لخّصلي

خدمة تلخيص النصوص العربية أونلاين،قم بتلخيص نصوصك بضغطة واحدة من خلال هذه الخدمة

نتيجة التلخيص (50%)

For centuries, farmers have realized the need to
maintain soil fertility to sustain or improve crop
yields. By accident or by trial and error, it was found
that applications of various organic wastes or naturally occurring mineral substances, such as manure,
compost, fish remains, ashes, saltpeter, and other
materials, would sometimes increase crop yields or
apparently restore the fertility of the land.
The history of the production and use of
inorganic fertilizer can be traced back to the nineteenth century when Justus von Liebig established
the theoretical foundations of agricultural science
and when John Bennett Lawes began producing
fertilizers containing phosphorus (Smil, 1997). As
the science of chemistry progressed and more and
more chemical elements were discovered, the
relative importance of various elements for plant
growth and yield was identified. The German
scientist Liebig recognized the value of elements
derived from the soil in plant nutrition and correctly
deduced the necessity of replacing those elements in
the soil to maintain soil fertility. Liebig is usually
credited with initiating the fertilizer industry. In 1840
Liebig published a recommendation that pulverized
animal bones be treated with sulfuric acid to make
the phosphate more readily available to plants. This
practice was accepted, and production of fertilizers
by chemical processing began in the 1840s.
Fertilizers provide plants with nutrients needed
for growth and development. Plants grow and
reproduce by utilizing nutrients, water, and carbon
dioxide from the air, and energy from the sun. While
carbon, hydrogen, and oxygen, which collectively
make up 90%–95% of the dry matter of all plants,
are provided by the atmosphere, other essential
nutrients are derived from the soil. These nutrients
are classified as primary nutrients (nitrogen, phosphorus, and potassium) and secondary nutrients
(calcium, magnesium, and sulfur). Plants also need
micronutrients (boron, chlorine, copper, iron, manganese, molybdenum, and zinc) in much smaller
amounts.
Nutrients taken up by crops must be replenished to maintain soil fertility and productivity and
prevent land degradation. The use of fertilizer to
replenish these nutrients results in many benefits to
man and the environment, including:
• Increased agricultural outputs (mainly food and
fiber).
• Increased water-holding capacity.
• Biological nitrogen fixation.
• Improved soil erosion control.
• Less extensive land use.
• Reserving lands marginally suitable for agriculture
for other uses.
Commercial fertilizers usually contain at least
one of the primary plant nutrients in a form that is
assimilable or “available” to plants. This includes
compounds that are water soluble or soluble in
special solutions that are used to estimate availability
to plants such as citric acid, neutral ammonium
citrate, or alkaline ammonium citrate. With nitrogen
fertilizers, slow release may be very desirable from
an environmental and efficiency standpoint.
Fertilizer products are customarily designated
by a series of numbers to express the grade of the
fertilizer product. Each of the numbers indicates the
amount of a nutrient contained in the fertilizer
product. This number includes only the amount of
nutrient present in a form that is available for plant
nutrition. The content of each nutrient is the guaranteed minimum rather than actual amount, which is
usually slightly higher. Three numbers are usually
used when expressing the grade of a fertilizer
product. These numbers always refer in order to the
2
content of the primary nutrients: nitrogen, phosphorus, and potassium. If any other nutrient is present,
an additional number is given, followed by the
chemical symbol of the nutrient it represents. Most
countries indicate the content of phosphorus and
potassium in oxide forms, P2O5 and K2O. Therefore,
a fertilizer product with a grade of 12-6-22-2MgO is
guaranteed by the manufacturer to contain a minimum of 12% N, 6% P2O5, 22% K2O, and 2% MgO.
Some common fertilizers and common grades are
given in the following table.


