Study on cotton nitrogen diagnosis with reflectance meter Soil testing and fertilizer recommendations in China during the past decade Nitrogen recommendation of cauliflower based on different soil Nmin target values Variability of soil nutrients in field and fertilizer recommendation USING ORTHOGONAL TREND ANALYSIS TO DEVELOP THE LARGE AREA ECONOMIC FERTILIZATION MODELS Approach and decision support system based on crop yield response and agronomic efficiency Study on index of fertilizer recommendation for spring wheat in Hetao irrigated area Application of 3414 field trial design for establishing soil testing and fertilizer recommendation index A review on chlorophyll meter application on nitrogen fertilizer recommendation Research of nitrogen nutrition status for winter wheat based on chlorophyll meter Study on parameters of balanced fertilization for winter wheat in cinnamon soil in Northern China