Fruit production and SPAD index of pepper (Capsicum annuum L.) under nitrogen fertilizer doses

Costa, F. da S.; Lima, Antônio Suassuna de; Magalhães, Ivomberg Dourado; Chaves, Lúcia Helena Garófalo; Guerra, Hugo Orlando Carvallo

doi:10.21475/ajcs.18.12.01.pne453

Cited by 6 publications

(3 citation statements)

References 13 publications

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“…Leaf chlorophyll content has been commonly estimated base on SPAD value. This indirect and non-destructive approach has been proven to be accurate (Jiang et al, 2017;Ling et al, 2011;Coste et al, 2010;Mielke et al, 2010) and reliable (Agarwal and Gupta, 2018;Costa et al, 2018;Lin et al, 2018). In this study, SPAD value increased in Laris and Romario after being exposed to WSR and further increased during recovery period; but in contrast, SPAD value in Takanotsume decreased (Fig 3).…”

Section: Impacts On Leaf Gas Exchangessupporting

confidence: 50%

Morpho-physiological responses of chili peppers (Capsicum annuum) to short-term exposure of water-saturated rhizosphere

et al. 2019

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Chili pepper is frequently grown by local farmers at riparian wetland during dry season in Indonesia. However, during the last decade, unpredictable distribution and intensity of rainfall have increasingly threatened chili pepper production at the wetlands due to untimely water-saturated rhizosphere (WSR) occurrences. WSR is a condition when all pores within root zone were filled with water. This condition can be simulated by adding water into growing substrate until a thin layer of water was visible above substrate surface. Two Indonesian varieties (Laris and Romario) and one Japanese variety (Takanotsume) were used in this study. Aim of this study was to evaluate morpho-physiological effects of short-term (4 days) WSR exposure in chili pepper. Results of this study revealed that roots suffered more than aerial organs as indicated by the increase of shoot/root ratio from 4.56 at pre-exposure to 7.03 at end of the exposure. Total leaf area significantly reduced since larger older leaves were replaced by newly developed smaller leaves. Relative water content (RWC) in all organs was decreased, but did not reach a detrimental level. Leaf RWC was decreased from 83.6% at pre-exposure to 77.8% after the exposure; however, leaf RWC was able to rebound to 81.5% after 7 days of recovery. Photosynthetic and transpiration rates sharply decreased, associated with decrease in stomatal conductance during WSR exposure. Chlorophyll fluorescence also sharply declined. Gas exchange parameters did not significantly recover after 7 days of recovery in all varieties. Meanwhile, SPAD values were not affected by WSR exposure.

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Section: Impacts On Leaf Gas Exchangessupporting

confidence: 50%

Morpho-physiological responses of chili peppers (Capsicum annuum) to short-term exposure of water-saturated rhizosphere

et al. 2019

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“…Several studies have been carried out evaluating the efficiency of chlorophyll sensors, especially SPAD, in determining the N status of peppers (Godoy et al 2003;Madeira et al 2003;Madeira and Varennes 2005;Costa et al 2018;De Souza et al 2019). These measurements are usually made during some vegetative periods of the crop, and few studies have been considering the possible alterations of the index over the cycle.…”

Section: Introductionmentioning

confidence: 99%

Application of Proximal Optical Sensors to Assess Nitrogen Status and Yield of Bell Pepper Grown in Slab

Silva

Fontes

Milagres

et al. 2020

J Soil Sci Plant Nutr

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Nitrogen (N) is an essential element frequently associated with environmental issues, and the utilization of leaf clip sensors to adjust N fertilization is a technology of interest. This study aimed to evaluate the indices measured with SPAD and Dualex through the bell pepper crop cycle cultivated under different N doses, to identify the ability of the SPAD and Dualex optical sensors to assess N status and establishing the accuracy of the chlorophyll indices as yield estimators. Bell pepper plants were cultivated for 150 days after transplanting (DAT) in slabs fertigated with 6 different N doses divided into 10 biweekly applications. The indices SPAD, chlorophyll (CHL), flavonoids (FLV), and nitrogen balance index (NBI) were measured over the cycle on the uppermost mature leaves of each treatment. We determined the N content of these leaves and the final commercial yield. An interaction effect was found between N dose and growth stage. The SPAD and CHL indices were not significantly affected by N dose up to 60 DAT. The FLV and NBI indices show an opposite pattern in response to N dose. We found a strong correlation between the SPAD, CHL, and NBI and the N content in the leaves and between these indices and commercial yield in several evaluated dates. However, we did not observe a significant correlation between commercial yield and FLV. Both leaf clip sensors could predict the N status of the leaves and the commercial yield, improving the correlation as the crop development progressed.

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“…The SPAD values are related to the products of crops, and the cultivar-specific SPAD values can accurately estimate the final yields [17,18]. SPAD values of blueberry (V. darrowii) leaves were closely related to blueberry growth and dry matter accumulation [19].…”

Section: Discussionmentioning

confidence: 99%

SPAD Value Difference between Blueberry Cultivar ‘STAR’ by Planted Ground and Pot

Han¹,

Jung²,

Heo³

et al. 2022

Phyton

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In the smart farm, we can control every detail for production. Collecting every factor that affects the crop's final yield is necessary to optimize its efficiency. The SPAD values were observed in the 'Star' cultivar blueberry (Vaccinium darrowii) three times a day and at three different plant heights. The pattern of SPAD value change was different by the planting position. Ground planted blueberry (V. darrowii) represented a stable SPAD value during the day and at the different heights. However, the SPAD value was increased by time in pot-planted blueberry (V. darrowii). Also, the SPAD value of pot-planted blueberry was lower than ground planted blueberry (V. darrowii). Even when plants were of the same cultivar and age, planting conditions affected the changing pattern of SPAD in a day. Each planting condition had merit. Therefore, proper management is needed to compensate SPAD value in pot-planted blueberry (V. darrowii). This study suggests that environmental conditions like planting factors affect the final products. Therefore, to maximize the efficiency at the smart farm, the factors that could affect the final yield should be investigated and accumulated.

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Fruit production and SPAD index of pepper (Capsicum annuum L.) under nitrogen fertilizer doses

Cited by 6 publications

References 13 publications

Morpho-physiological responses of chili peppers (Capsicum annuum) to short-term exposure of water-saturated rhizosphere

Morpho-physiological responses of chili peppers (Capsicum annuum) to short-term exposure of water-saturated rhizosphere

Application of Proximal Optical Sensors to Assess Nitrogen Status and Yield of Bell Pepper Grown in Slab

SPAD Value Difference between Blueberry Cultivar ‘STAR’ by Planted Ground and Pot

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