Cotton plant nitrogen diagnosis and nitrogen fertilizer recommendation adapting nitrate concentration in the 4th(expanding) petiole as index was studied under field conditions.

Based on field fertilizer experiment of cotton under drip irrigation in the area,cotton nitrogen diagnosis and nitrogen fertilizer recommendation with soil inorganic nitrogen quick test was st.

Use the SPAD-502 chlorophyll meter to rapid,on-farm analysis crop chlorophyll status and nitrogen fertilizer recommendation.

It (explored) knowledge representation of describing (knowledge), multimedia (knowledge), conjunction (knowledge) and calculating (knowledge) in recommended fertilization.

In the practice of intelligent management system development for corn procduction, recommended fertilization model for corn in karst area of Guizhou Province was explored, the major factors to ought to be considered in recommended (fertilization) were put forward and its model parameters were also selected and datermined.

Using Monte Carlo method for parameter estimation and fertilization recommendation of multivariate fertilizer response model

In 1980s, the studies on the fertilizer recommendation based on soil testing are greatly developed; fertilization recommendation index was established initially.

Chlorophyll meter,a portable instrument,was often used in N nutritional diagnosis and fertilization recommendation in recent years.

Design and application of the information system of soil recommendation fertilization;