نتایج جستجو برای: 39 soil were collected from different sources agriculture
تعداد نتایج: 7889187 فیلتر نتایج به سال:
Applying of intensive cultivation especially in marginal and sensitive regions, after conversion of rangelands to cropland farms, commonly causes reduction in soil quality, and thus an increase in soil degradation, erosion and runoff. This study was conducted to evaluate the land use change effects on some soil physical and chemical properties such as mean weight diameter (MWD), soil organic ...
One of unfavorable factors in agriculture in each geographical region is exquisite winds which with increasing evaporation and transpiration amount led to decrease in water use efficiency. Therefore, it is necessary to control with the most adaptable Plants as the windbreak. This study was conducted to ascertain the most adaptation of windbreak in Damghan arid region. The climatic information ...
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...
abstract this study evaluated and compared medical terminology and english for the students of medicine (ii) as two representatives of the textbooks available on the iranian market for teaching english to the students of medicine. this research was performed on the basis of a teacher’s and a number of students’ attitudes and the students’ needs analysis for two reasons: first, to investigate...
Applying of intensive cultivation especially in marginal and sensitive regions, after conversion of rangelands to cropland farms, commonly causes reduction in soil quality, and thus an increase in soil degradation, erosion and runoff. This study was conducted to evaluate the land use change effects on some soil physical and chemical properties such as mean weight diameter (MWD), soil organic ...
High value crop producers in California rely heavily on soil fumigation to control a wide array of soil borne pests including nematodes, pathogens and weeds. Fumigants with broad biocidal activity can affect soil microbial communities that contribute to nutrient cycling and plant nutrient uptake which can impact soil health. It is often thought that soil microbial communities make a relatively ...
BACKGROUND Zinc is an essential micronutrient used in the form of zinc sulfate in fertilizers in the agriculture production system. Nitrogen-fixing microorganisms are also of considerable value in promoting soil fertility. OBJECTIVES This study aimed to investigate the degree of sensitivity to varying concentrations of zinc, in the form of ZnSO4, in different strains of Azotobacter chroococcu...
1997). New interdisciplinary approaches are needed to improve the understanding of complex interactions bePrecision agriculture (PA) has recently been defined by the U.S. tween multiple factors affecting crop growth and farm National Research Council as a management strategy that uses information technologies to bring data from multiple sources to bear on decision making. Unbiased, systematic a...
phosphorus induces flowering and helps seed formation, but there is a big gap between phosphorus supply from natural sources and agriculture and industry demand. in order to investigate phosphorus feeding over long time from iran regions' apatites on rose plants characteristics, var. black magic in zeoponic culture, an experiment was conducted as factorial on the basis of completely random...
background: organic nitrates relax all kinds of smooth muscle , not only vascular smooth muscle , a fact that has allowed the use of these drugs to treat many different aliments. objective.-the purpuse of this study was to examine prosepectively benefical effects , if any, of sublingual nitroglycerin on the pain of renal colic. design.- prospective , randomised , double blind, placebo- contoled...
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