AMA, Agricultural Mechanization in Asia, Africa and Latin America
AMA, Agricultural Mechanization in Asia, Africa and Latin America (AMA) (issn: 00845841) is a peer reviewed journal first published online after indexing scopus in 1982. AMA is published by Farm Machinery Industrial Research Corp and Shin-Norinsha Co. AMA publishes every subjects of general engineering and agricultural engineering.
WOS Indexed (2026)
07 May 2026 (Vol - 57 , Issue- 05 )
31 May 2026 (Vol - 57 , Issue 05 )
Aim and Scope :
AMA, Agricultural Mechanization in Asia, Africa and Latin America
AMA, Agricultural Mechanization in Asia, Africa and Latin America (ISSN: 00845841) is a peer-reviewed journal. The journal covers Agricultural and Biological Sciences and all sort of engineering topic. the journal's scopes are in the following fields but not limited to:
Agricultural and Biological Sciences
Electrical Engineering and Telecommunication
Electronic Engineering
Computer Science & Engineering
Civil and architectural engineering
Mechanical and Materials Engineering
Transportation Engineering
Industrial Engineering
Industrial and Commercial Design
Information Engineering
Chemical Engineering
Food Engineering
Effect of Residual Weed Biomass and Nitrogen Levels on Growth and physiology of Toria in Rice-Based Cropping System
A field experiment was conducted to evaluate the effect of residual weed biomass incorporation and nitrogen levels on growth and physiological parameters of toria in a rice-based cropping system. The experiment consisted of two weed biomass treatments (with incorporation, W₁; without incorporation, W₀) and varying nitrogen levels (N₀ to N₁₆₀). Results revealed that plant height, dry matter accumulation, and leaf area index (LAI) were significantly influenced by both weed biomass incorporation and nitrogen levels at all growth stages, whereas their interaction (W × N) remained non-significant. Incorporation of weed biomass (W₁) consistently recorded higher growth attributes compared to W₀. Similarly, increasing nitrogen levels significantly enhanced these parameters, with maximum values observed under N₁₆₀. Physiological parameters, including Crop Growth Rate (CGR) and Relative Growth Rate (RGR), were also significantly improved with weed biomass incorporation and higher nitrogen levels, while their interaction effect remained non-significant. The highest CGR and RGR were recorded under W₁ and N₁₆₀ treatments. In contrast, Net Assimilation Rate (NAR) was not significantly affected by weed biomass incorporation but showed significant variation with nitrogen levels. NAR increased with higher nitrogen at early growth stages but declined at later stages due to increased canopy development and mutual shading effects. Overall, the study indicated that incorporation of weed biomass and higher nitrogen application improved growth and physiological efficiency of toria independently. The results suggest that integrating organic biomass with optimal nitrogen fertilization enhances crop performance by improving soil conditions, nutrient availability, and photosynthetic capacity in rice-based cropping systems.
Molecular Assessment of Genetic Diversity and Identification of Drought-Tolerant Indigenous Rice (Oryza sativa L.) Cultivar of Manipur using SSR Markers
Rice (Oryza sativa L.) is a major staple crop supporting the livelihood and food security of more than half of the world’s population. However, at present drought stress is one of the most critical abiotic constraints affecting rice productivity, particularly in rainfed ecosystems. The present study was undertaken to assess the genetic diversity of 30 rice genotypes, including 23 indigenous cultivars from Manipur and 7 released varieties, were evaluated using 17 SSR markers associated with drought tolerance Quantitative Trait Loci (QTLs). Genomic DNA was extracted using the CTAB method and amplified through PCR. Out of the 17 markers used, 15 showed polymorphism and were used for further analysis. The polymorphic information content (PIC) values ranged from 0.50 to 0.78 with an average of 0.64, indicating that the selected markers were highly informative for diversity analysis. Genetic dissimilarity among the genotypes was estimated using Jaccard’s dissimilarity coefficient, which ranged from 0.19 to 0.98, demonstrating considerable genetic variation among the studied genotypes. The minimum dissimilarity was observed between Tomila and Hungyo, whereas the maximum dissimilarity was recorded between Shbhagi dhan and RCPL-17-1. Cluster analysis using the Unweighted Pair Group Method with Arithmetic Mean (UPGMA) grouped the 30 genotypes into four distinct clusters. Cluster I contained 8 genotypes including the drought-tolerant check Sahbhagi Dhan and MAS-26, while Cluster II, III, and IV comprised 7, 9, and 6 genotypes respectively. The results indicate that SSR markers linked QTLs associated with drought tolerance are effective tools for assessing genetic diversity in rice. The identified diverse genotypes can serve as valuable genetic resources for marker-assisted breeding programs aimed at developing drought-tolerant rice varieties for the rainfed ecosystems.
