Impact of frontline demonstrations on yield enhancement and technology dissemination in cabbage (Brassica oleracea var. capitata L.) under farmer field conditions in Churachandpur district, Manipur

Introduction

Cabbage (Brassica oleracea var. capitata L.), a member of the Brassicaceae family, is one of the most widely cultivated and nutritionally important vegetable crops globally. It ranks among the top twenty vegetables produced worldwide, highlighting its significant role in human diets and food security (FAO, 2014) [8] . The crop is valued for its high moisture content, dietary fiber, and essential nutrients, including vitamin C, vitamin A, B-complex vitamins, calcium, potassium, and iron (Adeniji et al., 2010; Hasan & Solaiman, 2011) [1,9] . In addition, cabbage is a rich source of glutamine, glucosinolates, phenolics, and other antioxidative compounds associated with anti-inflammatory and anti-carcinogenic properties (Caunii et al., 2010; Kusznierewicz et al., 2008) [5,12] . In Manipur, particularly in Churachandpur district, cabbage is a major winter-season vegetable crop contributing substantially to household nutrition and farmer livelihoods. Despite favorable agro-climatic conditions, productivity remains low due to the predominance of traditional cultivation practices, use of low-yielding local varieties, inadequate nutrient and pest management, and limited awareness of scientific production technologies. Consequently, a large gap persists between farmers' yields and the potential yield achievable through recommended agronomic practices.

Frontline Demonstrations (FLDs), implemented through the Indian Council of Agricultural Research (ICAR), serve as an effective extension approach for validating and disseminating improved technologies under real farm conditions. By demonstrating high-yielding varieties and standardized production packages, FLDs help bridge knowledge gaps, assess technology feasibility, and enhance farmer adoption. This study evaluates the impact of FLDs on cabbage production in Churachandpur district to quantify yield improvement and understand technology adoption dynamics. The study was undertaken with the following objectives: 1. To evaluate the performance of improved cabbage production technologies under farmers' field conditions through FLDs. 2. To quantify the yield gap between improved practices and existing farmer practices. 3. To estimate extension gap, technology gap, and technology index. 4. To enhance farmer knowledge and adoption of scientific cabbage cultivation practices.

Materials and Methods

Study Area

The study was conducted in eight villages of Churachandpur district-Tollen, Kholmun, Talian, Henkot, Yaiphakol, Mata, Matiyang, and L. Molvom-selected based on cabbage-growing potential and farmer interest. The district receives 1,000-1,200 mm annual rainfall with cool, favorable temperatures during rabi, making it suitable for cabbage cultivation.

Frontline Demonstrations (FLDs)

A total of 20 FLDs were carried out over four seasons (2012-13 to 2015-16). Each demonstration covered 0.2 ha, while an adjacent plot under local practices served as a control for comparison.

Technologies Demonstrated

Table 1 presents the key differences between FLD interventions and farmers' practices, extracted from the source file.

Sowing and transplanting

Broad casting in nursery, transplanting as per farmers suitability

Raised quality seedlings in the raised nursery beds, line sowing and transplant after 5-6-week-old seedlings with 4-6 leaves. Transplanting is done in the evening. Immediately after transplanting, irrigation is provided. Recommended spacing i.e. row to row and plant to plant 60 cm x 45cm.

Manure and Fertilizers application

Less fertilizers dose FYM or compost @ 15 to 20 tonnes/ha is incorporated in the soil during land preparation. Besides FYM, N: P: K @ 100:80:60 kg/ha is applied. Full amount of phosphorus and potash along with half amount of nitrogen is applied at the time of transplanting. Remaining amount of nitrogen is applied in two split doses i.e. 30 and 45 days after transplanting as top dressing.

Intercultural operations

No weeding, few or no irrigation is given. Earthingup is rarely practiced Two weeding, shallow hoeing to loosen the soil for better aeration and earthing-up after 30 -40 after transplanting. Light and frequent irrigation followed as and when required.

Data Collection

• Demonstration yield (q/ha) • Farmer practice yield (q/ha) • Potential yield (400 q/ha)

Results and Discussion

Yield Performance

The results from four years of frontline demonstrations (FLDs) clearly showed that adoption of improved production technologies significantly enhanced cabbage yield compared to existing farmers' practices. Demonstration yields ranged from 320 to 335 q/ha, whereas traditional practices produced only 140 q/ha, leading to a yield increase of 128.57-139.29%. Similar yield advantages from improved agronomic practices in cole crops have been reported by Meena et al. (2018) [13] , Teggelli et al. (2015) [20] , and Choudhary et al. (2018) [6] , confirming that hybrid varieties combined with balanced nutrient management consistently outperform local seed and traditional methods.

