فهرست مطالب seyed erfan momenpour

Identification of the most effective indicators as well as the effect of spatial and temporal differences on the yield of rainfed chickpeas in major cultivation areas of Kermanshah province were the main objectives of this research. A map of major rainfed chickpea cultivation areas in the province was drawn by crop statistics. Then, the farms of this crop were extracted using the digital map layer of chickpea fields on the received images of Modis sensor from 2000 to 2021. In the next step, 9 plant spectral indices for chickpeas over the four climatic regions of Kermanshah in the flowering growth stage were calculated during a period of 22 years. These 9 spectral indices, together with the variable of total precipitation as independent variables and yield data as a dependent variable entered into the stepwise regression model. The results showed that NDVI and precipitation indices are the most effective indices of yield variability during flowering stage of chickpea in Kermanshah. Furthermore, NDVI, PVI and SAVI indices in the cities of Islamabade Gharb, Dalahou and Songhar are the most effective indices during the studied period, respectively. The results of validation revealed that the statistical model of Kermanshah city was more accurate than other cities. The correlation coefficient of the statistical model for estimating chickpea yield in this city was 0.69 with a standard error of 84 kg/ha-1. In addition, the relative deviation values of the statistical model of this city were less than other models.

Recognition the climatic potential of the regions for planting the horticultural crops is the first step in agricultural planning. In order to achieve this goal, one of the most important tools is to use agro-climatic classification methods. In this research, the Papadakis classification method was used which has a high level of accuracy due to the presence of 440 climatic subgroups and the emphasis on ecological characteristics. Initially, 10 synoptic weather stations were selected with a common statistical period of 23 years (1994-2016) due to the continuity of statistical data. It should be mentioned that each weather station was represented the climate condition of each city and the stations were classified according to the climatic indices of the Papadakis method. The results of the study showed that three stations namely Abadan, Bostan and Mahshahr port had a hot sub-tropical climate which is highly suitable for planting tropical crops. In addition, Aghajari, Ahvaz, Behbahan and Ramhormoz regions, due to the sub-tropical semi-arid Mediterranean climate, and also in Izeh, Safi Abad and Masjed Soleiman regions because of the sub-tropical semi-arid Mediterranean climate, are suitable for planting various types of cold season temperate fruits, citrus and early and late season vegetables.