Use of Chlorophyll Meter Sufficiency Indices for Nitrogen Management of Irrigated Rice in Asia

Hussain, Fiaz; Bronson, K. F.; Yadvinder‐Singh,; Bijay‐Singh,; Peng, Shaobing

doi:10.2134/agronj2000.925875x

Cited by 143 publications

(18 citation statements)

References 17 publications

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“…Chlorophyll fluorescence emission was measured from the adaxial surface of second-fully expanded leaf at the vegetative stage or flag leaf at the reproductive stage using a fluorescence monitoring system (model FMS 2; Hansatech Instruments Ltd., Norfolk, United Kingdom) according to Loggini et al (1999) and Maxwell and Johnson (2000) . Leaf greenness was measured using SPAD (SPAD-520Plus, Konica Minolta, Osaka Japan) at the same leaf position ( Hussain et al, 2000 ). LBS was visually scored on a scale of 1 (no symptom on leaf) to 9 (dead leaf) according to the IRRI Standard Evaluation System for rice ( SES, 2013 ; Supplementary Figure S2 ).…”

Section: Methodsmentioning

confidence: 99%

Determination of traits responding to iron toxicity stress at different stages and genome-wide association analysis for iron toxicity tolerance in rice (Oryza sativa L.)

Theerawitaya

Wanchana²,

Ruanjaichon³

et al. 2022

Front. Plant Sci.

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Rice is the staple food for more than half of the world’s population. Iron toxicity limits rice production in several regions of the world. Breeding Fe-tolerant rice varieties is an excellent approach to address the problem of Fe toxicity. Rice responds differently to Fe toxicity at different stages. Most QTLs associated with Fe toxicity have been identified at the seedling stage, and there are very few studies on Fe toxicity across different stages. In this study, we investigated agro-morphological and physiological traits in response to Fe toxicity in a rice diversity panel at seedling, vegetative, and reproductive stages and applied GWAS to identify QTLs/genes associated with these traits. Among agro-morphological and physiological parameters, leaf bronzing score (LBS) is a key parameter for determining Fe toxicity response at all stages, and SDW could be a promising parameter at the seedling stage. A total of 29 QTLs were identified on ten chromosomes. Among them, three colocalized QTLs were identified on chromosome 5, 6, and 11. Several QTLs identified in this study overlapped with previously identified QTLs from bi-parental QTL mapping and association mapping. Two genes previously reported to be associated with iron homeostasis were identified, i.e., LOC_Os01g72370 (OsIRO2, OsbHLH056) and LOC_Os04g38570 (OsABCB14). In addition, based on gene-based haplotype analysis, LOC_Os05g16670 was identified as a candidate gene for the colocalized QTL on chromosome 5 and LOC_Os11g18320 was identified as a candidate gene for the colocalized QTL on chromosome 11. The QTLs and candidate genes identified in this study could be useful for rice breeding programs for Fe toxicity tolerance.

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Section: Methodsmentioning

confidence: 99%

Determination of traits responding to iron toxicity stress at different stages and genome-wide association analysis for iron toxicity tolerance in rice (Oryza sativa L.)

Theerawitaya

Wanchana²,

Ruanjaichon³

et al. 2022

Front. Plant Sci.

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“…This is particularly important for N, as the losses are relatively high but can only be reduced with higher labour requirements. Leaf-colour charts or chlorophyll meters are helpful in this, as it can determine the time and rate at which N fertiliser application is required to maximise the use efficiency, based on the depletion of leaf greenness (Hussain et al, 2000;Singh et al, 2002;Alam et al, 2005;Gupta & Seth, 2007;Nhamo et al, 2014). Experiments conducted in the Philippines revealed that the N fertiliser rate could be reduced by 30-45% without affecting the grain yield of rice when N is applied based on the leaf colour chart compared with the conventional practice (Hussain et al, 2000).…”

Section: In-season Nutrient Managementmentioning

confidence: 99%

“…Leaf-colour charts or chlorophyll meters are helpful in this, as it can determine the time and rate at which N fertiliser application is required to maximise the use efficiency, based on the depletion of leaf greenness (Hussain et al, 2000;Singh et al, 2002;Alam et al, 2005;Gupta & Seth, 2007;Nhamo et al, 2014). Experiments conducted in the Philippines revealed that the N fertiliser rate could be reduced by 30-45% without affecting the grain yield of rice when N is applied based on the leaf colour chart compared with the conventional practice (Hussain et al, 2000). In Bangladesh, N application based on the leaf colour chart increased the grain yield by 0.1-0.7 t ha −1 compared with farmer's management (Alam et al, 2005).…”

