Differences in location and rhizosphere cause differences in species diversity and population of Arbuscular Mycorrhizal Fungi (AMF). In addition, not all AMF have the same morphological and physiological characteristics, therefore it is very important to know their identity. This study aims to determine the presence and number of spores as well as to determine the morphological characteristics of AMF originating from the rhizosphere of several horticultural crops in the agricultural land of Payakumbuh State Agricultural Polytechnic. The method used in this research is descriptive exploratory method by means of purposive sampling for soil sampling. While the stages of this research include: taking and collecting data in the field, determining the point of location for soil sampling, taking soil samples, analyzing soil properties in the laboratory, isolating AMF spores and identifying AMF spores morphologically. The conclusions of this study are 1) The population of AMF spores in horticultural land is high. The highest spore population was found in soil samples of the root area of shallot plants (556 spores per 10 g of soil), while the lowest number of spores was in soil samples of eggplant root areas (271 spores per 10 g of soil), 2) AMF exploration in several horticultural crops in the agricultural land of the Payakumbuh State Agricultural Polytechnic, based on morphological identification (shape, color and size), the AMF found consisted of three genera, namely Glomus sp, Gigaspora sp, and Scutelospora sp.

The Gunung Omeh citrus (Citrus nobilis Lour.) is one of the priority commodities in the agricultural sector of West Sumatra. It has been cultivated in several locations in Lima Puluh Kota Regency, one of which is Guguak District. Using various cultivation techniques the fruits produced are highly diverse phenotypically. The purpose of this study was to figure out the phenotypic diversity of Gn. Omeh citrus derived from Guguak District based on morphological characters. This study was conducted from April to October 2021. The research used a survey method and descriptive analysis. Ten samples of citrus plants were taken using a purposive sampling technique at each location in Guguak District. The morphological characters observed included those of the stem, leaf, and fruit. Data analysis was carried out by an analysis of genetic diversity. Results of the observation of quantitative characters showed that there were variations across the 5 locations observed. Meanwhile, the observation of qualitative characters showed a broad range of leaf and bud colors across 5 locations. Phenotypic diversity was due to genetic diversity, which in turn was caused by cultivation techniques and planting location altitudes.