查询词典 crop grass

In practice, developments of crop technology include the same sort of practices adopted elsewhere in the world, namely: to utilize soil and plant testing services to predict N and P requirements, the need for soil amendments to improve soil structure, pH and salinity levels, infestation levels of take-all, the need for additional N after crop emergence, and so on; monitoring the crop's development after emergence, which is practised amongst the more advanced growers; and computer assisted services are used to help with these practices.

事实上世界上任何地方发展作物生产技术都包含相同的内容，即：利用土壤和植株测试服务预报氮磷需求，土壤结构改良的要求、pH及盐渍化程度、全蚀病的感染程度、作物出苗后追施氮肥的需要，等等；监控作物出苗后的发育情况已为更多的先进农民所采用；计算机辅助服务也用来帮助这些生产措施。

The results show, under the long-trem influence of different farming behaviors, the soil, collected from dry-land in low multiple crop index to dry-land in high multiple crop index to composite-land in high multiple crop index, decease in bult density, clay content, total P and activities of catalaes and increase in organic matter, humic acid contents, nitogen, available nitrogen, phosphorus, potassium, soi breathe intensity and urease, phosphatase, protease active content.

选择贵州中部喀斯特山区普定县猫洞小流域地区，通过长期受不同生产行为影响的区域（低复种旱作区、高复种旱作区、高复种复合农作区）的土壤采样分析，结果表明：喀斯特山区小流域土壤在长期不同生产行为影响下，从低复种指数旱作区、高复种指数旱作区到高复种指数复合农作区，土壤容重、粘粒含量减小，而土壤有机质、腐殖酸含量、全氮、碱解氮、速效磷、速效钾、土壤呼吸强度、脲酶、磷酸酶、蛋白酶活性含量依次增大，土壤全钾含量和过氧化氢酶活性却依次减小。

One, the United States promulgated American crop insurance and the brief history that calamity helps 1938 " law of confederative crop insurance ", insurance company of American confederative crop produces according to this law.

一、美国农作物保险与灾难援助的简要历史 1938年美国颁布了《联邦作物保险法》，美国联邦作物保险公司便是根据这个法律产生的。

The development of PC desiderates exact information gained by RS rapidly (Moran et al., 1997), hyperspectral technology which acts as the hot and frontier of RS in the world, is showing outstanding potential in agriculture because of its ability not only to monitor crop and some of its surroundings timely, nondestructively in a big area as the normal RS technology does, but also improve the classification precision and accuracy of agriculture resources and supervise and analyses crop growth and the factors related with crop yield by spectral precision predominance.

精确农业的发展迫切要求遥感技术提供快速、准确的地表信息（Moran等，1997），高光谱遥感技术作为国际遥感科学领域的研究前沿和热点，由于其既具备常规遥感对农作物及其生长环境监测的大面积、适时、非破坏性等优点，同时又能够通过其精细光谱优势提高农业的分类的精度和准确性，动态地监测和分析作物的健康状况与影响作物产量的环境因素，因此其在农业领域已表现出非凡的研究潜力。

"The loss of earnings for this crop year may be in the region US$10 million, for the producers and coffee dealers, and will cost the CIB some J$30 million to J$50 million, relative to the original crop projections of a typical crop year," said Gentles.

相对于通常一个普通咖啡年度的产量预计来说，本年度咖啡农及咖啡商的收益损失将会在1千万美元左右，咖啡工业委员会也会因此损失3千～5千万牙币（1美元=89牙币左右）。

This paper based on Precision Agriculture development of China, and focused on several key problems for developing Precision Agriculture, especially field spatial information distribution processing method. The trail farm is located in Shunyi, Beijing. The area is 11 hectors. We sampled the soil, and got soil spatial distribute data , crop growing status distribute data (such as crop population, crop height, plant dry weight), yield distribute data (such as yield per mu, ears per mu, seeds number per ear, weight of thousand grain, plant yield).

本文在探索我国精细农业发展道路的基础上，以当前开展精细农业实践急需解决的关键问题之一—农田空间分布信息处理方法研究作为切入点，通过对北京顺义&三高&农业示范区一块面积约11公顷的农田进行了定点采样试验，得到土壤空间分布信息、苗情分布信息（株数、株高、地上干物重等）、产量分布信息（亩产量、亩穗数、穗粒数、千粒重、生物产量等）。

The results showed that the best ratio of male parent to female parent was 1:3, and 210 kg/hm2 N fertilization was better. It indicated that hybrid seeds production in two crop seasons, especially the second crop season based on the utilization of ratoons of flue-cured tobacco which regenerated after hybrid seed was harvested in the first crop season, was beneficial to higher seed yield, lower cost, and less laborers employed as well.

结果表明，烟草杂交制种父母本比例以1：3较好；在中等肥力田块制种头季以施纯氮195~210kg/hm2较理想；利用头季杂交种收获后萌生的腋芽进行杂种二季制种在提高杂种种子产量，降低劳动量和生产成本等方面具有较理想的效果。

In China, crop strews and energy crops are the main resource of bioenergy under the condition of secure food safe. There are lots of resource of crop strew, and only the main tree food crop can produce about 0.5 billion ton strew, which can maintain soil carbon and was used as the resource of bioenergy. In addition, there are about 0.1 billion hm2 waste hills and and that is suitable for farming or forestry can be used for the development of agriculture and forestry energy.

在保证粮食安全的前提下，农作物秸秆和能源作物则是生物质能的重要原料，我国农作物秸秆资源丰富，仅三大粮食作物每年就可以产生5×10~8t左右的秸秆，除了部分还田以保持土壤碳含量外，尚有可用于生物能源的部分，此外我国尚有近1×10~8 hm~2宜农、宜林荒山荒地，可用于发展能源农业和能源林业，而且我国能源农林业物种资源非常丰富，农业主要有木薯、甘蔗、甜高粱、油菜、花生、向日葵等，林业有漆树科的黄连木，无患子科的文冠果，大戟科的小桐子，山茱萸科的光皮树等，以此为原料可以进一步加强我国的生物液体燃料等的生物质能利用方式。

A definition of crop condition can be defined by its individualities and group characteristics. Two models were developed for crop condition assessment and diagnosis based on vegetation index and crop surface temperature.

该文以冬小麦为例，根据实地调查与北方数省的资料，用作物的个体与群体特征定义作物长势，讨论了遥感监测的可能性，提出了基于植被指数与植被表面温度的长势遥感监测的评估模型与诊断模型的概念与算法。

To detect the position of crop-rows, a method based on Hough transform and connected component labeling was put forward. First, a true color image of field crops was processed with gray histogram and OSTU respectively. Then the noises in the image were eliminated by means of eight connected component labeling according to their areas. The centroid coordinates of each labeled crop were computed after the second labeling, through which the center line of the crop-row was regressed by Hough transform. Experimental results show that the method is effective.

该方法分别用直方图法和最大类间方差法二值化图像后，经过8连通区域标记后据其面积属性去除噪声，然后再经一次标记后找出各标记作物的重心点坐标，最后通过Hough变换检测过重心点的直线，即到得到过作物行的中心线，试验结果表明了该方法的有效性。

Hanna: That's over now, isn't it?

都结束了，对吗

You must be ill. You look so pale.

你一定是病了，你的脸色苍白。