相关实验视频
Updated: Jul 12, 2026
11:49
Cereal Crop Ear Counting in Field Conditions Using Zenithal RGB Images
Published on: February 2, 2019
概括
准确的全球作物生产预测对于粮食安全至关重要. 一个新的卫星和天气报告系统,在Large Area Crop Inventory Experiment (LACIE) 中进行了测试,显示出可靠的国际作物评估的希望.
科学领域:
- 农业科学 农业科学
- 遥感技术是远程传感技术.
- 国际贸易 国际贸易 国际贸易
背景情况:
- 全球粮食安全受到依赖进口的挑战,反映了对石油的依赖.
- 当前的外国作物生产数据往往不可靠,过时,并且受到经济操纵的影响.
- 作为一个主要的粮食出口国,美国需要及时准确的国际作物信息.
研究的目的:
- 开发和测试一种新的作物库存系统,以便更可靠地预测外国作物产量.
- 解决现有的国际农业数据的不足和不及时性.
- 评估使用卫星遥感和天气数据用于作物监测的可行性.
主要方法:
- 实施一个综合卫星遥感和全球天气数据的作物库存系统.
- 通过大面积作物库存实验 (LACIE) 测试该系统.
- 使用实时数据预测农业产量.
主要成果:
- 该系统成功地生成了1977年苏联小麦生产的实时预测.
- 结果验证了综合卫星和天气数据方法的有效性.
- 该实验证明了准确预测作物产量的潜力.
结论:
- 经过测试的作物库存系统对于实时作物生产预测是有效的.
- 该方法有望扩展到其他国家和作物类型.
- 这种方法可以显著提高全球农业情报的可靠性.
相关概念视频
01:16What is Climate?
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
01:50Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
02:16Light Acquisition
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
01:17Precipitation and Co-precipitation
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
01:12Precipitation Processes
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...