Mapping within-field leaf chlorophyll content in agricultural crops for nitrogen management using Landsat-8 imagery

Precision Agriculture - Spatial information on crop nutrient status is central for monitoring vegetation health, plant productivity and managing nutrient optimization programs in agricultural...     

Estimation and mapping of nitrogen content in apple trees at leaf and canopy levels using hyperspectral imaging

Precision Agriculture - Accurate and rapid diagnosis of nitrogen status in fruit trees on an individual tree basis is a prerequisite for precision orchard nutrient management. This study presents a...     

Estimation of the vertically integrated leaf nitrogen content in maize using canopy hyperspectral red edge parameters

Precision Agriculture - Real-time monitoring of leaf nitrogen (N) content by remote sensing can accurately diagnose crop nutrient status and facilitate precision N management. However, the methods...     

Prediction of soil nutrient content via pXRF spectrometry and its spatial variation in a highly variable tropical area

Precision Agriculture - Precision agriculture provides detailed information on the spatial variability of soil properties, including nutrient content, allowing for local-specific decision making....     

Delineating soil nutrient management zones based on optimal sampling interval in medium- and small-scale intensive farming systems

Precision Agriculture - Soil nutrients vary greatly and information regarding their spatial-temporal variability is critical for achieving site-specific nutrient management. However, the problem is...     

Production limits analysis of rain-fed maize on the basis of spatial variability of soil factors in North China

Precision Agriculture - In precision agriculture, suitable soil moisture and nutrient levels are important for crop production. Therefore, studying the spatial variability in soil moisture and...     

农业养分资源精准管理研究进展

对传统农业养分资源管理面临的挑战作了扼要分析;对精准农业及其核心技术作了初步介绍;对空间变异研究进展作了简要讨论。     

基于GIS与GPS的中国农村精准施肥的方法研究

在利用GIS和GPS研究土壤养分空间变异的基础上,以农户作为精准施肥的单元,探讨在中国农村进行精准施肥的途径。结果表明,不同农户地块养分存在一定空间变异性,由此导致相邻农户施肥量存在差异性,而采用农户为单元的施肥推荐既可以避免土壤养分空间变异造成的推荐施肥偏差,又可考虑中国农村分散经营的实际的状况,从而使土壤养分管理更加精细化。     

Influence of time of day on measurement with chlorophyll meters and canopy reflectance sensors of different crop N status

Precision Agriculture - Optical sensors are a promising approach for assessing nitrogen (N) status of vegetable crops. However, their potential may be undermined if time of day influences...     

The challenge of reproducing remote sensing data from satellites and unmanned aerial vehicles (UAVs) in the context of management zones and precision agriculture

Precision Agriculture - Mapping the within-field variability of crop status is of great importance in precision agriculture, which seeks to balance agronomic inputs with spatial crop demands....     

Recalibrating plant water status of winter wheat based on nitrogen nutrition index using thermal images

Precision Agriculture - Accurate and timely assessment of crop water status is imperative for in-season irrigation scheduling in crop production. The canopy water stress index and water deficit...     

精准施肥对小白菜产量、品质及土壤特性的影响

按照蔬菜精准施肥推荐系统小白菜的推荐施肥量,在田间进行了验证试验。结果表明:推荐施肥量处理的小白菜产量最高,达36868.5kg.hm-2,小白菜硝酸盐含量较低,肥料利用率在所有施肥处理中最高,种植者纯收益最大,达54271.65元.hm-2,并且种植后土壤养分变化以及酸碱度、电导度、有机质含量等多个指标的变化趋势都优于其他处理,不会造成土壤中盐分累积,因此说明该系统用于推荐露地小白菜生产的施肥量是准确和可靠的。     

Supporting operational site‐specific fertilization in rice cropping systems with infield smartphone measurements and Sentinel-2 observations

Precision Agriculture - Due to the low efficiency of nitrogen fertilizers in flooded rice paddies, there is a rising demand for tools able to detect crop nitrogen status in space and time to allow...     

An assessment of multi-view spectral information from UAV-based color-infrared images for improved estimation of nitrogen nutrition status in winter wheat

Precision Agriculture - Rapid, accurate and non-destructive assessment of nutrition status is beneficial not only to the optimization of fertilization strategy in crop production, but also to the...     

The role of GIS and GPS in precision farming

Examinations in connection with site-specific farming have been carried out by our institute since 1998. Precision farming is a way of agricultural production, which takes into account the in-field variability, a technology where the application-seeding, nutrient replacement, spraying, etc. has taken place to act on the local circumstances of a given field. The geographic information system (GIS) created by computing background makes possible to generate complex view about our fields and to make valid agrotechnological decisions. Our goal was to compare two systems for marking out further research tasks, because in some cases there have been misunderstandings among the researchers, and the information provided by given companies seems to be complicated for potential users (famers).     

Design considerations of variable rate liquid fertilizer applicator for mature oil palm trees

Precision Agriculture - This research study focuses on the design of variable rate liquid fertilizer applicator which can measure the NPK status of soil and applies N, P and K nutrients...     

葡萄植株营养诊断与平衡施肥调节技术研究应用

通过在葡萄花前一周、花后一周、生理落果和果实膨大四个关键生长时期,采摘成熟叶的叶柄分析植株大量和微量元素含量,计算元素养分丰缺指数,根据养分丰缺指数指示的养分元素在葡萄体内的丰缺状况,结合目标产量和葡萄营养规律制定营养调节方案,叶面喷施葡萄专用肥.结果表明:叶面施肥可使葡萄增产9;～20;,葡萄可溶性固形物较对照提高4;～14;(绝对值),酸度下降4;～18;,Vc含量有明显的增加,通过计算增加的收益,产投比在1/3.5～1/34.6.所采用的葡萄营养诊断和调节方法增产、改善品质,成本低、方法简便,是葡萄生长期营养管理的一种有效方法.     

中国不同区域农田养分输入、输出与平衡

 弄清中国不同区域农田养分投入、产出和平衡状况,对养分资源管理和肥料的科学分配与施用,提高肥料利用效率等具有重要意义。在参考现有资料的基础上,系统分析和论述了中国的养分资源及其利用现状,估算了各种有机肥资源及其可提供的氮磷钾养分数量,分析和评价了中国不同区域养分输入、输出特点及平衡状况。针对目前养分输入、输出存在的一系列问题,提出了养分资源管理的对策和建议。     

灌木层及主要灌木种在椴树红松林养分循环中的地位与作用

对原始椴树红松林中的灌木层及主要灌木种（毛榛子、溲疏和刺五加）的生物量、养分量、存留量、归还量、吸收量、循环速率等方面在林分的养分循环中的地位与作用进行了研究。研究结果表明：灌木层虽在林分的养分循环中处于次要地位,但具有促使林分养分步入良性生物循环的重要作用。毛榛子和溲疏是该林分灌木中的优势或亚优势种,在养分循环中起着重要的或突出的作用,是重点保护的灌木种。刺五加在养分循环中存留养分比较多,归还养分比较少,虽然消耗地力却是具有药用的灌木种,对它应既维持又要控制。     

浅谈精准农业在土地整理项目区的发展思路

简要介绍了精准农业系统工程的内涵,在明确湖北省安陆市辛榨等两个乡土地整理项目区具体情况的前提下,分析了精准农业及其相关技术思想在国家投资湖北省安陆市辛榨等两个乡土地整理项目区的应用意义、发展优势和重点发展方向.