Estimation of Maize Growth and Nitrogen Nutrition Status Using Color digital Camera Image Analysis
作者单位：Institute of Crop SciencesChinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and EcologyMinistry of Agriculture
会议名称：《2014年全国青年作物栽培与生理学术研讨会》
会议日期：2014年
基 金：National Key Technologies R&D Program of China(2011BAD16B14) National Maize Industry Technology RD Center(CRRS-02)
关 键 词：spring maize digital camera canopy cover LAI shoot dry weigh shoot N accumulation
摘 要：[Introduction]Canopy cover(CC) is a good predictor variable for plant growth parameters such as leaf area index and aboveground biomass.A nondestructive,low-cost,and convenient method is presented for estimating CC using digital camera image *** was estimated by the ratio of plant pixels to total pixels of digital camera image of maize *** objective of the present study was to construct a non-destructive method for monitoring maize growth and nitrogen(N) nutrition status with digital camera image analysis.[Materials and Methods]Digital images of maize canopies grown with cultivars(Zhongdan 909) under various nitrogen treatments were captured by a digital camera periodically before V12 and at the same time maize plants were sampled to measure LAI,shoot dry weight,and shoot N accumulation in 2014 at Agricultural Experimental Site of Scientific Observation Station of Ecological and Environment,at Langfang *** and ten color indices were calculated from digital camera images using Maize CC Image Analysing System developed in Visual Basic version 6.0(Institute of Crop Sciences,Chinese Academy of Agricultural Sciences 2013).[Result and Analysis]More than eight color indices and CC showed significant correlations with growth and N nutrition parameters like LAI,shoot dry weight,and shoot N *** revealed the highest correlations with all of ***(variables) expressed a curve-linear relationship with LAI,shoot dry weight and shoot N accumulation(dependent variable) being well fitted to a exponential function:y=*** statistically different relationships of CC with parameters a and b were found among N fertilization levels as a values decrease and b values increase with the increase of N fertilization *** compensate the effects of N level,stepwise multiple linear regression(SMLR) models including nonlinear relationship of CC and color indices were calibrated and *** selected SMLR models for LAI,shoot dry weight,and shoot N accumula