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Research article · 2025 · Full text

International Journal of Agriculture and Nutrition

Cluster frontline demonstrations on improved production technology of black gram in rainfed areas

Kirti KalitaChandni Sarma

Volume 7(4) · Pages 56–59 · DOI: 10.33545/26646064.2025.v7.i4a.383 ↗

Research areasAgricultural Development and ManagementAgricultural Innovations and PracticesAgricultural Economics and Practices

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Abstract

Author-written

A persistent gap between research station yields and farmer field yields of black gram—often exceeding 40 percent—points to a breakdown in technology transfer rather than a shortage of improved varieties. Cluster Frontline Demonstrations (CFLDs) are the Indian Council of Agricultural Research's primary mechanism for closing this gap by showcasing proven production packages on farmers' own fields. This research assessed the impact of 200 CFLDs on black gram (Vigna mungo L.) conducted across rainfed areas of West Bengal and Maharashtra over four consecutive kharif seasons (2019-20 to 2022-23). Each demonstration used improved variety IPM 02-3 with a complete technology package including seed treatment, balanced fertilization, integrated pest management, and timely harvesting. Demonstration plots consistently out-yielded farmer practice (check) plots: mean yields were 0.98 t ha⁻¹ versus 0.59 t ha⁻¹ across four years, representing an average yield advantage of 66.1 percent. The technology gap (potential yield minus demonstration yield) narrowed from 0.53 t ha⁻¹ in 2019-20 to 0.38 t ha⁻¹ in 2022-23. Extension gap (demonstration minus check) averaged 0.39 t ha⁻¹. The benefit-cost ratio under demonstration technology ranged from 2.41 to 2.87 compared with 1.62 to 1.89 for farmer practice. These results confirm that CFLDs effectively bridge the yield gap and improve profitability of rainfed black gram production.

Summary

Source-checked

Plain-language reading of the full paper, prepared with AI and checked against the text. Each point links to the authors' own words.

  1. Why it matters

    • There is a significant gap, often over 40%, between the yields of black gram achieved at research stations and those achieved in actual farmer fields, suggesting a failure in transferring technology. View evidence ↗

      Why it matters

      There is a significant gap, often over 40%, between the yields of black gram achieved at research stations and those achieved in actual farmer fields, suggesting a failure in transferring technology.

      In the paper's own words

      “A persistent gap between research station yields and farmer field yields of black gram—often exceeding 40 percent—points to a breakdown in technology transfer rather than a shortage of improved varieties.”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗
    • Black gram is a prime candidate for Cluster Frontline Demonstrations (CFLDs) because it is mostly grown by smallholders in rainfed areas using outdated seeds and minimal inputs. View evidence ↗

      Why it matters

      Black gram is a prime candidate for Cluster Frontline Demonstrations (CFLDs) because it is mostly grown by smallholders in rainfed areas using outdated seeds and minimal inputs.

      In the paper's own words

      “Black gram is particularly suited to CFLD intervention because it is grown overwhelmingly under rainfed conditions by smallholders who use few purchased inputs and rely on saved seed of outdated varieties”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗
    • The Indian Council of Agricultural Research (ICAR) uses CFLDs to bridge yield gaps by organizing groups of 10 or more farmers in a single village to showcase improved technologies at a community scale. View evidence ↗

      Why it matters

      The Indian Council of Agricultural Research (ICAR) uses CFLDs to bridge yield gaps by organizing groups of 10 or more farmers in a single village to showcase improved technologies at a community scale.

      In the paper's own words

      “CFLDs were introduced by ICAR specifically to address this problem. Unlike conventional demonstration plots, CFLDs are organized in contiguous clusters of 10 or more farmers in a single village, creating a visible, community-scale showcase of improved technology”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗

  2. The question

    • The study aimed to quantify the yield advantage of improved black gram technology over traditional farmer practices, calculate yield gaps, and evaluate the economic viability of the technology package over four years in West Bengal and Maharashtra. View evidence ↗

      The question

      The study aimed to quantify the yield advantage of improved black gram technology over traditional farmer practices, calculate yield gaps, and evaluate the economic viability of the technology package over four years in West Bengal and Maharashtra.

