× خانه ژورنال ها پست ها ثبت نام ورود

the stady and analysis of rice agroclimatology in lenjan

پایان نامه

وزارت علوم، تحقیقات و فناوری - دانشگاه یزد - دانشکده جغرافیا

دانشجو : صفورا رجبی مورکانی

استاد راهنما : کمال امیدوار احمد مزیدی

سال انتشار:1392

15 صفحه اول

کلمات کلیدی : برنج- اقلیم کشاورزی- لنجان- دما-

چکیده

the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so it seems necessary to analyze climatic elements for appropriate planning of planting, reaping and harvesting timing of crops. forasmuch as rice is the most important daily meal and it has been grown in lenjan city for consecutive years and also according to government support of rice cultivation to reduce dependences, the expansion rice cultivation in this area would be useful for farmers and other related jobs. in this research, for more detailed study of climatic elements (include temperature, precipitation, wind and relative humidity) on rice yield, in addition to daily data of lenjan’s climatic elements, data collected from other 4 weather stations ( include esfahan, daran, natanz and najaf abad) during a period of 15 years( 1375- 1390) about different stages of rice cultivation are analyzed. then the correlation between climatic elements and rice yield has been analyzed in selected stations. ultimately after drawing the climatic maps, height levels and slope, final map of zoning appropriate areas from inappropriate ones for rice cultivation according to effective elements is drawn by means of gis. results of this research indicate that there is a completely appropriate area about 492 square kilometers which located in the central areas and in alluvial plains. minimal damage due to late spring frost and early fall frost occurred in this areas of land. primary roots, stems and rice clusters rise up rapidly, but it may be facing a shortage of precipitation to supply required water. the appropriate areas encompass the most part of the map which is about 738 square kilometers. the appropriate and completely appropriate areas encompass about 75 percent of total areas. 345 square kilometers of this area is poor or inappropriate for rice cultivation which located in altitude margin and close to the mountain and is composed of rocky and steep and non-agricultural land. climatic elements analyses indicate that in all selected stations, wind and temperature affect most of the appropriate and completely appropriate areas during different stages of rice growth, but precipitation rate in selected stations for all stages of rice cultivation does not provide required water and rice needs to be irrigated. furthermore relative humidity rate during different stages of rice cultivation in lenjan city is adequate and of other studied stations are sustainable. key words: rice, agro climatology, temperature, precipitation, relative humidity, wind and lenjan.

برای دانلود 15 صفحه اول ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

ورود

منابع مشابه

Rice (Oryza sativa L.) is providing food of half of the world population, and in some regions salinity stress reduces yield of this plant. In order to develop planting of rice in regions with saline water or fields, chlorophyll rate, chlorophyll fluorescence indices and grain yield of some rice cultivars were evaluated in summer, 2012, at the farm of college of Agriculture, at Yasouj University...

Cold stress is one of the most important environmental stresses for rice especially in temperate and high elevation areas. In present study, the effect of different temperatures, as the main plot, including 25 (control), 10 and 5°C on 12 rice cultivars (including Champa Yasouj, Gerde, Lenjan Askari, Kaamfirouz, Kohsar, Shafagh, Domsiya Mamassani, Dular, Gharib, Hasan saraei, Mosa Tarom and 304)...

results mycoflora profiles of fresh and stored rice grains showed that aspergillus species (37.3%, 40.7%) were the predominant fungal agents, followed by fusarium (21.6%, 16.2%), mucor (19.6%, 16.7%) and rhizopus (9.8%, 11.1%), respectively. in hplc analysis, most of the rice samples (96.7%) collected were found to be positive for fb1 with mean levels ranging from not detected to 56.2 mg/kg for...

objective: the usage of pesticides has increased during the recent years. one the other hand, presence of harmful pesticides residue in rice and other food has caused a great concern among the consumers. therefore, it is important to develop some pragmatic procedures to increase the food safety along with the reduction in consumption of pesticide residues. methods: a gas chromatograph with elec...

Salinity is one of the most extensive environmental stresses and is a limiting factor for the growth and development of crops, such as rice. Then, an experiment based upon completely randomized design with four low levels (0, 7.5, 15, 22.5) and four high of salinity (75, 150, 225 and 300 mM) with control as the first factor and nine cultivars of rice (dollars, Hasan Saraii, Mousa Tarom, Kamfiru...