (15℃,20℃,25℃,30℃) and NaCl density(0.3%,0.6%,0.9%,1.2%) and PEG density(0.126g/gwater,0.186 g/gwater,0.232 g/gwater,0.270 g/gwater).

引进美国无芒雀麦是农业部948项目&旱生灌草植物资源的引进及开发利用&的引进草种之一，为了合理开发和利用它，本论文对引进无芒雀麦和本地无芒雀麦的种子萌发、田间种植和栽培技术3个方面进行了对比研究，比较了两种无芒雀麦生长特性；结合方差分析，确定了引进美国无芒雀麦种子萌发指标和栽培技术指标。

Fungicide experiments showed that 11 fungicides were effective on inhibiting conidia germination and those of 4 fungicides up to 100% on inhibifting mycelium growt...

药剂防治试验表明，有11种药剂抑制分生孢子萌发的效果良好，4种抑制菌丝体生长的效果达100％，两种药剂的田间防效较高。

Two years old seedlings of Elaeagnus mooceroftii and Elaeagnus oxycarpa were chosen and planted in field, then treated by different mount of irrigation in Moyu county of Xinjiang. The relative mean soil water contents of different irrigating treatment were 85%, 70%, 47% and 24%.

在新疆和田墨玉县选取2年生大果沙枣和尖果沙枣实生苗，移植于苗圃对其进行不同灌水量的处理，不同处理的土壤含水量分别为田间持水量的85%、70%，47%和24%。

The rape Erysiphe resistantance was identified in field and lab identification trail, effection of rape yield constitute factor and physiological and biochemical characteristics were studied in this thesis.

本论文通过田间鉴定和室内鉴定的方法对油菜的白粉病抗性进行了鉴定，并对白粉病侵染对油菜产量构成因子、生理生化特性的影响进行了研究，得出如下结果。

Result The result showed that the inhibitory action of isofenphos-methyl on T. harzianum was strongest and the fungistatic rate was 64.37% after treated with 200 μg/ml isofenphos-methyl ,and its EC50 was 119.56μg/ml, the germination rate was 64.25 %. The next was phoxim and phoxim-cyoermethrin mixture, the germination rates were 68.5% and 72.08% when the application concentration was under normal use content, their EC50 of mycelia growth was 285.63 and 251.51 μg/ml.

结果］甲基异柳磷在田间使用浓度(200μg/ml)下对哈茨木霉的菌丝生长和孢子萌发有强烈的抑制作用，抑菌率为64.37%，抑制中浓度EC50为119.56μg/ml，孢子的萌发率仅为64.25%；其次为辛硫磷和辛。

The six groups classified by cluster analysis of SSR markers is consistent with the available pedigree and the result of combining ability. So it is feasible to analyze the genetic diversity of maize population by SSR markers and to distinguish heterotic group by method of mixed sampling.

6个玉米群体的聚类结果与系谱来源和田间配合力测定结果基本一致，说明，用若干单株混合取样分析玉米群体SSR的遗传多样性，进而对不同玉米群体划分杂种优势类群是可行的。

Under imitated daily field microclimatic conditions for heat stress, the rice cultivar "Jinyou63"(which is a hybrid rice combination) was treated with a consecutive 3-day heat stress during meiosis in phytotron. Anther and pollen tissues at different development stages after subjected to heat stress were sampled and analyzed for transverse abnormalities.

本研究模拟田间典型灾害天气条件，在人工气候箱内对杂交水稻&金优63&花粉母细胞减数分裂期进行连续3 d的热害胁迫处理，对处理后不同发育时期的花药组织取样切片观察，从组织、细胞水平探讨水稻受高温胁迫后花药可能出现的早期异常特征。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