      In the paper's own words

      “This research analysed four years of CFLD data from West Bengal and Maharashtra to (i) quantify the yield advantage of improved technology over farmer practice, (ii) calculate technology and extension gaps across seasons, and (iii) assess the economic viability of the recommended package.”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗

  3. What they did

    • The research evaluated 200 Cluster Frontline Demonstrations of black gram across rainfed regions of Maharashtra and West Bengal during four kharif seasons from 2019-20 to 2022-23. View evidence ↗

      What they did

      The research evaluated 200 Cluster Frontline Demonstrations of black gram across rainfed regions of Maharashtra and West Bengal during four kharif seasons from 2019-20 to 2022-23.

      In the paper's own words

      “This research assessed the impact of 200 CFLDs on black gram (Vigna mungo L.) conducted across rainfed areas of West Bengal and Maharashtra over four consecutive kharif seasons (2019-20 to 2022-23).”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗
    • Each 0.4 ha demonstration plot used the IPM 02-3 variety and a package including specific seed treatments (carbendazim and Rhizobium), balanced NPK fertilization, foliar DAP spray, and integrated pest management. View evidence ↗

      What they did

      Each 0.4 ha demonstration plot used the IPM 02-3 variety and a package including specific seed treatments (carbendazim and Rhizobium), balanced NPK fertilization, foliar DAP spray, and integrated pest management.

      In the paper's own words

      “Each demonstration covered 0.4 ha of a participating farmer's field. The improved variety IPM 02-3 (released by IIPR, Kanpur) was used with the full technology package: seed treatment with carbendazim (2 g/kg) + Rhizobium culture (25 g/kg), basal fertilizer at 20-40-20 kg N-P₂O₅-K₂O ha⁻¹, foliar spray of 2% DAP at flowering, IPM-based pest management, and harvest at physiological maturity.”

      Page 2

      Found in: Introduction

      Read it in the full textOpen PDF at page 2 ↗
    • To provide a comparison, adjacent check plots were maintained using the farmers' traditional varieties and existing input practices. View evidence ↗

      What they did

      To provide a comparison, adjacent check plots were maintained using the farmers' traditional varieties and existing input practices.

      In the paper's own words

      “The adjacent check plot used the farmer's own variety and input practices.”

      Page 2

      Found in: Introduction

      Read it in the full textOpen PDF at page 2 ↗
    • The study measured the 'technology gap' as the difference between the potential yield (1.4 t ha⁻¹) and the demonstration yield, and the 'extension gap' as the difference between demonstration and check yields. View evidence ↗

      What they did

      The study measured the 'technology gap' as the difference between the potential yield (1.4 t ha⁻¹) and the demonstration yield, and the 'extension gap' as the difference between demonstration and check yields.

      In the paper's own words

      “Technology gap was computed as potential yield (1.4 t ha⁻¹ for IPM 02-3 under rainfed conditions) minus demonstration yield. Extension gap was demonstration yield minus check yield.”

      Page 2

      Found in: Introduction

      Read it in the full textOpen PDF at page 2 ↗

  4. What they found

    • Over the four-year period, demonstration plots achieved a mean yield of 0.98 t ha⁻¹, compared to 0.59 t ha⁻¹ for farmer practice plots, an average advantage of 66.1%. View evidence ↗

      What they found

      Over the four-year period, demonstration plots achieved a mean yield of 0.98 t ha⁻¹, compared to 0.59 t ha⁻¹ for farmer practice plots, an average advantage of 66.1%.

      In the paper's own words

      “Demonstration plots consistently out-yielded farmer practice (check) plots: mean yields were 0.98 t ha⁻¹ versus 0.59 t ha⁻¹ across four years, representing an average yield advantage of 66.1 percent.”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗
    • Demonstration yields increased from 0.87 t ha⁻¹ in 2019-20 to 1.08 t ha⁻¹ in 2022-23, while check yields only increased from 0.54 to 0.63 t ha⁻¹. View evidence ↗

      What they found

      Demonstration yields increased from 0.87 t ha⁻¹ in 2019-20 to 1.08 t ha⁻¹ in 2022-23, while check yields only increased from 0.54 to 0.63 t ha⁻¹.

      In the paper's own words

      “Demonstration yields improved steadily from 0.87 t ha⁻¹ in 2019-20 to 1.08 t ha⁻¹ in 2022-23, while check yields rose more modestly (0.54 to 0.63 t ha⁻¹).”

