بررسي تاثير بارندگي بر عملكرد محصولات گندم و جو در استان گلستان

Precipitation Effects on Yield Productions of Wheat and Barley in Golestan Province

Climate condition is one of the most important factors which affect agricultural productions. Amongst climatic parameter, precipitation variability is one of the most crucial factors which has important role on agricultural productions because of its effect on available water for plants. Therefore, agriculture is sensitive and vulnerable to precipitation. This study investigates the effects of precipitation and its variability on yield productions of two important crops includes wheat and barley in Golestan province. In this order, the production yield of wheat and barely in 33 rural service centers during 20 years was inspected. After getting requested data (such as, monthly precipitation and crops yield in two conditions of irrigated and dry-land farming for a period of 20 years), some statistical tests (e.g., outlier data test) was applied, then the trends of yield production through the time for each corps was determined. For determining of the effects of precipitation time with respect to crops yield, linear regression analysis via two methods (e.g. Enter and Stepwise methods), was implemented. Finally, the effect of yearly precipitation changes on crops yield was specified. The results shown that the production yield of wheat during the study period has more correlation with lime, in comparison with barley. In addition, fluctuations of monthly and yearly precipitation can influence on barley production (esp., dry-land farming). Influence of wheat production yield in term of precipitation fluctuation is very low. It revealed that June, November and December rainfall have more effect on wheat yield. On the other hand primal and last months of planting duration have more effect on barely yield production.