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The present investigation deals with the genetic divergence, correlation, and path coefficient study for the six characters among sixty-two accessions of Ammi visnaga L. grown during two consecutive years, 2018-2019 and 2019-2020, in India. Morphological variability was detected for stem and umbel color from center reddish to pink during vegetative growth. In this study, high genetic co-variance (GCV) and high heritability with maximum genetic advance (GA), and high mean percentage were noticed for biological yield and harvest index and seed yield. These auspicious traits would possibly be governed by additive gene effects, which could help select the best genotypes using an appropriate breeding strategy for crop improvement. The highest positive and significant genotypic and phenotypic correlation coefficient was recorded for the number of umbels correlated between biological yields and seed yield. On the other hand, the path coefficient study revealed that the harvest index has the maximum direct contribution followed by biological yield, number of primary branches, and umbels on the seed yield. Results clearly showed variation in important economic traits could facilitate selection for further genetic improvement in A. visnaga genotypes. In this study, several unique accessions were identified that might be exciting genotypes for the genetic modification of the different morphometric characters in the hybridization program. The accession no. AV-45 was having the highest carotol (66.1 %), followed by AV-7 carotol (66.0 %). Therefore, these accessions can be further exploited for commercial production. [ABSTRACT FROM AUTHOR]

To find out the influence of harvesting height on essential oil yield and composition, threeOcimumspecies viz.O. basilicumL.,O. kilimandscharicumGuerke andO. tenuiflorumL., were harvested at different heights in foothills agroclimatic conditions of north India. Three cut heights viz. top 1/3rd; top 2/3rd and whole plant were carried for the experiment in respective species and their chemotypes. The essential oil yield was reported to be higher in top 1/3rd harvested part of studiedOcimumspp. Altogether, 86 constituents, representing 89.2 - 99.9 % of the essential oil composition were identified by GC(RI) and GC-MS. Monoterpenoids (4.4 -90.4 %) and phenylpropanoids (61.4 -88.9 %) were the major class of constituents distributed in studiedOcimumspp. Significant variations in essential oil yield and composition, in terms of the content of marker constituents, were observed due to different harvesting heights in studiedOcimumspp. [ABSTRACT FROM PUBLISHER]

A field experiment was conducted to study the influence of combined use of farm yard manure and inorganic fertilizers on biomass and essential oil yields, chemical and microbial biomass carbon and nitrogen of soil grown with peppermint (Mentha piperita) in a hilly region, Bageshwar, India. Combined application of both farm yard manure and inorganic fertilizers increased the biomass and oil yields of peppermint compared to sole inorganic fertilizers treatments. The treatments receiving both farm yard manure and inorganic fertilizers improved the soil organic carbon and total N from initial value of 3.9 to 7.0 g kg-1soil and 0.27 to 0.58 g kg-1soil, respectively. A significant improvement has been noticed in soil respiration, soil microbial biomass carbon and nitrogen compared to inorganic fertilizer alone. Moreover, different proportions of inorganic fertilizers with farm yard manure had significant variation on available major soil nutrients. A significant correlation coefficient (r= 0.41* to 0.98**) was observed between yields and soil properties. The quality of essential oil was good and acceptable for the market. [ABSTRACT FROM PUBLISHER]

Survey and collection was done during the year 2005 and 2006 to collect accessions and domesticate at experimental farm at Central Institute of Medicinal and Aromatic Plants, Research Centre, Purara. A field experiment was conducted during 2005-2009 to evaluate the 18 accessions of Indian Oregano (Origanum vulgare L.) collected from western Himalaya region of Uttarakhand. All the accessions collected were screened for herb yield and essential oil yield. The highest herb yield was recorded in 'OV7' (926.40 gm) followed by 'OV4' and 'OV9' with 671.40 and 635.00 gm, respectively. The essential oil yield was found to be highest in accession 'OV7' (1.83 ml). The 'OV4' accession dominated by thymol as the major compound yielded 1.40 ml followed by 'OV9' with carvacrol as major compound yielding 1.26 ml. The result of the experiment evaluated accession 'OV7' for high herb and essential oil yield. While accessions 'OV4' and 'OV9' can be domesticated as high thymol and carvacrol rich lines. [ABSTRACT FROM AUTHOR]