      Page 2

      Found in: Introduction

      Read it in the full textOpen PDF at page 2 ↗
    • The technology gap decreased from 0.53 t ha⁻¹ in the first year (2019-20) to 0.38 t ha⁻¹ by the final year (2022-23). View evidence ↗

      What they found

      The technology gap decreased from 0.53 t ha⁻¹ in the first year (2019-20) to 0.38 t ha⁻¹ by the final year (2022-23).

      In the paper's own words

      “The technology gap (potential yield minus demonstration yield) narrowed from 0.53 t ha⁻¹ in 2019-20 to 0.38 t ha⁻¹ in 2022-23.”

      Page 1

      Found in: Introduction

      Read it in the full textOpen PDF at page 1 ↗
    • The technology index dropped from 37.9% to 22.9%, showing that farmers gradually closed the gap between actual and achievable yields. View evidence ↗

      What they found

      The technology index dropped from 37.9% to 22.9%, showing that farmers gradually closed the gap between actual and achievable yields.

      In the paper's own words

      “technology index declined from 37.9 to 22.9 percent, indicating that farmers progressively closed the gap between achievable and actual demonstration yields.”

      Page 2

      Found in: Introduction

      Read it in the full textOpen PDF at page 2 ↗
    • The cost of cultivation for the demonstration technology was ₹24,680 ha⁻¹, which was 34.6% higher than the ₹18,340 ha⁻¹ cost of farmer practice. View evidence ↗

      What they found

      The cost of cultivation for the demonstration technology was ₹24,680 ha⁻¹, which was 34.6% higher than the ₹18,340 ha⁻¹ cost of farmer practice.

      In the paper's own words

      “Cost (₹ ha⁻¹) | 24,680 | 18,340 | 6,340 | +34.6”

      Page 2

      Found in: Introduction

      Read it in the full textOpen PDF at page 2 ↗
    • Despite higher costs, the demonstration technology produced a net return of ₹39,020 ha⁻¹, which is 95% higher than the ₹20,010 ha⁻¹ return from farmer practice. View evidence ↗

      What they found

      Despite higher costs, the demonstration technology produced a net return of ₹39,020 ha⁻¹, which is 95% higher than the ₹20,010 ha⁻¹ return from farmer practice.

      In the paper's own words

      “Despite a 34.6 percent increase in cultivation cost, the demonstration technology generated a 95 percent higher net return—₹39,020 versus ₹20,010 ha⁻¹”

      Page 3

      Found in: Introduction

      Read it in the full textOpen PDF at page 3 ↗
    • The benefit-cost (B:C) ratio for the demonstration technology was 2.58, outperforming the 2.09 ratio of traditional farmer practice. View evidence ↗

      What they found

      The benefit-cost (B:C) ratio for the demonstration technology was 2.58, outperforming the 2.09 ratio of traditional farmer practice.

      In the paper's own words

      “and a superior B:C ratio of 2.58 compared with 2.09 for farmer practice.”

      Page 3

      Found in: Introduction

      Read it in the full textOpen PDF at page 3 ↗

  5. What it means

    • The authors recommend scaling up the cluster approach to more rainfed blocks and using farmer-to-farmer networks to accelerate technology adoption and close the national yield gap. View evidence ↗

      What it means

      The authors recommend scaling up the cluster approach to more rainfed blocks and using farmer-to-farmer networks to accelerate technology adoption and close the national yield gap.

      In the paper's own words

      “Scaling up the cluster approach to additional rainfed blocks, combined with farmer-to-farmer extension networks, should accelerate adoption and help close India's persistent pulse yield gap.”

      Page 3

      Found in: Conclusion

      Read it in the full textOpen PDF at page 3 ↗

Visual summary

3 visuals

Illustrations explain the paper; charts are replotted from the paper's own table values.

AI-generated illustration
AI-generated conceptual illustration (black gram plants in rainfed soil). It explains the idea and does not show study data.↗ Enlarge
Comparison of Production Packages
AI-generated conceptual illustration (black gram plants in rainfed soil). It explains the idea and does not show study data.

AI-generated conceptual illustration (black gram plants in rainfed soil). It explains the idea and does not show study data.

Open full-size image ↗

Comparison of Production Packages

AI-generated conceptual illustration (black gram plants in rainfed soil). It explains the idea and does not show study data.

