Salient Research Achievements

Assam Agricultural University has developed and evaluated improved crop varieties suited to the diverse agro-climatic conditions of Assam. Earlier achievements include landmark rice varieties Prachur, Satabdi, and Patkai; brinjal ABU (GB-09-12); coconut Kamrupa (Assam Green Tall); toria (rapeseed) AAU TS 38; and improved jute and sugarcane varieties.

During 2025–26, blackgram variety SBC-50 was officially released and recommended for late Kharif cultivation, expanding pulse cropping options across the state. In addition, three Lathyrus varieties (AAU Lathyrus-1, -2, and -3) and two rice bean varieties (JOR-21-1 and JOR-20-1, Muhita) were recommended for commercial and food-security farming in Assam.

In commercial floriculture, tuberose variety KHK TR-1, developed at the Horticultural Research Station, Kahikuchi, was recommended for cultivation, enhancing commercial flower production in the region.

Research in rice has identified key quantitative trait loci (QTLs) associated with drought tolerance, initiated high-throughput SNP-based genotyping and phenotyping of the ARAM panel, and advanced strategic breeding crosses combining dual tolerance to biotic and abiotic stresses.

Addressing the widespread problem of soil acidity in Assam, acid-tolerance-associated genes in Priestia megaterium G18 have been functionally investigated through targeted mutagenesis and CRISPR/Cas-based constructs. These frontier molecular studies strengthen the scientific foundation for breeding climate-resilient crop varieties adapted to environmental stresses in the region.

AAU established a standardized Agrobacterium-mediated transformation protocol for indigenous Bhimkol banana (Musa balbisiana) using embryogenic cell suspensions. Seventeen CRISPR-edited plantlets were successfully regenerated; four showed detectable target mutations, supporting ongoing investigations into developing seedless or reduced-seed commercial Bhimkol fruits while retaining their renowned nutritional value.

In chickpea, six engineered transgenic events expressing Cry1Ac or Cry2Aa endotoxins progressed to regulatory-permitted event-selection field trials for resistance against the devastating pod borer. Furthermore, gene-expression studies in pigeon pea expanded knowledge of molecular defense responses to simulated insect herbivory.

Research has produced site-relevant nutrient-management strategies combining mineral fertilizers, vermicompost, biofertilizers, and targeted foliar inputs. In multi-cropping experiments, a blackgram–rajmah sequential system reached an impressive 33.50 q/ha blackgram-equivalent yield with a benefit–cost ratio of 2.28.

Jute–greengram intercropping achieved 39.57 q/ha jute-fibre equivalent, surpassing sole jute by approximately 30.85%. A coconut–turmeric agroforestry multi-tier model recorded an exceptional benefit–cost ratio of 3.61. Improved precision fertigation arrangements were also standardized for garlic under water-saving drip irrigation.

Research has demonstrated the substantial potential of Trichoderma-based products, botanical treatments, predatory mites, and entomopathogenic fungi to minimize crop losses without chemical residues. AAU reported three solid and three liquid commercial biopesticide products involving Isaria javanica, Beauveria bassiana, and Trichoderma turialbense, alongside the identification of a virulent native Trichoderma asperellum isolate (BC3).

A Biozium-based seed and foliar treatment suppressed Alternaria blight in mustard, delivering a 47% yield increase over untreated experimental controls. Augmentative release of native Neoseiulus longispinosus predatory mites achieved 92.45% biological control of cucumber mites under field trial conditions. The University has also led dedicated research into ecological rodent management in boro rice ecosystems.

AAU designed, field-validated, and demonstrated a one-hectare rainfed Integrated Farming System (IFS) combining field crops, multi-tier horticulture, dairy cattle, aquaculture ponds, ducks, goatery, apiculture, liquid organic manure units, and vermicomposting.

The integrated model generated a benefit–cost ratio of 2.24, created 338 person-days of round-the-year employment, and elevated soil organic carbon by 46.7% above initial baseline levels. Remarkably, its reported greenhouse-gas balance during 2024–25 was −286.2 kg CO₂ equivalent, demonstrating that diversified smallholder agricultural models in Assam can function as net carbon sinks while driving high productivity and profitability.

To reduce human drudgery and enhance field efficiency, AAU developed a modified home-scale millet dehulling machine, a mechanized process for preparing rice flakes from brown rice, and innovative prototypes including a remote-controlled mini-transplanter, a tractor-operated orchard weeder, and an ergonomic riding-type paddy weeder.

