Reasonable Nitrogen Regime in the Main Crop Increased Grain Yields in Both Main and Ratoon Rice

Planting ratoon rice can realize one sowing and two harvests, which is of great significance for improving grain yield. However, the effects nitrogen (N) regime in main crop on yield associated physiological mechanisms are not clearly understood. The indica hybrid Liangyou 6326 was used, three N fertilizer levels (100 kg ha?1 (low N, LN), 250 (medium MN), 400 (high HN)) four different ratios basal tillering to panicle (7:3, 6:4, 5:5, 4:6) applied were designed investigate their yields crops. results showed that excessive application rate conducive improvement agronomic use efficiency (ANUE) both seasons. increased attributed increase regeneration rate. Appropriate increasing beneficial ROA NSC concentration crop, resulting an number, length, fresh weight regenerated buds, caused when germination buds decreased length bud resulted a decrease These suggest production rice, reasonable could ANUE