View source evidence ↗
Replotted from source data
Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.↗ Enlarge
Demo Yield (t ha⁻¹) and Check Yield (t ha⁻¹): 2019-20 vs 2020-21 vs 2021-22 vs 2022-23
Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.

Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.

Open full-size image ↗

Demo Yield (t ha⁻¹) and Check Yield (t ha⁻¹): 2019-20 vs 2020-21 vs 2021-22 vs 2022-23

Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.

View source evidence ↗
Replotted from source data
Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.↗ Enlarge
Tech. Gap (t ha⁻¹): 2019-20 vs 2020-21 vs 2021-22 vs 2022-23
Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.

Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.

Open full-size image ↗

Tech. Gap (t ha⁻¹): 2019-20 vs 2020-21 vs 2021-22 vs 2022-23

Replotted from Table 1 (page 2) of the original paper. Every bar is the paper's own table value.

View source evidence ↗

Figures & tables

From the original paper
Yield performance of CFLDs on black gram over four kharif seasons (2019-20 to 2022-23)Table 1Page 2Economic analysis of CFLD technology versus farmer practice for black gram (4-year mean)Table 2Page 2Yield trends of demonstration plots versus farmer practice (check) across four kharif seasons, with percentage yield advantageFigure 1Page 2Timeline diagram showing the five stages of the cluster frontline demonstration protocol implemented over four yearsFigure 2Page 3
FULL TEXT Original article · reflowed for reading

Introduction

Year after year, India's pulse production statistics tell the same story: black gram yields at the national level hover around 0.55 to 0.65 t ha⁻¹, while research stations routinely demonstrate that 1.2 to 1.5 t ha⁻¹ is achievable with existing varieties and management packages [1] . The gap between what is possible and what farmers actually harvest-the extension gap-persists because improved technologies reach farmers slowly, incompletely, or not at all [2] . CFLDs were introduced by ICAR specifically to address this problem. Unlike conventional demonstration plots, CFLDs are organized in contiguous clusters of 10 or more farmers in a single village, creating a visible, community-scale showcase of improved technology [3] . Each participating farmer receives seed, fertilizer, and technical guidance, and a nearby plot under the farmer's usual practice serves as a paired control. The cluster approach amplifies the visual impact and encourages peer-to-peer learning [4] . Black gram is particularly suited to CFLD intervention because it is grown overwhelmingly under rainfed conditions by smallholders who use few purchased inputs and rely on saved seed of outdated varieties [5] . The potential for yield improvement through simple changesreplacing local seed with certified seed of a high-yielding variety, treating seed with Rhizobium and fungicide, applying recommended P and K, and timing harvest correctly-is large relative to the cost of the intervention [6] . This research analysed four years of CFLD data from West Bengal and Maharashtra to (i) quantify the yield advantage of improved technology over farmer practice, (ii) calculate technology and extension gaps across seasons, and (iii) assess the economic viability of the recommended package. Demonstration yields improved steadily from 0.87 t ha⁻¹ in 2019-20 to 1.08 t ha⁻¹ in 2022-23, while check yields rose more modestly (0.54 to 0.63 t ha⁻¹). The yield advantage increased from 61.1 to 71.4 percent over the four years. The technology index declined from 37.9 to 22.9 percent, indicating that farmers progressively closed the gap between achievable and actual demonstration yields. Despite a 34.6 percent increase in cultivation cost, the demonstration technology generated a 95 percent higher net return-₹39,020 versus ₹20,010 ha⁻¹-and a superior B:C ratio of 2.58 compared with 2.09 for farmer practice.

Material and Methods

Material and Methods

Material

Material

Discussion

The 66.1 percent mean yield advantage of demonstration over farmer practice is higher than the 30-45 percent range typically reported for pulse CFLDs in central India [7,8] . This larger gap likely reflects the very low baseline yields in the rainfed areas of West Bengal and Maharashtra, where most farmers still use unimproved local seed without seed treatment or balanced fertilization [5] .

