查询词典 crop index

Results indicate that:(1) by using HANTS, the researchers could get the EVI/NDVI harmonic curves, the mean VIs and the amplitude of the harmonics which then were utilized in the identification of the cultivated land, and EVI appeared to be more precise, with the overall accuracies of 97.17% and 95.99% and Kappa coefficients of 0.7938 and 0.6518, respectively.(2) Multiple cropping index was extracted by counting the number of the curve's peak; and when the threshold of the peak value of the NDVI and EVI curves were set as 0.25 and 0.20, respectively, the fallow land could be well figured out.(3) From harmonic curves, some eigenvalues, such as time of the maximum growth rate, time of peak and the value of peak can be extracted, based on which the crop types can be primarily distinguished. And EVI still performed better than NDVI in this section.

结果显示：（1）利用傅立叶谐波变换得到的EVI和NDVI时间谱曲线的谐波余项及谐波振幅对耕地进行识别，从识别精度来看，EVI要优于NDVI，识别精度分别为97.17%和 95.99%，Kappa系数分别达到0.7938和0.6518；（2）通过计算时间序列曲线的波峰数能够提取耕地的复种指数，并且在EVI和NDVI曲线波峰阈值分别设为0.20和0.25时，休耕地能较为准确地被识别出来；（3）通过提取作物生长期内曲线的VI最大增长速率时间点以及峰值时间点等信息，作物种类能被初步识别，并且EVI较NDVI具有更强的识别能力。

The spraying control system aiming at weed based on machine vision was designed and developed. The index of 2G-R-B is used for segmentation and the method of improved pixel lateral histogram is used for extracting the center of crop row,the method of threthold is also used for identificating between-row weed and BP ANN based on fratal and texture is used for identificating in-row weed. PLC correspondence and performing procedure is desi -gned and developed.

设计和开发了基于机器视觉的麦田除草剂对准喷药控制系统，该系统的视觉子系统首先用过绿的2G-R-B进行植物与土壤背景的分割，其次用改进像素直方图法识别作物中心行，用阈值法识别行间杂草区域，用BP神经网络基于分形和纹理的共同特征识别行内杂草区域，设计并开发了计算机与PLC的通信程序，设计了PLC的运行程序。

In the second stage, Crop Water Stress Index, which was based on canopy energy balance and used the hand hold infrared thermometry, was represented.

加强这一类指标的研究对于我国北方地区农作物的有效灌溉和区域水资源的管理都有重要意义。

The results indicated SOM content in the surface layer took on a rising tendency in the last twenty years in Quzhou,Hebei province. The change of geoponic practices, including the dosage augment of fertilization, straw returning to field, reclamation of salinity soil, increment of irrigation area, enhancement of index of multiple plantation and positive SOM balance of the dominant cropping pattern and crop planting, contributed to the increment of SOM.

结果显示，在过去的近20年间，曲周县土壤表层的有机质含量呈现增长的趋势，导致这种变化的农作管理方式有化肥施用量的大幅度提升、秸秆还田量的增加、盐碱地的开垦利用、灌溉面积和复种指数的提高以及主要种植模式和种植作物的土壤有机质处于正平衡状态。

The results indicated SOM content in the surface layer took on a rising tendency in the last twenty years in Quzhou, Hebei province. The change of geoponic practices, including the dosage augment of fertilization, straw returning to field, reclamation of salinity soil, increment of irrigation area, enhancement of index of multiple plantation and positive SOM balance of the dominant cropping pattern and crop planting, contributed to the increment of SOM.

结果显示，在过去的近20年间，曲周县土壤表层的有机质含量呈现增长的趋势，导致这种变化的农作管理方式有化肥施用量的大幅度提昇、秸秆还田量的增加、盐硷地的开垦利用、灌溉面积和復种指数的提高以及主要种植模式和种植作物的土壤有机质处於正平衡状態。

The article adopted a new filtering-cloud composing technology used to monitoring drought,analyzed the property of Ts—NDVI characteristic space and the TVDI's indicating drought ability, put forward the TVDI compute model, grade standard, and the impact estimation method. The result indicated: 1 the decade-composed data obtained by the maximum surface temperature principle has better ability than the composed data obtained by the maximum NDVI on monitoring drought; 2 in the Ts-NDVI characteristic space,the dry side and the wet side almost are horizontal lines when the NDVI is on the small side, the temperature difference is about 45℃; 3 the TVDI has inequable level on monitoring drought as its value, the less TVDI indicates without drought occurrence, the bigger TVDI shows the drought certainly happened, the unsure drought conclusion mainly comes from the middle TVDI; 4 the monitored results of Sichuan hot-drought in 2006, obtained by the remote sensing and by the climate index, are basically consistent, the estimating error on the bearing drought crop area and on the drinking trouble population is within 10%.

采用了干旱监测合成滤云新技术，分析了Ts—NDVI特征空间属性和TVDI指数干旱监测能力，提出了四川伏旱TVDI计算模型、分级标准、和影响评估方法，结果表明：1按最大地表温度原则得到的旬合成数据比按最大植被指数原则得到的旬合成数据具有更强的旱情监测能力；2在Ts—NDVI特征空间中当NDVI较小时干湿边几乎同为水平直线，两者相差约45℃；3TVDI指数因其大小不同而对旱情的监测能力也不一样，较小时说明没有干旱发生，较大时则一定有干旱发生，中间段对干旱的监测具有不确定性；42006年四川伏旱遥感监测与气候监测结果基本一致，农作物受旱面积与饮水困难人口数估算误差在10%以内。

However, with crop growth, leaf area index expanded, mutual shading phenomenon gradually increase.

但是，随着作物的生长，叶面积指数扩大，互相遮荫现象逐渐加重。

Although not much village land is not abandoned, but the index of multiple crop is not high, and yield is not large.

研究分析发现这与大量的农村劳动力外出务工有很大关系。

In this paper, the concept of sensitive index of crop yield to water deficit is presented. In line with the concept, the forms of average SI , normalized SI and marginal SI are given.

本文提出了作物对水分亏缺的敏感性指标的定义，基于此定义，给出了平均敏感性指标、概化的敏感性指标以及边际敏感性指标的具体表达式。

It was studied that the ratio, contributed by natural factors and social economic tactors to quality of cultivated land using CIS in consideration with the productivity indicator crop as quality index.

耕地质量是耕地的综合属性，它的构成要素包括自然因素和社会经济因素 [1-3]，二者在属性特征上的差异决定了其在耕地质量管理等工作中的作用与管理措施的差别。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。