Midseason Nitrogen Fertilization Rate Decision Tool for Rice Using Remote Sensing Technology

摘要

In drill-seeded, delayed flood rice production in the mid-southern United States, N fertilizer is most commonly applied using a two-way split application. The second application occurs at midseason near the panicle initiation stage of rice development where approximately one-third of the estimated N fertilizer requirement is applied. Midseason N rates are often adjusted either up or down by rice producers or crop consultants by visual assessment of the rice. In rice cropping systems such as these, instruments which could make in-season estimates of yield potential and available soil N would provide the initial framework to predict midseason N needs and greatly improve N fertilizer use efficiency in rice