The declining technology index (37.9 → 22.9%) across four years is an encouraging sign. It means that farmers participating in repeat demonstrations-and their neighbours observing the clusters-are gradually adopting components of the technology package. The seed treatment + Rhizobium inoculation combination, being the cheapest and easiest to adopt, showed the highest spontaneous uptake (68% of neighbouring farmers adopted it by Year 4), while balanced fertilization was adopted by only 34 percent, likely because of higher cost [9] . The B:C ratio of 2.58 under demonstration technology is attractive enough to justify the additional input cost of ₹6,340 ha⁻¹. For every additional rupee invested, the farmer receives ₹3.00 in additional net return-a compelling economic argument for technology adoption [10] .

Conclusion

Four years of CFLDs confirmed that improved production technology-centred on variety IPM 02-3, seed treatment, balanced fertilization, and IPM-based pest managementcan raise rainfed black gram yields by an average of 66.1 percent over farmer practice. The net return nearly doubled, and the B:C ratio improved from 2.09 to 2.58. The progressive narrowing of the technology index over four years indicates that CFLDs are fulfilling their intended role as technology dissemination tools. Scaling up the cluster approach to additional rainfed blocks, combined with farmer-to-farmer extension networks, should accelerate adoption and help close India's persistent pulse yield gap.

Acknowledgement

Acknowledgements Funding SourcesThis research was conducted under the ICAR-funded Cluster Frontline Demonstration scheme on pulses. Institutional SupportThe authors thank BCKV Mohanpur and VNMAU Parbhani for logistical and technical support during the four-year demonstration program.

Figures and tables from the paper

Table 1. Yield performance of CFLDs on black gram over four kharif seasons (2019-20 to 2022-23)
YearDemo Yield (t ha⁻¹)Check Yield (t ha⁻¹)Yield Advant. (%)Tech. Gap (t ha⁻¹)Ext. Gap (t ha⁻¹)Tech. Index (%)No. of CFLDs
2019-200.870.5461.10.530.3337.950
2020-210.940.5862.10.460.3632.950
2021-221.020.6167.20.380.4127.150
2022-231.080.6371.40.320.4522.950
Mean0.980.5966.10.420.3930.0200

Table text extracted from the original PDF; superscript letters are shown inline. The original table image is below.

View original table image
Yield performance of CFLDs on black gram over four kharif seasons (2019-20 to 2022-23)↗ Enlarge
Table 1
Yield performance of CFLDs on black gram over four kharif seasons (2019-20 to 2022-23)

Yield performance of CFLDs on black gram over four kharif seasons (2019-20 to 2022-23)

Open full-size image ↗
Original paper tableSource PDF · page 2 ↗
Table 2. Economic analysis of CFLD technology versus farmer practice for black gram (4-year mean)
ParameterDemo TechnologyFarmer PracticeDifference% Change
Cost (₹ ha⁻¹)24,68018,3406,340+34.6
Gross return (₹ ha⁻¹)63,70038,35025,350+66.1
Net return (₹ ha⁻¹)39,02020,01019,010+95.0
B:C ratio2.582.090.49+23.4

Table text extracted from the original PDF; superscript letters are shown inline. The original table image is below.

View original table image
Economic analysis of CFLD technology versus farmer practice for black gram (4-year mean)↗ Enlarge
Table 2
Economic analysis of CFLD technology versus farmer practice for black gram (4-year mean)

Economic analysis of CFLD technology versus farmer practice for black gram (4-year mean)

Open full-size image ↗
Original paper tableSource PDF · page 2 ↗
Figure 1. Yield trends of demonstration plots versus farmer practice (check) across four kharif seasons, with percentage yield advantage
Yield trends of demonstration plots versus farmer practice (check) across four kharif seasons, with percentage yield advantage↗ Enlarge
Figure 1
Yield trends of demonstration plots versus farmer practice (check) across four kharif seasons, with percentage yield advantage

Yield trends of demonstration plots versus farmer practice (check) across four kharif seasons, with percentage yield advantage

Open full-size image ↗
Original paper figureSource PDF · page 2 ↗
Figure 2. Timeline diagram showing the five stages of the cluster frontline demonstration protocol implemented over four years
Timeline diagram showing the five stages of the cluster frontline demonstration protocol implemented over four years↗ Enlarge
Figure 2
Timeline diagram showing the five stages of the cluster frontline demonstration protocol implemented over four years

Timeline diagram showing the five stages of the cluster frontline demonstration protocol implemented over four years

Open full-size image ↗
Original paper figureSource PDF · page 3 ↗

References

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