The high yield under FLDs can be attributed to the superior genetic potential of the hybrid variety 'Green Hero', which is known for its compact heads, uniform maturity, and tolerance to biotic stress (Hasan & Solaiman, 2011) [9] . Additionally, improved nursery management, appropriate spacing (60 × 45 cm), and soil testing-based fertilizer application resulted in vigorous vegetative growth and optimal canopy development.

Studies by Adeniji et al. (2010) [1] and ICAR (2017) [10] have emphasized that plant spacing, nutrient status, and seedling Vigor are major determinants of cabbage yield, which directly aligns with the improvements observed in the present study.

Extension Gap Analysis

The extension gap, i.e., the difference between demonstration yield and farmers' practice yield, ranged from [4] and Baruah et al. (2015) [2] . 2. Poor knowledge of pest and nutrient management, especially in tribal and hilly regions (Rao et al., 2014) [15] . 3. Lack of scientific nursery raising techniques, which affect seedling vigor and final yield.

The FLDs helped bridge this gap by providing input support and hands-on training, which resulted in better skill development, as also highlighted by Bhardwaj et al. (2017) [3] .

Technology Gap

The technology gap (potential yield -demonstration yield) decreased from 80 q/ha in 2012-13 to 65 q/ha in 2015-16. This decreasing trend indicates improved adaptability and successful refinement of the demonstrated technologies over time.

According to Samui et al. (2000) [16] , a reduction in technology gap reflects farmers' increasing capacity to implement scientific recommendations accurately. The persistence of some gap is expected because potential yield (400 q/ha) is generally obtained under optimal research-station conditions with full resource availability. Field-level constraints such as unpredictable rainfall patterns, soil fertility variation, sporadic pest outbreaks, and labor shortages naturally limit demonstration yields (Sharma et al., 2013; Pal & Chatterjee, 2012) [17,14] . Nevertheless, the consistent decline in technology gap shows that farmers increasingly adopted the improved practices and better understood hybrid performance.

Technology Index

The technology index ranged from 25.00% (initial year) to 19.40% (final year). A lower technology index denotes higher feasibility and acceptance of the technology under real farming situations. Declining technology index over the years signifies that the recommended package of practices is more farmerfriendly, economically viable, and suited to local agro-ecological conditions. Similar decreasing trends have been documented in cole crops and other vegetables under FLDs by Singh et al. (2016) [19] ,

Meena et al. (2018) [13] , and Choudhary et al. (2018) [6] , further supporting the current findings. The results imply that once farmers gain experience with a new technology, adoption accelerates, and performance improves.

Influence of Improved Production Technologies 3.5.1 Role of Hybrid Variety 'Green Hero'

Hybrid cabbage varieties possess heterosis advantages such as vigorous growth, higher head density, and disease tolerance.

Studies by Caunii et al. (2010) [5] and Kusznierewicz et al.

(2008) [12] also suggest that hybrids maintain higher nutrient content, which indirectly correlates with better yield and quality. The superior performance of 'Green Hero' is consistent with earlier reports on hybrid vigour in cabbage (Meena et al., 2018) [13] .

Effect of Scientific Nursery Practices

Raising seedlings on sterilized nursery beds minimizes dampingoff and ensures uniform, healthy transplants. As reported by Adeniji et al. (2010) [1] , high-quality seedlings are essential for achieving high yields in Brassicaceae vegetables. The FLD approach standardized nursery techniques, contributing to better field establishment and yield.

Nutrient Management

Application of 100:80:60 kg NPK/ha along with FYM significantly enhanced vegetative growth and head formation. Balanced nutrition is known to increase chlorophyll content, photosynthetic rate, and biomass accumulation in cabbage (Hasan & Solaiman, 2011; ICAR, 2017) [9,10] . Dramatic yield improvement under FLDs confirms these findings.

Integrated Pest Management

Major pests-diamondback moth (Plutella xylostella), aphids, and cutworms-are responsible for 30-60% yield losses in cabbage if unmanaged (Kumar et al., 2019) [11] . The adoption of need-based IPM components (Bt formulations, Dimethoate, neem extracts) effectively reduced pest incidence in FLD plots compared to farmer practice, contributing significantly to higher yields. Similar success of IPM interventions has been reported in cole crops by Choudhary et al. (2018) [6] .

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