Effects of nitrogen and potassium nutrition during late growth stage of rice on translocation of ~(14)C and grain yield

摘要

The effect of late N and K application on the translocation of ~(14)C from the flag leaf and on grain yield was studied. Four seedlings each of the hybrids W6154s/ DFO and W6154s/Tie-San-Ai (F_1) were transplanted into 15-liter pots. Fertilizer treatments were no fertilizer control, basal fertilizer only, basal fertilizer + topdressed N (urea) and K (K_2SO_5) at 5-7 d before panicle exsertion, and basal fertilizer + topdressed N (urea) and K (K_2SO_4) at 5-7 d after panicle exsertion. Basal fertilizer consisted of 2 g each of urea, calcium superphosphate, and potassium sulfale/pot.