Qualitative Land Suitability Evaluation of Ahar Yakhfarvazan for Sugar Beet, Onion and Maize by Simple Limitation and Parametric Square Root Methods

In this research work qualitative land suitability evaluation was carried out for Sugar beet، Onion and Maize in Ahar Yakhfarvazan rejoin of East Azerbijan، according to data of 18 mapping units (4 representative profiles) and climatic data that were collected from Ahar climatological station. Based on Sys et al tables all landscape، soil، and climate requirements for sugar beet، onion and maize and qualitative suitability class of the above-named crops were determined by simple limitation and parametric square root methods. According to the obtained results in simple limitation method 16. 66%، 72. 22% and 11% of the studied area were moderately and marginally suitable، and permanently unsuitable for sugar beet، respectively. Also 12%، 44% and 44. 44% of the studied area for onion and 27. 77%، 33. 33% and 38. 88% of it for maize were moderately and marginally suitable and permanently unsuitable، respectively. In parametric square root method، 44. 44% of the studied area was marginally suitable and 55. 55% was unsuitable for sugar beet. Also 33. 33% of the studied area was marginally suitable، 66. 66% was unsuitable for onion. Furthermore، 27. 77% of the studied area was moderately suitable، 16. 66% was marginally suitable and 55. 55% was unsuitable for maize. Therefore، the obtained results confirm the fact of higher efficiency of parametric square root method than simple limitation one and in addition to climatic limitations، OC and particles percentage˃2mm are very important limitation factors