لینک کوتاه : https://en.magicfile.ir/?p=2916
دانلود تحقیق آماده در مورد علف های هرز قالب فایل پاورپوینت
Dear friends, we have prepared for you a research about weeds in PowerPoint format and beautiful slides, it is also editable and printable, you can easily change it
مشخصات تحقیق آماده در مورد علف های هرز به شرح زیر می باشد :
- عنوان تحقیق : علف های هـرز
- فرمت فایل : PowerPoint (.ppt)
- قابلیت ویرایش : دارد
- چاپ : بدون مشکل در پرینت گرفتن
- تعداد اسلاید :40
اسکرین شات اسلاید های این تحقیق آماده در مورد علف های هـرز
قسمتی از متن انتخاب شده از داخل فایل پاورپوینتی :
Weeds are plants that appear in agricultural environments, gardens, parks, roads, and other human living environments in an unwanted and unacceptable manner, and with high growth intensity, they can reduce the yield and quality of plant products, increase production and labor costs. , and also possible risks for the health of humans and animals. In this research, we will introduce some types of weeds, their control and prevention methods.
انواع علفهای هرز
1. برگ بو
Bo leaf is a plant that grows widely in gardens, parks, fields and roads. This plant has deep roots that can penetrate to a depth of centimeters in the soil and cause a decrease in the yield of plant products.
2. چاودار
Rye is a weed that grows in gardens, fields and roadsides. This plant has deep roots that can penetrate to a depth of centimeters in the soil and cause a decrease in the yield of plant products.
و ...
مقدمه :
امروزه علف های هرز از جمله مسائل و مشکلاتی است که کشاورزان سراسر دنیا با آن دست به گریبان
Are. Weeds are usually dispersed and propagated by plant seeds, birds, animals and wind.
Most weeds are not dangerous, and some of them can be controlled by good husbandry, which is necessary for economic production of crops.
Weeds are considered as an integral part of agricultural and non-agricultural ecosystems and one of the most important factors that reduce agricultural products, so that the problems of these plants have occupied millions of farmers and thousands of researchers. According to some researchers, the damage of weeds to crops can range from 10 to 100 percent, and if these plants are not properly controlled or managed, their damage to agricultural products can be more than pests and diseases.
Out of 250,000 known plant species, about 250 species (0.1%) are weeds, of which 76 species are among the most harmful weeds in the world. These 76 species belong to 30 plant families, about half of which belong to the Poaceae and Asteraceae families.
Although the problem of weeds and their control has a long history in our country, it was considered as a side activity until recent decades. The greater recognition of the role of weeds in reducing production has caused more attention to be paid to the recognition and control of these plants in recent years. So that today the efforts of some of our farmers to control weeds are based on scientific methods that are common in developed countries. .
On the other hand, the environmental problems caused by the indiscriminate use of herbicides have caused special attention to be paid to the knowledge of the biology and ecology of these plants in relation to the control of weeds.
In order to arrive at a comprehensive opinion on the problem of weeds, an accurate knowledge of the weed flora is essential, in fact the nature of the weed flora largely determines the timing and method of control. Therefore, identification and estimation of the weed population of each region is considered as a basic requirement for adopting an effective method in the implementation of control programs.
Identifying the weed flora of an area, in addition to its role in the management of these plants, can also be important in the field of medicinal and pasture uses of these plants.
تعریف علف های هرز :
In general, weed is an unwanted, harmful and damaging plant that interferes with agricultural operations, which causes the highest labor cost and increases the cost of production and reduces the yield of agricultural products.
می دهد. این گونه از گیاهان را به عنوان علف می شناسیم.
A weed is not a special and specific plant that is inherently a weed, but is called a weed because it is completely unusable and the damage caused by it is completely unwanted.
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