Ratio of base and topdressing
Ratio of base N to dress N
Ratio of N and P fertilizers
application of N and water
Combined application of N and K
combined application of N and Zn
mixture application of N and P fertilizer
application ratio of NPK fertilizer
determinator of ratio of specific heat of gas
different ratio of N∶P∶K
Invariability of Ratio of Areas
N ratio of split application
Ratio of base to topdressing fertilizer
Service life and ratio of material utilization
the number and ratio of bolls