Dear Doctors.

I want papers to see the combined effect of NPK levels on rice specially in hydroponic solution, If you have any paper regarding this please send me.

OR

What levels for NPK you would recommend me to start my experiment? The Normal N, P and K concentration will be our control, other levels you can suggest me which could be in both deficient and sufficient levels of N,P and K, which I prefer in my experiment.

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