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Winter wheat and summer corn field trials in the North China Plain area Luancheng Experiment Station, winter wheat and summer corn canopy image using a digital camera, the combination of soil, plant rapid testing technology, digital image technology applied to winter wheat and summer corn nitrogen on the feasibility of the nutrition diagnosis, and digital image technology and soil, plants combined rapid test technology applied to winter wheat and summer corn nitrogen fertilizer recommended;, in Henan Fengqiu color of water and fertilizer coupling under winter wheat canopy parameter variation. The main findings are as follows: 1, the terrestrial digital image technology can be used as a diagnostic method of winter wheat and summer corn nitrogen nutrition. Winter wheat in the jointing stage and booting stage canopy of green standardized value G / (RGB) and soil, Plant Nitrogen test indicators showed a significant relationship. Canopy green standardized value G / terrestrial digital image processing the eight image color parameters (RGB) and nitrogen application rate, chlorophyll meter readings, the nitrate concentration of the stem base plant total nitrogen and jointing nitrogen supply the relationship of the amount of soil, plant nitrogen nutrition test indicators. Jointing stage digital image technology as a critical period of the winter wheat nitrogen nutrition diagnosis. 6-leaf stage of summer maize, maize canopy digital image color parameters of B / (RGB), G / B, R / B, B / L with nitrogen rate, SPAD value, nitrate concentration of plants, plant total N content, 0 ~ 90 cm soil nitrate content exists a significant linear correlation between B / (RGB) and nutritional parameters correlated best, followed by the B / L. The 6-leaf stage of summer maize nitrogen nutrition diagnosis critical period as the application of digital image technology, Blu-ray standardized value of B / (RGB) the the best canopy image color parameters of Summer Corn Nitrogen Nutrition Diagnosis. Terrestrial digital image acquisition, digital cameras and winter wheat canopy into 30 ~ 60 ° angle to shoot. Camera resultant the green normalized value and the camera itself, the pixel exists a certain relationship. 3, the application of terrestrial digital image technology and soil plant testing technology combined with Nitrogen Fertilizer recommended, according to the nitrate content of the jointing stage of winter wheat and green standardized value G / (RGB) equations recommended on winter wheat jointing stage, according to the equation fertilizer nitrogen supply is insufficient, the recommended amount of fertilizer for 100 1 50 kg (N) · hm -2 ; nitrogen supply to normal, the recommended amount of fertilizer 50 1 00kg (N) · hm -2 ; the nitrogen supply excess when 5 0kg (N) · hm -2 . Application of terrestrial digital image technology and soil plant testing technology combined with Summer Corn Nitrogen Recommendation, based on the the summer maize leaf nitrate content with Blu-ray standardized value of B / (RGB), established a recommended fertilization equation, according to this equation of summer corn leaf stage recommended fertilization. Insufficient nitrogen supply, the recommended amount of fertilizer for more than 230 kg (N) · hm -2 ; nitrogen supply to normal, the recommended amount of fertilizer for 180 2 30kg (N) The · hm -2 ; the nitrogen supply excess when 150 1 80kg (N) · hm -2 . Fertilizer coupling on the data of the resulting digital image color parameters for data analysis, found that the fertilizer coupling conditions, you can also use the digital image technology for winter wheat nutrition diagnosis. Digital image color parameters of nitrogen rate between there are very significant relationship. Fertilizer coupling conditions, the different moisture digital image color parameters between different, that is, with the changes in the amount of nitrogen, the color parameters under different water conditions certain regularity. Nitrogen rate is low, the positive role of water, nitrogen rate is high, the water is negative.
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