Comparisons In The Grain Yield And Quality, Morphology And Physiology Between Upland And Paddy Rice

Elucidation of effects of soil moisture, planting methods and nitrogen (N) levels on upland and paddy rice and putting forward reasonable cultivation approaches would have great significance in the production for water-saving, high grain yield, good grain quality and high efficiency. In this study, soil culture, pot and field experiments were conducted with typical upland rice and paddy rice cultivars as materials, and treatments of different soil water potentials (SWP), cultivation methods and N levels were designed, and the comparisons in the grain yield and quality, morphology and physiology between upland and paddy rice were studied. The main results are as follows:1. Characteristics of grain yield formation of upland and paddy rice under different treatments Under different levels of N and SWP, upland rice showed a higher grain yield, more spikelets per panicle and higher percentage of ripened grains and 103-grain weight, and weaker ability of productive tillers and fewer panicles than paddy rice. With the decrease in SWP, the grain yield, spikelets per panicle, ripened grains and 103-grain weight were all reduced for both upland and paddy rice. Compared with that under the moist cultivation (MC, control), the grain yield was significantly lower under plastic film mulching cultivation (PFMC) for upland rice, whereas there was no significant difference in grain yield between PFMC and MC for paddy rice. Among the three cultivation methods of MC, PFMC and...