Abstract:
The comparative study on characteristics of dry matter production and nutrient uptake and utilization of japonica hybrid rice was conducted under super high yielding and high yielding conditions. The results showed that the dry matter weight per hill, total yield of dry matter per unit area, the accumulation amount of dry matter from heading to maturity stage and its ratio to total grain yield and the harvest index of super high yielding japonica hybrid rice were higher compared with high yielding rice. The amount of demand for N, P and K, especially the ratios of P and K requirement of super high yielding japonica hybrid rice plant were higher than those of high yielding rice. The allotment ratios of N, P and K in grain at maturity were high and that in leaf and sheath were low in super high yielding japonica hybrid rice compared with high yielding rice. The nutrient efficiency ratio, nutrient harvest index and nutrient use efficiency (NUE) were also higher than those of high yielding rice especially the NUE calculated in terms of grain yield was significant higher than that of high yielding rice.
CHEN Jin-hong,GUO Heng-de,MAO Guo-juan et al. Characteristics of Dry Matter Production and Nutrient Uptake and Utilization of Super High Yielding Japonica Hybrid Rice[J]. , 2001, 15(4): 271-275 .