An application of digital imagery analysis to understand the effect of N application on light interception, radiation use efficiency, and grain yield of maize under various agro-environments in Northern Mozambique

Tsujimoto, Yasuhiro; Pedro, Joao Antonio; Boina, Guilhermino; Murracama, Miguel V.; Tobita, Satoshi; Oya, Tetsuji; Nakamura, Satoshi; Cuambe, Constantino; Martinho, Carolino

doi:10.1080/1343943x.2016.1240013

Cited by 6 publications

(5 citation statements)

References 26 publications

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“…In addition, increasing 120 kg N ha -1 significantly enhanced the light interception rate of population within the amount of N application in this experiment. These results were similar to those of Tsujimoto et al. (2017) who also proved that suitable N application methods could obviously improve crop population development and increase both radiation use efficiency and light interception.…”

Section: Discussionsupporting

confidence: 88%

“…The measurement locations were chosen randomly, and 10 replications were performed for each plot. LI (light interception rate) was calculated using the following formula ( Xue et al., 2015 ; Tsujimoto et al., 2017 ): LI = (1-Io/lt)×100%, where LI is the percentage of light that is intercepted, and Io and It are the PAR of wheat population at top and bottom, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Optimized N application improves N absorption, population dynamics, and ear fruiting traits of wheat

Zhang,

Xu,

et al. 2023

Front. Plant Sci.

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Optimizing the N application amount and topdressing ratio can increase crop yield and decrease N loss, but its internal mechanisms have not been well studied, especially from the aspects of population dynamics and structure, ear fruiting traits. Here, field experiments, with three N rates 120 (N1), 180 (N2), and 240 (N3) kg N ha-1 and three N topdressing ratios T1 (7:3), T2 (6:4), and T3 (5:5) were conducted. At the same N level, results showed that the N accumulation amounts in the leaf, grain, and plant in T2 were higher than in T3 and T1, and increasing 60 kg N ha-1 (N3 compared to N2, N2 compared to N1) significantly enhanced N accumulation amounts. The effect of the N topdressing ratio on partial factor productivity of applied N was consistently T2 > T3 > T1, but T1 was more conducive to improving N utilization efficiency for grain and biomass production. After the jointing stage, compared to T1 and T3, T2 was more conducive to increasing the population growth rate of plant height, leaf area index, leaf area growth rate, dry matter weight, dry matter accumulation rate, light interception rate, and spikelets of population, and the above-mentioned indexes of population could be significantly enhanced by increasing 120 kg N ha-1. T2 increased the fruiting spikelets per ear, grains per ear, grain weight per ear, fruiting rate per ear, grain filling rate per ear, and yield but decreased the sterile spikelets at the top and bottom and imperfect grains per ear. Increasing N from 120 kg ha-1 to 180 kg ha-1 or from 180 kg ha-1 to 240 kg ha-1 significantly enhanced yield. The N accumulation amount in the grain, leaf, plant, leaf area growth rate, dry matter accumulation rate, light interception rate, population spikelets, fruiting spikelets per ear, grain filling rate, and yield were significantly positively correlated with each other. This study demonstrates a suitable N application rate with a N topdressing ratio 6:4 would more effectively improve N efficiency, population dynamics, structure, ear fruiting traits, and yield, but the effect of the N topdressing ratio is not as significant as that of increasing 60 kg N ha-1.

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Section: Discussionsupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Optimized N application improves N absorption, population dynamics, and ear fruiting traits of wheat

Zhang,

Xu,

et al. 2023

Front. Plant Sci.

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“…The orthorectified pictures were then cut out from each plot, and ImageJ version 1.52 g [23], used to perform the calculation of fractional green areas of the pictures of each plot. Consequently, canopy coverage was calculated by digital imagery analysis [24].…”

