Differential responses of system of rice intensification (SRI) and conventional flooded-rice management methods to applications of nitrogen fertilizer

Farmer adaptation of intermittent flooding using multiple-inlet rice irrigation in Mississippi

“…That rice yields under an intermittent-flood regime would be equal to or greater than the corresponding yields for continuousflood treatments was not expected based on literature reports (Wang et al, 1998;Bronson et al, 1997;Phillips, 1999). However, when urea was applied in single pre-flood applications to drillseeded rice on clay soils, our results did not indicate significant nitrogen losses and/or the losses were more than offset by other beneficial processes, such as by increased root growth (Ye et al, 2012), improved nutrient acquisition and tillering (Mishra, 2012), and/or other physiological processes (Zhang et al, 2009;Liu et al, 2013) that improve grain yield (Thakur et al, 2013). Because only rough rice yields were measured in this study, we can only speculate as to the actual cause(s) for the observed yield increases.…”

Yield and Yield Attributes Influenced by Different Planting Methods and Nitrogen Treatments

“…This positively improved the grain filling percentage in SRI. These results could be substantiated by the findings of Thakur et al, (2013). Application of nitrogen through N 5 treatment recorded significantly higher percentage of grain filling over other nitrogen treatments during both the years of study.…”

“…The higher availability of nitrogen in 75 % inorganic and 25 % organic (N 5 ) treatment results in higher grain yields as higher availability of nitrogen influenced the synthesis of chlorophyll molecule, lead to proportional increases Photosynthetic rate activity and photosynthetic assimilates. These conditions improve the effective tillers, test weight of grains, filled grain percentage, and finally improve the grain yield (Thakur et al, 2013). Straw yield of rice was significantly higher in SRI (7495 and 7180 kg ha -1 ) than NTP (6830 and 6505 kg ha -1 ) during 2015 and 2016, respectively.…”

Effect of poly (γ-glutamic acid) on wheat productivity, nitrogen use efficiency and soil microbes

“…To meet the recent growing demand for food, investments on agriculture are increasing. Consequently, synthetic fertilizer application is also increasing (Thakur et al, 2013). Globally, fertilizer nitrogen (N) application has increased rapidly over the past several decades, from 32 million tons in 1970 to around about 100 million tons in 2010; it is expected to increase to 130-150 million tons/year by 2050 (Matson et al, 1998).…”