Ecophysiological Analysis on Effect of Planting Pattern on Biomass Production and Grain Yield in Rice

Abstract

Increasing the biomass productivity of rice is a critical research target for improving the yield potential. This paper reviews ecophysiological studies on biomass production as affected by agronomic techniques and cultivars. In addition, we examined the effects of the planting pattern on the biomass production using cv. Takanari, a high-yielding and lodging resistant cultivar. The results showed that greater biomass production and grain yield were observed in plants with the combination of one plant per hill, high hill density and square hill arrangement. The factors responsible for high biomass production in this combination are; (1) vigorous tiller increase at the tillering stage resulting in higher capture of solar radiation, (2) erect leaves in the canopy after the panicle formation stage resulting in an improved light-intercepting character or smaller extinction coefficient, and (3) larger nitrogen accumulation during the ripening period resulting in a smaller decline of photosynthesis as well as a smaller midday and afternoon depression of photosynthesis possibly related to the larger water uptake ability of roots owing to better root-system development. Our results implied that an improvement in biomass production and yield is possible by optimizing the planting pattern and nitrogen management using high-yielding and lodging resistant cultivars in transplanted and direct-sown rice.

Evaluation of Indigenous and High Yielding Rice Varieties for Growing in Tidal Floodplain Ecosystem of Southern Bangladesh

“…Two indigenous varieties Moulata and Lalmota had identical but significantly larger number of tillers per m 2 compared with two HYVs and one indigenous variety Sadamota. Rice grain yield is positively and linearly related with the number of tillers per unit area [9,10]. Wang et al [11] suggested selection of genotypes with tillering capacity for obtaining higher yield in rice.…”

Effect of Dense Planting of Hybrid Rice on Grain Yield and Solar Radiation Use in Southeastern China

“…Huang et al (2018) investigated machine‐transplanted double cropping rice and found that increasing hill density can compensate for yield loss from reduced N input. An increase in crop yield under dense planting was reported as a consequence of the rise in biomass (Katsura et al, 2010; San‐Oh et al, 2008), which might be attributed to the greater potential capacity of the crop canopy to capture solar radiation, water, and nutrients in the deep soil layer (Dingkuhn et al, 2015; Du et al, 2015). For example, increased leaf area index (LAI) and an effective blade spatial arrangement ensure that plant photosynthesis meets the needs of high yield (Yoshida, 1981).…”

Inclination Angle Affects Ozone Injury in the Flag Leaf of Rice

“…Thus, we conclude that the leaf inclination angle is a major determinant of the O 3 inhibition in our case. In paddy field conditions, however, individual rice plants are affected by mutual shading during growth and receive considerably different incident light within the canopy (San-oh et al, 2008). Furthermore, the profile of canopy O 3 concentration may be complex.…”