جستجوی مقالات مرتبط با کلیدواژه « land evaluation » در نشریات گروه « زراعت »

Land evaluation and its consistency with simulation model’s outputs could assist decision making to develop plants for cultivation. In this study land suitability and potential yield of cumin was determined using CUMMOD and sum of values method by climatic and topographic factors, respectively, as a case study in Khorasans provinces. Results revealed that despite of the majority of favorable and completely favorable zones, potential yield was not the same in studied provinces. The CUMMOD results revealed that southern, a part of central and a part of northern areas of northern Khorasan province have considerable capability to produce cumin (2.5 to 3 ton ha-1). Potential yield was in two classified ranges as 2- 2.5 ton ha-1 and < 2 ton ha-1, while, predicted potential yield for central and southern parts of South Khorasan province was <2 ton ha-1 and 2-2.5 ton ha-1 for corresponding northern parts. Slope and aspect for northern, aspect and maximum temperature for Razavi and maximum temperature for southern Khorasan were the most limiting factors. In this study, although limiting factors were detected, but the majority of zones were located in favorable and completely favorable zones, because sum of values method avoids exaggerated effects of some factors. Therefore, results are more realistic. Overall, our results confirmed that the potential yield will decrease along with moving from northern Khorasan province toward South Khorasan province, which stems from shortening of the growing season.

The study was carried out in the fields of Department of Agriculture, University of Lorestan, Iran (Lat. 32°18´ N., Long. 45°22´ E.). According to the data gathered in the nearest synoptic meteorological station, the studied region is classified under semi-arid climates. Mean maximum and minimum daily temperatures have been recorded in July and January as 29.5 and 5.5°C, respectively. Mean annual precipitation is 509 mm. Four control profiles were selected out of 30 dug profiles. The soils were in two categories of Inceptisols and Entisols. In total, 4 families and 12 soil field units were recognized. The objective of the current study was to compare the qualitative evaluation of land suitability and radiation-thermal production potential of sugar beet in two regions of Khorramabad and Silakhoor Plain, Iran, by FAO method. Results showed that sugar beet production potential was 67950 kg.ha-1 in Khorramabad and the land suitability classes were determined as S2 and S3 by parametric method, whereas land suitability classes were S2, S3 and Ns in Silakhoor Plain. The main soil constraints included CaCO3, relief and detritus in Khorramabad, while they were drainage, relief, soil texture, detritus, soil reaction and exchangeable Na percentage in Silakhoor. Therefore, farmers can improve the productivity by removing the modifiable limitations and improving management. But, the expenses of physical, chemical and mineralogical analysis of soil samples were low in this study.