Title: Investigation of spatial variations of primary high consumption elements and some important characteristics of soil fertility in paddy soils of Guilan province

Author: Hassan Shokri vahed

Abstract: Mapping of soil properties makes it possible for fertilizer and crop management recommendations to exactly match the different soil properties and quality groupings. Ignoring these disparate areas results in inefficient crop management. One of the important reasons for insufficient success in predicting effective plant growth factors is related to the lack of spatial distribution information of soil properties.  In this experiment, in order to investigate the spatial variability and dispersion of the primary nutrients including nitrogen, phosphorus, and potassium and some important soil fertility characteristics including pH, EC, OC, and texture, composite sampling from 0 to 30 cm depth of paddy fields in Masal, Rudbar, Meghdad (Khoshkbijar, Lashtnesha, Khomam) and Siahkal in 1397 before any fertilizer application and land preparation. After the preparation of the results, the status of the properties was evaluated based on descriptive statistics. Subsequently, the areas of excess and nutrient deficiency in paddy fields were determined. The results showed that phosphorus was one of the major limitations in the studied areas so that more than 80% of the soils of Siahkal, 72% of the soils of Rudbar, 65% of Masal, and 54% of Megadad had P deficiency. Evaluation of paddy soils at the sampling points indicated that the important nutrients were not geographically similar, so it was necessary to refrain from recommending fertilizer application equally to avoid increasing production costs and achieving optimal production.

Keywords: Descriptive statistics, Paddy fields, Rice, Spatial variability, Macronutrient

Contact: shokri_v@yahoo.com