Comparison Models For Predicting Spring Wheat Chlorophyll Content Of Irrigated And Dry Land

Food as the basic consumer goods of human life, the supply and demand candirectly effect China’s economic development and social stability for a long time.Third plenary session of the Eighteen showed that guarantee food safety is an eternalsubject of the social development in the future in our country, we can not look downon food security any time.Qi Tai is not only a big country of producing food in xinjiang uygur autonomousregion, but also is a key grain production counties in the whole nation, economybased on agriculture, the area of cultivated land are more than150ten thousand mu,and located43°to45°north latitude, Qi Tai received many wards because of the agood harvest of grain in the past, It was rated as the big national grain productioncountry, the hometown of high-quality of wheat in2002,and included in the nationalgrain production counties in1995and2003.the area of cultivated land has beenreached to1.87million unit of area in2013, planting wheat occupy60%of thecultivated land, wheat is planting in flat and irrigate or piedmont area in Qi Tai, manyfamous scholars pay attention to irrigated land,few pepole study on dry land, Toensure food security, we should make full use of irrigated and dry land, improve unitoutput of grain.The measured spectrum contain detailed spectral information, and provideimportant data based on ground of the measured spectrum for estimating large area ofcrop-yield by remote sensing. The different spectral signatures of wheat in the visibleand near-infrared is mainly by its physiological and ecological parameters(chlorophyll content, leaf width, height). The physiological and ecological parametersof spring wheat reflects its growth at a certain stage, therefore, to monitor their growthstatus based on canopy spectral characteristics of spring wheat. This helps to taketimely measures to prevent plant diseases and pests of spring wheat for improving grain yield. Chlorophyll is an important pigments for a green plant photosynthesis,obtained the energy for growth and development,which is based on estimating modelof spring wheat in different growth period of chlorophyll which are also the measuredspectra, which have a great significance for improving China’s grain production andensuring food security. In this paper, three different irrigated and dry land springwheat for the study slope to analysis the physiological and ecological parametersmeasured spectra irrigated and dry land spring wheat. Using regression analysis toestablish chlorophyll content model about irrigated and different aspect dry landspring wheat. in order to provide important basic data which establish a quick andefficient large-scale remote sensing estimation of wheat yield. The main conclusionsare as follows：The chlorophyll content of spring wheat in dry land are less than irrigated land atdifferent growth, canopy spectra of spring wheat in irrigated land has two valley andone peak(blue and purple, red valley and green peak),and the spectral reflectance waslower than spring wheat in dry land, the "peak valley" of dry land is not obvious, theleaf width, seedling height and coverage of dry land are less than irrigated land, so isspectral reflectance, The reason is that internal structure is different from irrigatedland. Red edge is the most obvious characteristics of canopy spectra in spring wheat,red edge parameters of spring wheat in irrigated and dry land are vary, it showed thatred edge position towards to long wave direction from setting stage to flowering stage,and namely red shift, to flowering stage, from flowering stage to milk stage, ittowards to shortwave again, namely blue shift, The red edge peak of irrigated and drylad has “single-peak” phenomenon at setting stage and milk stage, and reflect “doublepeak” phenomenon at the third phase of middle, double side slope has “double peak”at heading stage and flowering stage, and exist “single-peak” in other stage, in thewhole growth, sunny land has "single-peak" in the whole growth period. the area ofred edge of spring wheat in dry land were less than spring wheat irrigated land. There is a good correlation between chlorophyll content of spring wheat atjointing stage in different land and high spectral variables, No matter in the visiblelight or near infrared wave band, lg(1/R)was correlated significantly with the leafchlorophyll content, Correlation coefficients can reach0.95; Yin slope has a bettercorrelation with first derivation(0.92), the best correlation for sunny and double slopewas Normalized difference vegetation Index(0.94). Each of band, lg(1/R), p′, N is thebest model estimate spring wheat chlorophyll content of irrigated land, Yin slope land,sunny and double slope land. There is a a good correlation between Kpv, SDred,SDgand chlorophyll content of Yin slope land, sunny and double slope land. Parabolicmodel is the best model to estimate chlorophyll content of spring wheat in dry landIt exist significant correlation between chlorophyll content of spring wheat indifferent land with MSAVI2and PSRI At setting and milk stage, chlorophyll content inspring wheat of irrigated and shady land at jointing and heading period is closely toGNDVI.At flowering stage, correlation best with mNDI. Sunny land are associatedwith MSAVI2showed a significant correlation. the best estimation model of springwheat at different land are imparity, the parabolic model of irrigated spring wheat isthe optimal estimation model in the first four periods, but milk stage was fit for powermodel, index model is the best model of shady at setting stage, so is sunny anddouble-sided land. the correlation between red edge position with chlorophyll contentof spring wheat in irrigated and dry land is very good, the linear model is the bestmodel to estimate chlorophyll content.