Studying the spatial relationship between soil properties and wheat yield in the conditions of interference with weeds using geostatistical method

The aim of this research was to investigate the relationship between physical and chemical properties of soil and wheat yield in the conditions of competition with weeds in Isfahan weather conditions. In the crop year 2019-2020, a field experiment was conducted in the form of a grid system with a distance of 2 x 2 meters. At each grid point, soil characteristics, wheat grain yield and Chenopodium album density were measured. The results showed that soil characteristics, weed density, and wheat yield at the field were not uniformly or randomly distributed, but had patchy or cumulative distribution. The results showed that Chenopodium album had a moderate spatial correlation with soil sand and EC content and a strong spatial correlation with soil potassium, while this weed was found in soils with low amount of phosphorus, clay, silt and pH. The cross-semi-variogram showed that the grain yield has a strong spatial correlation with phosphorus, potassium, pH, and clay traits at the rates of 85.8, 80.0, 80.3, and 80.9, respectively were in the range of 2.9, 3.6, 4.0 and 2.8 meters. The areas where the wheat yield was lower were often in accordance with the areas where the sand and EC content of the soil were the highest. In total, the results indicated that the grain yield of wheat at the field changed from one place to another, or in other words, it had a patchy distribution that these changes are affected by soil and weed characteristics.