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)
30 Jun 2026 (Vol - 57 , Issue- 07 )
31 Jul 2026 (Vol - 57 , Issue 07 )
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
Physiological and Biochemical Characterization of Variegation in Areca catechu Linnaeus Populations from South Karnataka, India
Variegation is the presence of discrete markings of different colours on plant parts and is of economic and scientific importance in ornamental crops. But variegation is rarely reported in perennial trees, especially in palms. This study reports the presence of variegation in areca palm, Areca catechu Linnaeus, an economically important plantation crop. The variegation traits were identified in the areca palms of Mangala and South Kanara Local (S.K. Local) varieties grown in Southern Karnataka, India. The variegated and non-variegated regions of the variegated leaves as well as the normal leaves were analysed for physiological parameters and the nuts of variegated and normal palms were studied for important biochemical constituents. The variegated and normal palms exhibited significant difference both physiologically and biochemically. The yellow regions of the variegated leaves lamina exhibited low photosynthetic rate, stomatal conductance, transpiration rate and chlorophyll index when compared to green region of variegated leaves as well as the normal leaves in both Mangala and S.K. Local varieties. The photosynthetic rate, stomatal conductance, transpiration rate and chlorophyll index of Mangala and S.K. Local varieties recorded in yellow regions of the variegated leaves were 1.1966 µ mole m-2s-1 and 1.7332 µ mole m-2s-1, 0.1028 mole m-2s-1 and 0.0683 mole m-2s-1, 2.3482 m mole m-2s-1 and 1.9983 m mole m-2s-1 and 16.7667 and 22.8333, respectively. The photosynthetic rate, stomatal conductance, transpiration rate and chlorophyll index of Mangala and S.K. Local varieties recorded in non-variegated leaves were 3.4348 µ mole m-2s-1 and 3.8569 µ mole m-2s-1, 0.2228 mole m-2s-1 and 0.1050 mole m-2s-1, 3.8307 m mole m-2s-1 and 2.9371 m mole m-2s-1, 67.00 and 66.20, respectively. However, stomatal resistance was observed to be low in green regions of variegated (1.4067 s cm-1 and 5.0333 s cm-1) and non-variegated leaves (1.7833 s cm-1 and 1.7833 s cm-1) in both the varieties when compared to yellow regions (8.3667 s cm-1 and 10.8667 s cm-1). Biochemical constituents like total sugar, total phenolics, non-tannin phenolics and antioxidant potential in terms of reducing power using CUPRAC and FRAP methods indicated wide variation between variegated and non-variegated nuts. Variegated plants are often valued for their aesthetic appeal. By understanding the physiological and biochemical basis of variegation in Areca catechu L., breeding programs could be devised to develop strategies to manipulate variegation so as to exploit the trait in an aesthetic point of view as well as to facilitate conservation efforts and formulate horticultural practices for cultivating these variegated palms. Further studies are warranted for better understanding of the mechanism, as well as the factors responsible for the variegation trait in Areca catechu L.
EFFECT OF RESIDUE MANGEMENT, NITROGEN MANGEMENT AND OSMOREGULATOR ON GROWTH OF RAINFED WHEAT
An investigation was carried out at Research Farm of Advanced Centre for Rainfed Agriculture, Rakh Dhiansar of Sher-e-Kashmir University of Agriculture Sciences and Technology of Jammu during Rabi season of 2022-23 and 2023-24 to study the effect of residue management, nitrogen management and osmoregulator on growth of rainfed wheat. The experiment consisting of three residue management practices viz. R1: Residue retention (Happy Seeder), R2: Residue incorporation (Super Seeder), R3: Conventional tillage and three nitrogen management viz., N1: 75 % of RDN, N2: 100 % of RDN, N3: 125% of RDN and two Osmoregulators viz., O1: 1.0 % KCl, O2: Water sprays. The results revealed that a significant increase in growth was observed in residue management residue incorporation (Super Seeder), nitrogen management in 125% of RDN and Osmoregulators in 1 % KCl.
