Abstract: The field experiment was conducted to investigate the effects of controlled-release fertilizers (including one kind of fertilizer enveloped by colophony, CRF, and the other kind of fertilizer enveloped by sulfur, SCF) on accumulation and distribution of photosynthate and nitrogen as well as yield after anthesis of summer maize. Results indicated that photosynthetic rate of the treatments with controlled-release fertilizers CRF and SCF kept in a higher level after anthesis. Under the same application rates of N, P, and K, applying CRF (1 428 kg ha^-1) and SCF (1 668 kg ha^-1) increased the accumulation of dry matter and nitrogen per plant significantly compared with applying the common compound fertilizer (CCF, 1 260 kg ha^-1). When the applied amounts of the CRF and SCF were decreased by 25%, the increment was also significant, and the distribution proportion of the dry matter from plant to seeds was significantly higher than that of applying CCF. The accumulation of the nitrogen in seeds of the CRF and SCF treatments was significantly higher than that of CCF treatment at maturity stage, and was increased with increasing applied proportion of fertilizer, but these was no significant difference between treatments of CRF, SCF and 25%.of CRF and SCF. Appling CRF and SCF increased the maize grain yield by 13.15% and 14.15% respectively under the same application rates. When the applied amount of CRF and SCF was decreased by 25%, the yield increment was 9.69% and 10.04%, respectively, the nitrogen use efficiency (NUE) and nitrogen agronomy efficiency were significantly higher than those of applying CCF.

Key words: Summer maize, Controlled-release fertilzer, Accumulation and distribution of dry matter, Accumulation and distribution of nitrogen, Yield