This study analyses the gaps and issues in the production and distribution system of maize seed in Nepal. A total of 682 households were surveyed in 2017 by employing multistage random sampling with probability proportionate to size by representing different (tarai and hill) agro-ecological zones. Twelve focus group discussions (FGDs) and four key informant interviews (KII) were also carried out. Results showed that the old varieties like Rampur Composite and Manakamana-3 are still popular in the farmers' fields. The cost of seed production was about 48% and the profit of the producer was 18% of the consumer price. The share of wholesalers was 15% of the consumer price whereas it was 19% for retailer/agro-vet. The average total cost of production was found to be $1392/ha and gross income was $1925/ha with the 1.38 average B C ratio; it is, therefore, a lucrative enterprise. Out of a total of 27 released varieties, only 12 varieties have been used in seed production. Results revealed that 83% of the farmers cultivate open-pollinated maize varieties whereas 17% of them cultivate hybrid maize varieties. Seventy-five per cent of seed was from a formal source. The maize productivity, hybrid maize area, and seed replacement were below the targets set in Nepals' National Seed Vision, a policy document of the government. Focus on the production of nucleus and breeder seed by Government research farms and use of these seeds by private seed companies and community seed producing groups to produce next generation foundation seeds are urgently required. Equally important is enabling private and community-based organizations to produce hybrid seeds of the crop.Fallowing is considered an important management strategy for the restoration of soil productivity. Therefore, a three-year fallow of pigeon pea (Cajanus cajan), mexican sunflower (Tithonia diversifolia) and elephant grass (Pennisetum purpureum) was established at Landmark University, Nigeria between 2016 - 2019.  https://www.selleckchem.com/screening/chemical-library.html  Leaf nutrient concentrations of maize (Zea mays) planted with soils taken from each fallowed plots after three years were also determined. The experimental design was a randomized complete block design with three replications. Soil samples were collected from each fallow plots for physical and chemical analysis (bulk density, porosity, moisture content, particle size, dispersion ratio, soil erosion loss, soil organic matter (SOM), total N, available P, exchangeables K, Ca, Mg, CEC and pH.) before and at the end of the experiment. Means of data collected were separated using Tukey's HSD test at p = 0.05. Tithonia fallow improved soil properties and leaf nutrient concentration of maize compared with Pennisetum and Cajanus fallows. The order was Tithonia > Pennisetum > Cajanus. This was adduced to the regular return of plant residues to the soil in Tithonia fallow which resulted in high SOM (Tithonia increased SOM by about 23%, 7.5%, and 20%, respectively, compared with the initial soil, Pennisetum and Cajanus fallows) and increases soil N, P, K, Ca, Mg, CEC and pH and also stabilized soil structure by increasing porosity, moisture content and reducing bulk density, dispersion ratio, and soil loss. Therefore, plant species of high nutrient contents and high return of biomass to the soil are necessary for quick restoration of soil productivity in a derived savanna ecology.The morphology and quantitative chemical analyses of fifty alluvial gold grains from fourteen studied sites were used to constraint gold deposit type and its implications to exploration in the Abiete-Toko Gold District in South Cameroon. The main results revealed that the gold grains show a core-rim zonation marked by Ag depleted rims as a result of leaching during transportation. The fineness of grains ranges from 826 to 1000 and their composition is almost binary gold-silver. Gold fineness refers to the relative amounts of Ag and Au present, given as a number out of 1000 and defined by Au/(Ag + Au)∗1000. The chemical composition of the gold grains are range as thus 83.40-100 wt.% Au, 0.07-17.45 wt.% Ag, 0-0.96 wt.% Cu, 0-0.01 wt.% As, 0-0.02 wt.% Ni, 0-0.02 wt.% Co, 0-0.01 wt.% Se, 0-0.08 wt.% Hg and 0.003-0.03 wt.% S. The high sulphur concentrations of the gold grains probably imply primary deposition of gold by sulphidation; The ranges of Ni and Co concentrations suggest an interaction with greenstones. Such findings indicate that the Abiete-Toko area hosts a mesothermal-orogenic gold deposit. Exploration operations must target fractures and contact zones between ironstones, felsic gneiss and greenstones. Soil sampling is not recommended in this orogenic gold district due to the very thick and transported nature of the weathering mantle. Detailed mapping coupled to geophysical surveys are the recommended key exploration methods prior to drilling program.The aim of current study was to investigate the effect of dietary L-Carnitine (LC) in immature roosters on reproductive hormones, lipid profile and testicular histology at the time of maturity. Eighteen 12-wk-old breeder roosters (Ross 308) of similar weights were randomly allocated into 3 dietary treatments (LC-0 basic diet, LC-250 basic diet + 250 mg LC/kg of diet, LC-500 basic diet + 500 mg of LC/kg of diet) in 6 replicates. The feeding program and photoperiod regimen were performed based on ROSS 308 management handbook. Dietary LC supplementation markedly improved testicle weight and testicle index (p less then 0.05). Comb height was also affected by LC supplementation (p less then 0.05). The testicle weight and index, comb height, and shank lengths improved linearly with increasing levels of dietary LC (p less then 0.05). The LC-250 and LC-500 diets significantly improved the number of sertoli cells (NSC), height epithelium seminiferous tubules (HEST), seminiferous tubules diameter (STD), spermioge5). Thus, adding up to 250g of LC per kg of the rooster chicken can improve reproductive hormones, blood lipids and testicular histology parameters at the time of maturity.This study presents the K-Ar geochronology for hydrothermal K-feldspar in plagioclase alteration, including methodology and application to the Toki granite, in central Japan. Borehole samples from the Toki granite were collected and mechanically and chemically processed to separate plagioclase from the rock and remove bulk impurities. The sample fraction of cleaned plagioclase powder was further processed to a smaller size fraction, allowing separation of the altered K-feldspar from the plagioclase host. The resulting K-feldspar represented the hydrothermal alteration product and was characterized crystallographically as microcline, and its K-Ar ages were measured. The results of the K-Ar dating and petrographic characterization indicated that in this setting, plagioclase alteration occurred through a combination of solid-state replacement and dissolution-precipitation processes. The K-feldspathization age enables constraint of the temporal conditions of the solid-state replacement process to 62.2 ± 1.4 Ma. The time-temperature (t-T) path of the sampling site is an effective tool for determining both the timing and thermal conditions of the hydrothermal microcline formation in plagioclase alteration.