Research On Crops Spectrum Characteristic Under Different Nutritional Condition

The winter wheat and the summer corn are the Guanzhong area most main grain crops. Through the monitor the winter wheat and the summer corn's spectrum reflection characteristic and its with the agronomy parameter between relations in different growth stage under the differen level fertilizer, may carry on the remote sensing for the Guanzhong area main grain crops growth condition to monitor and to evaluate assets provides the theory basis.This article through the LI-1800 portable radiometer monitor winter wheat leaf spectrum changes in the four growth stage, studies in the different nitrogen and phosphate fertilizer condition the wheat agronomy parameter change and the wheat leaf spectrum characteristic between its correlational dependence, found the winter wheat nutrition monitor spectrum sensitive wave band; Use the ASD-Field field spectroscope mensurate l the summer corn's leaf surface spectrum index of reflection under the different nitrogen nutritional leve, the preliminary study under the different nitrogen level the corn leaf spectrum reflection characteristic between the leaf chlorophyll,and nitrogen content's correlational.Aim at the farm crop remote sensing monitor and assess produces the system to the request that the spectrum information obtain, developing as follows the research work of the aspect, and obtained the function to make progress.1. Carry on the related analysis between the winter wheat agriculture parameter, its purpose is that verifies winter wheat under the different nourishment level to experiment .The farmland soil nitrogen vegetable and wheat leaf's nitrogen content to present tossume the remarkable correlational dependence, the soil phosphorus element and the winter wheat leaf phosphorus content's relevance not to be remarkable later growth stage; The winter wheat leaf's nitrogen content and water content with the chlorophyll content relativities obvious, wheat leaf's contains the amount of phosphor to affect to the chlorophyll content not obviously.2. The winter wheat leaf index of reflection curve is tendency to be approximately same in the differently fertilizer level. the index of reflection is low in the visible light wave band(400-760). Between 500-600nm has a small absorption peak in the green light wave band; also has a high reflectance area in the near infrared area(760-1100nm). The winter wheat leaf's index of reflection in near-infrared (760-1100nm) along with the nitrogenous fertilizer the...