Effect of Protein and Energy on semen production & its quality profiles and preservability in caprine species of Bay Islands
The present study was designed to evaluate the effect of dietary protein and energy supplementation on the reproductive physiology, semen production, semen quality and fertility of goat bucks under the humid tropical island ecosystem of the Andaman and Nicobar Islands. A total of twenty-four healthy bucks was randomly divided into four dietary groups: control (ICAR standard ration), 20% more protein (MP), 20% more energy (ME) and a combined supplementation of 20% more protein and energy (MPE). The experiment was conducted under the semi-intensive management system across the rainy and dry summer seasons. The scrotal and testicular biometrics, endocrine profiles, antioxidant status, sexual behaviour, semen production, semen quality parameters and fertility rate were evaluated. The result revealed that the bucks treated with combined supplementation (20% MPE) had shown significantly (p < 0.05) higher body weight, scrotal circumference, testicular volume and testicular weight as compared with the other groups. Endocrine profiles revealed that higher concentrations of FSH, LH, testosterone, TSH, T3 and T4 along with lower cortisol and prolactin levels were observed in the MPE group. Antioxidant markers such as TAC, SOD, CAT and GSH were significantly enhanced whereas malondialdehyde (MDA) levels and oxidative stress index were significantly reduced. The sexual behaviour scores such as libido and mating ability were also significantly improved. Semen characteristics such as volume, sperm concentration, motility, viability, acrosomal integrity, plasma membrane integrity and nuclear integrity were higher in the MPE group whereas the sperm abnormalities and lipid peroxidation were lower. The rainy season was more favourable for the reproductive performance as compared to the stressful dry summer season. The in-vivo fertility trials revealed that higher kidding rates and greater numbers of kids were observed in animals inseminated with semen from MPE-treated bucks under both farm and field conditions. The results revealed that dietary supplementation with 20% additional protein and energy effectively mitigated the seasonal stress, improved the endocrine balance and antioxidant defence and enhanced the semen quality and fertility rate in goat bucks under humid tropical island conditions. This nutritional strategy was served as a practical approach to improve the reproductive efficiency and semen preservation in caprine species of tropical humid island ecosystems.
Impact of scientifically designed housing on heat stress mitigation and performances of dairy cattle in humid tropical islands
Temperature humidity index (THI) triggers significant challenges to the livestock species on productivity, physiology and health. Housing design plays important roles in mitigation of these challenges. This 12-month comparative study was conducted at ICAR-CIARI, Sri Vijaya Puram, Andaman and Nicobar Islands, India with use of 48 crossbred dairy cattle equally divided between the two housing systems: a modern shed and a traditional shed. Macro- and micro-environmental THI, physiological profiles, hematological parameters, biochemical profiles, hormone profiles, oxidative stress markers, reproductive traits and milk quality profiles were estimated. The cattle housed in modern shed had exhibited significantly (P < 0.05) higher productive and reproduction performances. A higher (18.5%) average daily milk yield in cows (5.23 vs. 3.91 kg/day), higher growth rates in the calves (463.15 vs. 389.95 g/month) and earlier onset of reproductive maturity in the heifers (473.60 vs. 527.80 days to first heat) were reported in new shed housed cattle. Similarly, physiological profiles and biochemical parameters revealed higher blood values (hemoglobin: 11.08 vs. 9.53 g/dL), reduced oxidative stress (Thiobarbituric Acid Reactive Substances; TBARS: 1.74 vs. 2.33 nmol/mL) and lower cortisol (20.94 vs. 25.54 ng/mL) were reported in animals housed in new shed. The micro-climatic THI was significantly (p<0.05) lower in new shed (77.93 vs. 80.63) as compared to old shed; thus modern shed had enhanced thermal comfort in it. This study concluded that scientifically designed housing systems significantly improved the productivity, reproductive performance, health and welfare in cattle under humid tropical island ecosystem.
Stock Assessment and Population Dynamics of Common Carp (Cyprinus carpio Linnaeus, 1758) from Ottu Reservoir, Haryana, India
The present study assessed the population parameters and stock status of common carp (Cyprinus carpio) from the Ottu reservoir, Haryana, India using length-frequency data of 716 fish samples analysed through the FISAT-II software package. The asymptotic length (L∞) and growth coefficient (K) were 369.43 mm and 0.72 year-1, respectively with a growth performance index (φ′) of 4.99 indicating moderate growth. Natural mortality (M), fishing mortality (F), and total mortality (Z) rates were 1.1 year⁻¹, 1.73 year⁻¹ and 1.84 year⁻¹ respectively. Recruitment pattern indicates a single annual recruitment with a major peak during August-September. It was observed that the likelihood of capture at L25, L50, and L75 was 271.26, 296.15 and 307.71 mm, respectively with length at first capture (Lc) estimated at 296.15 mm. The relative yield per recruit (Y΄/R) and biomass per recruit (B΄/R) were 0.80 and 1.01, respectively. The exploitation (E) rate was estimated at 0.63, which indicated the fish was overexploited (E> 0.50) in the Ottu reservoir. These results indicate that in order to effectively utilization of C. carpio in Ottu reservoir, suitable fisheries management methods like limiting fishing effort and mesh size regulation are required.