The millet dehulling machine achieved impressive dehulling efficiencies of up to 91.6% for finger millet and 73.5% for foxtail millet under rigorous testing. An earlier landmark innovation includes a patented natural-draft gas-fired tea dryer specially engineered to cut energy costs and optimize drying efficiency for small tea growers in Assam.

Research accomplishments include nutrient-optimized rice-based ready-to-eat (RTE) functional food formulated specifically for elderly consumers, standardized brown-rice flaking protocols preserving essential micronutrients, and technology-transfer agreements for commercializing 100% natural, additive-free preserved Assam lemon juice.

In seed-storage science, research confirmed the effectiveness of hermetic HDPE bags in preventing atmospheric moisture reabsorption during high-humidity seasons, while neutral-silica treatment significantly enhanced rice-seed germination percentages and vigor during extended storage. These advances actively support regional agro-processing entrepreneurship and value addition.

Studies encompass pollinator bio-diversity, commercial honeybee management, and sustainable apiculture. The AICRP on Honey Bees and Pollinators, Jorhat Centre, was honored with national recognition as the Best Centre in India during 2024–25.

Pollination efficiency trials documented marked yield and seed-set enhancement across specialty crops including black cumin (Nigella sativa), mustard, and buckwheat. In apiary protection, recent experiments successfully identified effective eco-friendly food baits to trap and neutralize predatory wasps and hornets (such as Vespa cincta), preventing heavy colony losses.

AAU has evaluated physical barriers, solar-powered pulsating deterrent fencing, and bioacoustic approaches to mitigate crop damage by monkeys and vertebrate pests in rural agricultural belts. Heavy-duty HDPE net barriers mounted on bamboo pole structures prevented 80% to 100% of monkey intrusions into vegetable and horticultural crops in field trials.

Research also systematically documented rodent distribution across field crops, thrashing yards, and warehouse storage environments, providing empirical foundations for integrated, community-scale pest management strategies.

AAU pioneered investigations into bacterial isolates recovered from the gut of greater wax moth larvae (Galleria mellonella) as potential biological agents for synthetic plastic degradation. Selected bacterial isolates, predominantly Bacillus spp., degraded approximately 1% to 3% of synthetic plastic-polymer weight after 30 to 60 days in controlled laboratory experiments.

Furthermore, spent decaffeinated tea waste was evaluated and standardized as an eco-friendly biosorbent for the efficient removal of hazardous chromium and iron ions from contaminated aqueous effluents. These represent breakthrough early-stage applications in environmental remediation and circular bio-resource utilization.

Horticultural investigations characterized organic acid compositions and juice qualities across 38 indigenous citrus germplasm accessions from North-Eastern India, highlighting valuable parental lines for breeding and processing.

The University also recommended cut-flower tuberose variety KHK TR-1 for commercial cultivation, and identified native terrestrial and epiphytic orchid species ideal for commercial pot culture, hanging baskets, and urban landscaping. In citrus crop protection, biological control utilizing Isaria javanica suppressed live citrus leaf-miner mines by 72.13%.

Crucial animal science breakthroughs include development and performance stabilization of the crossbred HD-K 75 pig genotype, formal national registration of the indigenous Doom pig breed of Assam, formulation of a resilient thermostable Newcastle disease vaccine that requires no uninterrupted cold-chain, and an innovative extender medium for transporting pig semen over long distances for artificial insemination.

In small ruminants, AAU established model goat farming systems and Beetal goat research flocks at Nalbari to accelerate rural livelihood generation. Inland fisheries research has addressed fish breeding, riverine aquatic ecology, sustainable aquaculture technologies, and standardized the innovative Mantra trawl net operation for responsible fisheries exploration.

The AAU Annual Report 2025–26 documents five granted patents cumulatively, alongside active patent filings in various examination stages. The University has proactively facilitated geographical-indication (GI) registrations securing national and international protection for Assam's iconic heritage commodities: Joha Rice of Assam, Assam Lemon, Chokuwa Rice of Assam, Judima, and KajiNemu.

During 2025–26, commercial technology-transfer agreements were executed for Isaria javanica microbial biopesticide, Trichoderma harzianum bio-fungicide, and additive-free fresh Assam lemon juice preservation technology. These milestones bridge university laboratories directly with agribusiness enterprises and farm-level adoption.