关键词: 肥水管理, 直播稻, 产量, 群体质量

Abstract: Field experiments were carried out to study the effects of two kinds of fertilizer and water management mode on yield formation and population quality in direct-sowing rice, using Wuyunjing 23 as material. The results showed that: （1） On the basis of access to appropriate panicle number, the grain number per panicle and grain weight increased under optimized management of fertilizer and water. The average yield achieve 619.5 kg/667 m2 by optimized management, increasing 44.5 kg/667 m2 and 7.74 percent compared with the conventional management of fertilizer and water. （2） Through reasonable management of water and fertilizer, optimized management controls the occurrence of low tiller on main stem, boosts median tiller becoming panicle, reduces the peak seedlings, improves the spike rate, promotes strong stalk and big spike, increases dry matter accumulation after heading, and significantly increases the yield of direct-sowing rice.

Key words: fertilizer and water management, direct-sowing rice, yield, population quality