Section: In-season Nutrient Managementmentioning

confidence: 99%

Rice production in nutrient-limited soils: Strategies for improving crop productivity and land sustainability

Suriyagoda¹

2022

J. Natn. Sci. Foundation Sri Lanka

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Productivity improvement of rice cultivation in most parts of Africa and Asia has slowed down, which is largely due to declining soil fertility. Widely reported soil fertility constraints are deficiencies of nitrogen (N), available phosphorus (P), sulphur (S) and zinc (Zn). The amount of N, P and potassium (K) removed with the harvest of 5 t grain ha −1 is estimated as 27-97 kg N ha −1 , 4-20 kg P ha −1 , and 8-32 kg K ha −1 . Straw produced from one ha of land also contains 25-40 kg N, 3.5-10.5 kg P, 70-85 kg K, 2.5-5 kg S, 15-20 kg Ca, 5-15 kg Mg and 200-350 kg Si. Soils do not have an inherent capacity to replenish these amounts of nutrients over the very short period. Most rice farmers also do not have the ability to apply nutrients due to financial limitations and/or lack of awareness. In order to sustain rice cultivation in those fields, soil fertility constraints must be addressed without prioritising unrealistic synthetic fertiliser applications. Improving soil organic carbon and nutrient pools by incorporating organic manure is needed. Crop rotation, including fallow, minimal or zero tillage, sitespecific nutrient management, and introduction and promotion of biological nutrient enrichment are other alternative and promising soil-carbon and nutrient-improvement strategies. The combination of these measures is known as an integrated plant nutrient management system (IPNS), and it must be implemented to maintain and/or improve soil fertility. Apart from agronomic interventions, cultivar selection and crop improvement programmes need to particularly focus on lowinput soils, as farmers are resource-poor. Due to the complex soil, socio-economic, and institutional structures in these regions, an integrated and participatory strategy incorporating all stakeholders is essential for implementing agronomic interventions and productivity improvement programmes.

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“…However, different factors may affect the relative chlorophyll index measurements performed by these devices (Silveira & Gonzaga 2017). Therefore, the nitrogen sufficiency index (NSI) has been used with the purpose of isolating the effect of the N concentration in the leaves from other factors that may influence the readings (Hussain et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Fertilization factor associated with nitrogen sufficiency index for nitrogen topdressing fertilization in common bean

Nascimento

Moraes

Moreira

et al. 2021

Pesqui. Agropecu. Trop.

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The current recommendations for nitrogen (N) doses may not contemplate the complex dynamics of N in the soil, what may imply in insufficiency to the crop demand. This study aimed to evaluate the use of two portable chlorophyll meters (Minolta SPAD 502 and ClorofiLOG model CFL 1030), after defining the nitrogen sufficiency index (NSI), to estimate the nitrogen fertilization factor in modern bean genotypes. A block design was used, with four replications. Each experiment consisted of four treatments, with doses of 0, 5, 10 and 20 kg ha-1 of N for each 1 % considered below the NSI defined as adequate for each cultivar. At the end of the cycle, the production components and yield were evaluated. It was not possible to obtain precise adjustments in the methodology for the TAA Gol cultivar. The fertilization factor of 12.5 kg ha-1 of N for each 1 % below the NSI of 90 % proved to be efficient for the Pérola cultivar, when the SPAD-502 chlorophyll meter was used. In genotypes with size and cycle characteristics similar to those of the BRSMG Uai cultivar and the VR 20 strain, using a fertilization factor between 14 and 16 kg ha-1 of N, the NSI of 95 % must be reduced, in order to increase the efficiency of the nitrogen fertilization.

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Use of Chlorophyll Meter Sufficiency Indices for Nitrogen Management of Irrigated Rice in Asia

Cited by 143 publications

References 17 publications

Determination of traits responding to iron toxicity stress at different stages and genome-wide association analysis for iron toxicity tolerance in rice (Oryza sativa L.)

Determination of traits responding to iron toxicity stress at different stages and genome-wide association analysis for iron toxicity tolerance in rice (Oryza sativa L.)

Rice production in nutrient-limited soils: Strategies for improving crop productivity and land sustainability

Fertilization factor associated with nitrogen sufficiency index for nitrogen topdressing fertilization in common bean

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