عنوان مقاله [English]
The growth and development of plants depends on the genetic structure and the environment and water conditions (Creasy, 2009: 24). One of the basic ways for agricultural development is optimal land use, in accordance with climatic conditions. Essentially, it is necessary to recognize different factors, such as stability factors (elevation, soil, slope) and unstable factors (climate factors). Grapes are grown throughout the world and used alone in a variety of products. Grape cultivation is one of the major horticultural industries, with its cultivated area in the world of 7.9 million hectares (Mohammadi, 2013: 58). In general, the aim of this study was to find new areas for grape cultivation in Qare-Sou basin, considering the water conditions and vegetative needs of the grapevine, and, by investigating and identifying the positive and negative factors, the spread of cultivation Grapes or limiting it around the study area.
Materials and methods
Calculate the degree of growth day index
Plant growth, like all biological phenomena, depends on the thermal power of the environment. The growth of each plant begins at a certain temperature threshold. For example, the grape threshold is 10 degrees centigrade. In this research, Equation 1 was used to calculate GDD (Mousavi, 1393: 117).
GDD = (Tmax +Tmin )/2-Tbase
In this equation, TMAX is the maximum temperature, Tmin is the minimum temperature and Tbase is the threshold temperature or plant's base temperature. If the day is zero or negative, then that day will not affect growth. So, we can calculate the GDD index for each station with the average temperature of each month and convert it to the average daily temperature and base temperature (for grapes 10) (Mousavi, 1393: 117).
Average temperature during growth (T)
For its calculation, Equation 2 is used, which means the average temperature of the plant growth moths that has been accumulated since the onset of the growth of the plant, which begins with germination and ends with the arrival of the grape fruit, and computes the average(Mousavi, 1393: 117).
Techniques used in this research
1. Saw SAW method
Results and discussion
First, by drawing maps in the GIS environment, we conclude that east of the river is not suitable for the cultivation of grapes, and as the west moves up, the preference for cultivating grapes increases, this priority in the northern part of Meshkin shar has reached the right place and again, as we go north stream, the priority of grape cultivation has been reduced, however, this reduction is not as high as the east mound, and the Mashiran area is considered medium for cultivation, as in the Lahrud region, but the boundary partially differs in different methods. In addition, in all methods around Kaleybar, the most suitable and best area for grape cultivation was obtained. Secondly, by interpreting the graphs and maps from the potential evapotranspiration calculations, we conclude that as we go from east to the westside of the river, the water requirement of the region increases due to high evapotranspiration and negative balance of water.
Investigations carried out with five different methods in Chapter 4, it can be concluded that most of the Qare-Sou and surrounding areas are suitable for grapevine cultivation. Grapes have a little need for water in relation to the currently cultivated crops, as well as a diverse and diverse nutritional value, high pharmaceutical value, high health and treatment, and the glacial effect due to the delay in the beginning of grape germination and water diversity And the region's airspace and the existence of the river are less than the surrounding area. Therefore, with better management, it is possible to prevent waste of water in the area and, at a lower cost, produce a valuable, nutritious and profitable product.
By using five different methods, it can be concluded that most of Qarhosu and its surrounding areas are suitable for grapevine cultivation. Grapes have a little need for water in relation to the currently cultivated crops, as well as a diverse and diverse nutritional value, high pharmaceutical value and high health and treatment, as well as glacial effects due to the delay in the beginning of grape germination and water diversity. And the region's airspace and the existence of the river are less than the surrounding area. Therefore, with better management, it is possible to prevent waste of water in the area and, at a lower cost, produce a valuable, nutritious and profitable product.