查询词典 cropping

Satellite remote sensing is the most effective means to identify land cover pattern and change on a regional scale, so it should be an important way to discriminate multiple cropping characteristics on a large scale.

卫星遥感是探测大尺度土地覆被格局及变化最有效手段，因此可以作为获取区域和全国尺度作物复种指数的一个重要途径。

In the thesis I think the double-harvest rice and the multiple cropping of rice and wheat increased quite little in fact in Southern Song Dynasty.

本文认为，南宋时期温州的双季稻与稻麦复种对增加粮食亩产量很小。

Due to the differences in natural environment, cultivated land quality and multiple cropping index, there Were differences in cultivated land output. The acreage standard determination of cultivated land quality became one of the key links for regional compensation mechanism of cultivated land preservation.

由于各区域的自然环境、耕地质量以及复种指数的不同，不同区域耕地产出存在差异，耕地质量面积标准的确定成为耕地保护区域补偿机制运行的关键环节之一。

In the South of Hunan with cigarette-rice multiple cropping, the pH is medium and high, the organic matter is high, but the humus content is low in the organic matter; N and Zn are abundant, P is very scarce, about 60% of soils is lack of B seriously.

以年内烟－稻复种连作为主的湘南烟区，土壤pH偏高，有机质含量高，但有机质中腐殖质的比例较低；土壤中的氮和锌比较丰富，钾很缺乏，有近60％的土壤严重缺硼。

Maize ; soybean ; multiple cropping ; increasing yield effect

玉米；大豆；多熟种植；增产效应

The building of the knowledge base can transfer the expertise and the domain experts' experiences on multiple cropping to the agricultural policy makers in an acceptable fashion, thus improving the automation and scientism of agricultural policy making.

该专家系统知识库的建立能将有关多熟种植领域的专门知识和领域专家的经验以可接受的方式传递给农业决策者，从而提高农业决策的自动化和科学化。

Second, the threshold for each feature was brought up by using CART Algorithm. Finally, the multiple cropping index of 15 provinces of Northern China were extracted in 2005. Then, the result was compared with that of former researches, and it shows that DT method is more efficient.

最终，采用MODIS（moderate-resolution imaging spectroradiometer）/EVI数据，提取了2005年中国北方15个省市区的耕地复种指数，与之前的研究结果进行比较验证发现该方法具有较高的提取效率和精度。

Multiple Cropping Index (ratio of sown area and cropland area) is fluctuating year by year due to the changing natural conditions and rural social status, so, getting the change information timely is undoubtedly very important to assess grain yield change and its reasons, as well as to make scientific decision for agricultural development.

复种指数受自然条件和农村社会状况的影响处于不断变化之中，及时获取其变化信息对估计粮食产量变化及其原因和农业发展科学决策有非常重要的意义。

After the initial inoculation of measles vaccine and the effects of multiple cropping well, but with age, measles IgG antibody level decreased gradually, to deal with high-grade primary school (grades 4 to 6), junior high, high school students to carry out measles vaccination and immunization do good response, so the prevention and control of epidemics and outbreaks of measles.

经过麻疹疫苗初次接种与复种后效果良好，但随着年龄的增长，麻疹IgG抗体水平逐渐下降，应对小学高年级（4~6年级）、初中生、高中生进行麻疹疫苗强化免疫以及做好应急工作，从而预防和控制麻疹的流行和暴发。

This study proposed a new method for extracting multiple cropping index on pixel level with multi-temporal moderate-resolution imaging spectroradiometer enhanced vegetation index data based on the crop phenology and decision tree. The method could be divided into two steps.

该文通过深入分析农作物的农时历和耕地的时间序列植被指数曲线的对应关系，提取了反映作物种植模式的特征时相，并以特征时相的EVI值作为特征参量，构建了提取耕地复种指数的决策树方法。

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。