Growth of broadcasted rice and compensatory effect on yield at different seedling densities.

摘要

A field trial was conducted to analyse the growth characteristics and compensatory effect on the yield of rice cv. Yamahikari broadcast in submerged soil at four seedling densities (32, 64, 96, 160/m2). The relative tillering rate (RTR) and relativegrowth rate (RGR) were greater in higher density plots (96, 160/m2) during early growth and greater at lower seedling densities during subsequent growth. Differences in RGR were mainly attributed to leaf area ratio (LAR) in the early growth stage and net assimilation rate (NAR) in subsequent stages. There was no significant difference in yield per m2 among seedling densities. The lower density plots (32, 64/m2) showed high RTR through high NAR in the middle and late growth stages, and the panicle number per plant and spikelet number per panicle were greater at lower seedling densities to compensate for lower number of panicles/m2.