The genotypic difference of potassium nutrition of flue-cured tobacco Difference and Its Mechanism in Tolerance to Low-Potassium between Liaomian 18 and NuCOTN99B at Seedling Stage N,P,K uptake by winter wheat and maize as influence by different combinations of irrigation water and nitrogen fertilizer Effect of organic microbe fertilizer application on watermelon growth and soil microorganisms under continuous mono-cropping Systemic Feedback Regulation of K+ Uptake in Cotton at Seedling Stage Effects of long-term fertilization on potassium uptake of summer maize and potassium dynamics of fluvo-aquic soil Effects of partial root-zone irrigation and N,K levels on dry mass accumulation, water and nutrients use of maize