Relationships between grain yield and agronomic traits of rice in southern China

Abstract

Field experiments were conducted to evaluate the grain yield and agronomic traits of inbred and hybrid rice (Oryza sativa L.) 'Yuxiangyouzhan' and 'Shenliangyou 58 xiangyouzhan' at 11 different planting sites during 2013-2017 in Southern China. The grain yield, growth period, panicle number m-2 , productive tiller percentage, plant height, panicle length, grain number per panicle, filled grain number per panicle, filled grain percentage, and grain weight were evaluated. Results indicated that 'Shenliangyou 58 xiangyouzhan' produced higher grain yields than 'Yuxiangyouzhan' which was attributed to high grain weight and panicle length. Grain yield showed an increasing trend during 2013-2017 and the yield gaps among different years were attributed to differences in plant height, filled grain percentage and grain weight. The differences in grain yield among sites were mostly due to the combination effect of the agronomic traits which was greatly affected by the different climate conditions. The grain yield was significantly and positively correlated with the plant height, grain number m-2 , filled grain number per panicle, filled grain percentage and grain weight. Moreover, principal components analysis (PCA) suggested that grain number per panicle and filled grain number per panicle are critical parameters attributed to grain productivity. Therefore, flowering and post-flowering stage is the most critical in this regard to improve the grain number and filled grain number per panicle to get better yields in the agro-climatic conditions of southern China.

Splitting of Nitrogen Fertilizer and Planting Method Effects on Rice Productivity

“…The application of N as basal (B), Mid-tillering (MT), panicle initiation (PI) and late booting (LB) is necessary for optimum photosynthesis during growth stage to produce great number of filled grains as improve in sink size and capacity of rice. Similar results were obtained by Singh and Singh (1998); Luikhan et al, (2004) and Zhao et al, (2020). However there is no significant difference observed for 1000 grain weight under different split of nitrogen fertilizer.…”

“…Applying nitrogen fertilizer at an appropriate dose and time helps to enhance the photosynthetic activity of rice plants, improve resistance to pests, improve dry matter accumulation, promote better nutrient absorption, and thereby increase grain yield (Zhao et al, 2020).…”

Developing new lines of Japonica rice for higher quality and yield under arid conditions

“…The yield capability could be achieved by selecting the number of panicles per plant and the weight of the panicle characters. This may be due to the fact that the yield potential was mainly attributed to the number of grains per panicle and panicle weight (Zhao et al, 2020b). All these components caused heavy weight of panicles and high yielding ability as well as a greater number of panicles plant −1 .…”

Analyses of yield related agronomic traits of Malaysian rice varieties

“…Previously, a positive correlation of plant height and panicle length was also reported by Sohrabi et al (2012) and Lasalita-Zapico et al (2010) in upland rice, while Demewez et al (2014) reported a negative correlation between 1000grain weight to the days-to-50% heading and days-to-maturity, respectively. On the other hand, a positive correlation of plant height and yield among lowland rice was reported by Zhao et al (2020) whereas a negative correlation of days-tobooting and maturity with 1000-grain weight was recorded by Abraham et al (2017). A shorter vegetative growth may help to produce heavier grains, however this trait only contributes positively to the yield per plant of lowland rice varieties but not the yield of the upland rice varieties.…”