Evaluation of barnyard millet germplasm for morphometric characterization, genetic diversity and screening against important endemic diseases in hills of Uttarakhand
In India, barnyard millet holds a significant importance, being cultivated as a climate resilient, dry land crop across a wide range of environmental conditions in poor and marginal soil under rainfed conditions for its highly nutritious grains as well as fodder, due to its diverse adaptive mechanisms. Availability of high yielding improved varieties with stable genetic resistance towards important endemic diseases are the utmost need in hills of Uttarakhand under the present scenario of climate change. Germplasm is an essential reservoir of favourable alleles for agronomic and quality traits. The detailed characterization will serve the requirement of long-term goals in plant breeding viz., climate change, duplicity of germplasm, depleting natural resources, trait specific resistant donors, and available genetic resources adapted to present climatic conditions. Therefore, the documentation of available germplasm is important to serve the near future goals of crop breeding programme. Considering the significance of the crop, one study was conducted using one hundred fifty-four germplasm lines of barnyard millet including four checks viz., PRJ-1, VL-172, VL-207 and DHBM-93-3 and those were planted in an augmented design. During the study, observations were recorded at different growth stages of barnyard millet for different visually assessed morphological qualitative traits, agro-morphometric quantitate traits, genetic diversity, and disease resistance. During the investigation, it was observed that a significant difference was present among the studied germplasm. The quantitative traits showed more than 75% heritability along with moderate to high genetic advance except days to maturity. The values for genotypic and phenotypic coefficient of variation were almost similar indicating that there was a less influence of environmental factors on the characters studied. From the present investigation, two germplasm i.e. BAR-1403 and BAR-1186 were identified as potential germplasm for grain yield and fodder yield having resistance for all endemic diseases of barnyard millet. These two germplasm lines from the bulk are of tremendous value and hold potential to be further used in the breeding programme to develop high yielding disease resistant improved varieties of barnyard millet.
Incidence and management practices of mango bark eating caterpillar, Indarbela quadrinotata in Bihar, India
Mango is an important fruit crop and affected by several insect pests and diseases. Among insects, bark eating caterpillar is a serious problem in Bihar and causes heavy losses. An investigation was conducted for incidence of this insect and its management. The study on incidence of bark eating caterpillar Indarbela quadrinotata Walker revealed that young orchards of mango were less prone to bark eating caterpillar infestation in comparison to old orchards. In management practices it was found that poorly managed young orchards of mango had only 20.40 per cent infestation in comparison to 90.05 per cent in old orchards. Among different management practices evaluated, cleaning the infected hole + plugging holes with cotton swab dipped in lambda cyhalothrin 5 EC @ 1ml/litre + plugging holes with mud showed maximum mortality (81.33% in 2019 and 82.68% in 2020) of bark eating caterpillar with highest yield (48.80 t/ha and 50.30 t/ha during 2019 and 2020, respectively) and increased yield over untreated control as 156.84 per cent and 171.89 per cent in 2019 and 2020, respectively.
TREND ANALYSIS OF CLIMATIC PARAMETERS IN THE CAUVERY DELTA REGION OF TAMIL NADU IN INDIA
Climate data on maximum and minimum temperature, relative humidity, air velocity and rainfall were collected from the concern District Collectorate and Agro Climate Research Centre, TNAU, Coimbatore for three districts (Tiruchirapalli, Thanjavur, and Pudukkottai) in the Cauvery delta region of Tamil Nadu, India, over a 10-year period (2009-2018). The average monthly maximum temperature (°C) was highest in May (38.30 ± 0.34 to 38.70 ± 0.40), and lowest in December (29.20 ± 0.20 to 30.00 ± 0.33). The average monthly minimum temperature (°C) was higher in May (28.30 ± 0.21 to 29.30 ± 0.21) but declined in January (19.70 ± 0.26 to 20.70 ± 0.15). The average monthly humidity (%) was high in November (78.30 ± 1.80 to 79.50 ± 1.65) and low in June and July (49.20 ± 1.63 to 50.60 ± 1.19). The average monthly air velocity (m/s) was more in June and July, ranging from 4.27 ± 0.20 to 4.69 ± 0.17, and least in October, ranging from 2.52 ± 0.12 to 2.79 ± 0.15. The average monthly rainfall (mm) was high in November (149.68 ± 36.44 to 225.20 ± 44.83) and low in February (3.41 ± 1.84 to 5.21 ± 2.33). During 2009-2018, the Mann-Kendall trend test revealed a significant (P<0.01) increasing positive trend for maximum and minimum temperatures and a non-significant decreasing negative trend for relative humidity, with the exception of Thanjavur district, where there was a significant (P<0.01) decrease in relative humidity. Similarly, the Mann-Kendall trend test indicated a non-significant increasing positive trend of air velocity but no trend in rainfall during the last decade (2009 to 2018) in Cauvery delta region of Tamil Nadu.