Nitrogen Strategy and Seeding Rate Affect Rice Lodging, Yield, and Economic Returns in the Midsouthern United States

Corbin, Jennifer L.; Orlowski, John M.; Harrell, Dustin L.; Golden, Bobby R.; Falconer, Lawrence L.; Krutz, L. Jason; Gore, Jeffrey; Cox, Michael S.; Walker, T. W.

doi:10.2134/agronj2016.03.0128

Cited by 20 publications

(9 citation statements)

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“…When averaged across TE rates and timings 100% of N applied at V3 resulted in 4% (12,083 vs. 11,542 kg ha -1 ) greater grain yield than the split application strategy. Multiple studies evaluating modern rice cultivars have reported increased grain yield when all N fertilizer is applied preflood compared to split applications (Bollich et al, 1994, Norman et al, 2000Slaton et al, 2003;Bond et al, 2008;Corbin et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Trinexapac‐Ethyl and Nitrogen Management to Minimize Lodging in Rice

et al. 2016

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Rice (Oryza sativa L.) is an important crop in the midsouthern United States. However, some high‐yielding cultivars are highly susceptible to lodging. The plant growth regulator, trinexapac‐ethyl (TE), has been shown to decrease lodging in upland cereal crops, but data are scarce that demonstrate rice response to TE. The objective of this study was to determine the effect of TE on rice plant height, lodging, and grain yield. Experiments were established at multiple locations during the 2012 and 2013 growing seasons in Mississippi. Trinexapac‐ethyl was applied to a lodging‐susceptible rice cultivar at 12, 24, and 48 g a.i. ha−1 at two timings: panicle differentiation (R1) and R1 + 14 d. Rice response to TE was determined for rice that received 100% of N applied at V3 and rice that received a two‐way split N strategy (75% N at V3 and 25% at R1). On both clay and silt‐loam soils all rates of TE reduced plant height and lodging compared to nontreated rice. The effect of TE on rice grain yield was variable. On silt‐loam soils 12 g a.i. ha−1 TE resulted in rice grain yield similar to nontreated rice when applied at R1, but decreased grain yield when applied to rice at R1+ 14 d. The 48 kg a.i. ha−1 rate decreased rice grain yield on both soil textures. The results of this study indicate that trinexapac‐ethyl may be a useful tool to manage lodging, but further research is needed refine TE use guidelines in rice. Trinexapac‐ethyl decreased rice plant height and lodging on both clay and silt loam soils. Trinexapac‐ethyl at 12 g a.i. ha−1 did not decrease grain yield when applied at panicle differentiation on silt loam soils. Grain yield response to trinexapac‐ethyl varied by soil texture and N management strategy.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Trinexapac‐Ethyl and Nitrogen Management to Minimize Lodging in Rice

et al. 2016

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“…NRI and NBI at the late filling stage can thus be used to better predict grain yield. However, rice yield could change as a result of the interaction of complex factors [29, 30], such as unusual precipitation and temperature, which can cause rice lodging and disease [31–33]. Therefore, actual rice yield may differ from the yield predicted by NRI and NBI at the late filling stage, so these predictions should be used cautiously.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of grain yield based on digital images of rice canopy

Liu

Han

et al. 2019

Plant Methods

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BackgroundRice canopy changes are associated with changes in the red light (R), green light (G), and blue light (B) value parameters of digital images. To rapidly diagnose the responses of rice to nitrogen (N) fertilizer application and planting density, a simple model based on digital images was developed for predicting and evaluating rice yield.ResultsN application rate and planting density had significant effects on rice yield. Rice yield first increased and then decreased with increasing of N rates, while the rice yield always increased significantly with increasing planting density. The normalized redness intensity (NRI), normalized greenness intensity (NGI), and normalized blueness intensity (NBI) values of the rice canopy varied among stages; however, they were primarily affected by N fertilizer rates, while planting density had no significant effects. Furthermore, the significant relationships of grain yield with NRI and NBI at the late filling stage could be fitted by quadratic equations, but there was no significant relationship observed between grain yield and NGI across all stages. In addition, a field validation experiment showed that the predicted yield based on the fitted quadratic equations was consistent with the measured yield.ConclusionThe NRI, NGI, and NBI values of rice canopy were mainly affected by N fertilizer rates, while the planting density had no significant effect. The significant relationships between grain yield with NRI and NBI at the late filling stage could be fitted by quadratic equations. Therefore, the canopy NRI and NBI at the late filling stage as measured by digital photography could be used to predict grain yield in southern China.Electronic supplementary materialThe online version of this article (10.1186/s13007-019-0416-x) contains supplementary material, which is available to authorized users.

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“…Moreover, N application at panicle initiation stage of rice increases grain yield by increasing grain weight in inferior spikelets (19). However, application of N at late vegetative stage delays maturity and increases chances of lodging (20). Therefore, field optimisation of rate and exact time of N application must to studied for economic yield returns along with quality grains.…”

Section: Discussionmentioning

confidence: 99%

Combined zinc and nitrogen applications at panicle initiation for zinc biofortification in rice

et al. 2019

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Background and purpose: Increasing zinc (Zn) concentration in rice grains can help improve Zn nutrition of people. The combinations of Zn and nitrogen (N) applications at panicle initiation were investigated for Zn biofortification in rice. Materials and methods: Rice (cv. Super Basmati) seedling were grown in pots having a calcareous soil. All combinations of four Zn (control, Soil 6 mg Zn kg-1 , foliar 2 × 0.2% Zn and soil + foliar Zn) and three N (control, soil 20 mg N kg-1 and foliar 0.5% N) levels were imposed at panicle initiation. At maturity, grains analysed for Zn and proteins. Results: Grain protein concentration was significantly increased with foliar Zn treatments, and with soil and foliar N. Maximum grain Zn concertation (30 mg kg-1) was achieved with application of soil Zn + foliar Zn + foliar N. At each N level, Zn application by either method significantly increased grain Zn concentration over control. This increase in grain Zn concertation at N levels was 36 to 54% with soil Zn + foliar Zn, 27 to 45% with foliar Zn and 9 to 15% with soil Zn over its control level. Conclusions: Grain Zn concentration was significantly increased with soil N when combined with soil Zn, and with foliar N when combined with foliar Zn treatments. Conclusively, foliar N combined with soil + foliar Zn is the best combination of late Zn and N application for agronomic Zn biofortification in rice.

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Nitrogen Strategy and Seeding Rate Affect Rice Lodging, Yield, and Economic Returns in the Midsouthern United States

Abstract: core ideas• Split N application in rice limits lodging but also reduce grain yield.• High N rates and seeding rates increase lodging and harvest costs.• Appropriate early-season (prefl ood) N is necessary to maximize rice grain yield.

Cited by 20 publications

References 25 publications

Evaluation of Trinexapac‐Ethyl and Nitrogen Management to Minimize Lodging in Rice

Evaluation of Trinexapac‐Ethyl and Nitrogen Management to Minimize Lodging in Rice

Evaluation of grain yield based on digital images of rice canopy

Combined zinc and nitrogen applications at panicle initiation for zinc biofortification in rice

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