Section: Plant Growth Monitoringmentioning

confidence: 99%

The Contribution of Root Turnover on Biological Nitrification Inhibition and Its Impact on the Ammonia-Oxidizing Archaea under Brachiaria Cultivations

et al. 2020

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Aims: Biological nitrification inhibition (BNI) has been reported as an emerging technology to control soil nitrifier activity for effective N-utilization in cropping systems. Brachiaria have been reported to suppress nitrifier populations by releasing nitrification inhibitors from roots through exudation. Substantial BNI activity has been reported to be present in the root tissues of Brachiaria grasses; however, BNI contribution, such as root turnover, has not been addressed in previous studies. The present study aimed to clarify the contribution of root turnover on BNI under Brachiaria cultivations and its impact on nitrifier populations. Methods: We monitored root growth, changes in ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) numbers, nitrification rate, and available nitrogen (N) content under seven germplasm lines of Brachiaria, for 18 months with seasonal profile sampling. Results: Brachiaria cultivation increased soil NH4+-N, available N, and total soil carbon levels. Though we did not find any correlation between the changes in AOB populations and potential nitrification, the potential nitrification rate decreased when AOA populations decreased. Multiple regression analysis indicated that BNI substances from root tissue turnover had a significant contribution to the BNI function in the field. Conclusion Results indicated that the inhibitory effect of BNI was mostly evident in AOA, and not in AOB, in this study. Brachiaria cvs. ‘Marandu’, ‘Mulato’, and ‘Tupy’ had the most substantial BNI effect among the seven cultivars evaluated. The estimated total BNI activities and available N content of root tissue explained the observed nitrification inhibition. In conclusion, the release of BNI substances through plant decomposition contributes to the decrease in the abundance of AOA, and thus the inhibition of nitrification under Brachiaria cultivation.

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“…Tiller number, leaf age or the number of leaves on the main stem (LN), leaf width of the open-top leaf, and projected green leaf area (PLA) in each pot were observed weekly from 19 days after transplanting (DAT). PLA was estimated using digital imagery analysis according to the method of Tsujimoto et al (2016). Briefly, each pot was sequentially put into a 1.6 m-height carton box with a small lens hole on the top and one side open (the opposite side of the side illuminated by sun's rays) to avoid reflectance from direct sunlight, and then a digital photograph was taken virtually from the lens hole.…”

Section: Measurementsmentioning

confidence: 99%

AZ-97 (Oryza sativa ssp. Indica) exhibits superior biomass production by maintaining the tiller numbers, leaf width, and leaf elongation rate under phosphorus deficiency

Tsujimoto

Sakata

Raharinivo

et al. 2020

Plant Production Science

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Shoot morphology in rice plants changes in response to P deficiency. However, how genotypic variations in these morphological changes affect the canopy development and biomass production have hardly been explored. The study aimed to identify specific shoot morphological traits that confer biomass production under P deficiency. Four rice genotypes, including AZ-97 (WAS 63-22-5-9-10-1), which exhibits high performance under highly P-deficient fields in Madagascar, were grown for 56 days in flooded pots over several P application rates to simulate P-sufficient and moderately, severely, and extremely P-deficient conditions. AZ-97 had superior shoot P contents and biomass than Takanari, a high-yielding cultivar, and X265, a common high-yielding cultivar in Madagascar at severely to moderately P-deficient conditions. Shoot biomass was highly correlated with projected leaf area (PLA) from the early growth stage, and tiller number, leaf width, and leaf elongation rate explained the variations in PLA. These morphological traits reduced significantly with decreased P application rates, while reduction in AZ-97 was small relative to the other genotypes, even for equivalent shoot P contents. As the result, AZ-97 had greater PLA per unit of shoot P content at equivalent shoot P contents. The result indicates that lower sensitivity and degrees of change in shoot morphology when exposed to P deficiency stress could be a key trait facilitating the maintenance of captured radiation and subsequently influencing genotypic differences in external P uptakes and biomass production. AZ-97 is a potential donor with such traits that can offer an additional avenue for genetic improvement toward P-efficient rice production.

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An application of digital imagery analysis to understand the effect of N application on light interception, radiation use efficiency, and grain yield of maize under various agro-environments in Northern Mozambique

Abstract: (2017) An application of digital imagery analysis to understand the effect of N application on light interception, radiation use efficiency, and grain yield of maize under various agro-environments in Northern Mozambique,

Cited by 6 publications

References 26 publications

Optimized N application improves N absorption, population dynamics, and ear fruiting traits of wheat

Optimized N application improves N absorption, population dynamics, and ear fruiting traits of wheat

The Contribution of Root Turnover on Biological Nitrification Inhibition and Its Impact on the Ammonia-Oxidizing Archaea under Brachiaria Cultivations

AZ-97 (Oryza sativa ssp. Indica) exhibits superior biomass production by maintaining the tiller numbers, leaf width, and leaf elongation rate under phosphorus deficiency

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