النص الأصلي

For centuries, farmers have realized the need to
maintain soil fertility to sustain or improve crop
yields. By accident or by trial and error, it was found
that applications of various organic wastes or naturally occurring mineral substances, such as manure,
compost, fish remains, ashes, saltpeter, and other
materials, would sometimes increase crop yields or
apparently restore the fertility of the land.
The history of the production and use of
inorganic fertilizer can be traced back to the nineteenth century when Justus von Liebig established
the theoretical foundations of agricultural science
and when John Bennett Lawes began producing
fertilizers containing phosphorus (Smil, 1997). As
the science of chemistry progressed and more and
more chemical elements were discovered, the
relative importance of various elements for plant
growth and yield was identified. The German
scientist Liebig recognized the value of elements
derived from the soil in plant nutrition and correctly
deduced the necessity of replacing those elements in
the soil to maintain soil fertility. Liebig is usually
credited with initiating the fertilizer industry. In 1840
Liebig published a recommendation that pulverized
animal bones be treated with sulfuric acid to make
the phosphate more readily available to plants. This
practice was accepted, and production of fertilizers
by chemical processing began in the 1840s.
Fertilizers provide plants with nutrients needed
for growth and development. Plants grow and
reproduce by utilizing nutrients, water, and carbon
dioxide from the air, and energy from the sun. While
carbon, hydrogen, and oxygen, which collectively
make up 90%–95% of the dry matter of all plants,
are provided by the atmosphere, other essential
nutrients are derived from the soil. These nutrients
are classified as primary nutrients (nitrogen, phosphorus, and potassium) and secondary nutrients
(calcium, magnesium, and sulfur). Plants also need
micronutrients (boron, chlorine, copper, iron, manganese, molybdenum, and zinc) in much smaller
amounts.
Nutrients taken up by crops must be replenished to maintain soil fertility and productivity and
prevent land degradation. The use of fertilizer to
replenish these nutrients results in many benefits to
man and the environment, including:
• Increased agricultural outputs (mainly food and
fiber).
• Increased water-holding capacity.
• Biological nitrogen fixation.
• Improved soil erosion control.
• Less extensive land use.
• Reserving lands marginally suitable for agriculture
for other uses.
Commercial fertilizers usually contain at least
one of the primary plant nutrients in a form that is
assimilable or “available” to plants. This includes
compounds that are water soluble or soluble in
special solutions that are used to estimate availability
to plants such as citric acid, neutral ammonium
citrate, or alkaline ammonium citrate. With nitrogen
fertilizers, slow release may be very desirable from
an environmental and efficiency standpoint.
Fertilizer products are customarily designated
by a series of numbers to express the grade of the
fertilizer product. Each of the numbers indicates the
amount of a nutrient contained in the fertilizer
product. This number includes only the amount of
nutrient present in a form that is available for plant
nutrition. The content of each nutrient is the guaranteed minimum rather than actual amount, which is
usually slightly higher. Three numbers are usually
used when expressing the grade of a fertilizer
product. These numbers always refer in order to the
2
content of the primary nutrients: nitrogen, phosphorus, and potassium. If any other nutrient is present,
an additional number is given, followed by the
chemical symbol of the nutrient it represents. Most
countries indicate the content of phosphorus and
potassium in oxide forms, P2O5 and K2O. Therefore,
a fertilizer product with a grade of 12-6-22-2MgO is
guaranteed by the manufacturer to contain a minimum of 12% N, 6% P2O5, 22% K2O, and 2% MgO.
Some common fertilizers and common grades are
given in the following table.

تلخيص النصوص العربية والإنجليزية أونلاين

تلخيص النصوص آلياً

تلخيص النصوص العربية والإنجليزية اليا باستخدام الخوارزميات الإحصائية وترتيب وأهمية الجمل في النص

تحميل التلخيص

يمكنك تحميل ناتج التلخيص بأكثر من صيغة متوفرة مثل PDF أو ملفات Word أو حتي نصوص عادية

رابط دائم

يمكنك مشاركة رابط التلخيص بسهولة حيث يحتفظ الموقع بالتلخيص لإمكانية الإطلاع عليه في أي وقت ومن أي جهاز ماعدا الملخصات الخاصة

مميزات أخري

نعمل علي العديد من الإضافات والمميزات لتسهيل عملية التلخيص وتحسينها


آخر التلخيصات

ما مدى تأثير مو...

ما مدى تأثير مواقع التواصل الاجتماعي على الاتصال الأسري عند المراهق؟ ويتفرع عن السؤال الرئيسي الأسئل...

لذا ظهرت الحاجة...

لذا ظهرت الحاجة إلى القانون للحد من حريات الأفراد، وإزالة ما فيها من تعارض، وللتوفيق بين مصالحهم، وذ...

TLRs contain a ...

TLRs contain a conserved TIR domain with regions of varying homology. The tyrosine located in the bo...

يجب توفير عدد ك...

يجب توفير عدد كاف من الحالات المتعلقة بالتغذية وتلبية الاحتياجات الطبية. أيضا ، يمكن أن يكون العميل...

تواجه العديد من...

تواجه العديد من الحيوانات في أدغال إفريقيا خطر الانقراض بسبب عوامل طبيعية كالجفاف أو التلوث البيئي ا...

تعد المراة جزءا...

تعد المراة جزءا لاينفصل بأي حال من الأحوال لانها مكون رئيسي للمجتمع بل تتعدى ذلك لتكون الأهم بين كل ...

Abstract This s...

Abstract This study exposes the spatial contradictory of scales and fields of living level for the w...

2 ائعة في المحا...

2 ائعة في المحافظة على الو ر ت واغتنام الفرص. فهذا ً لقد ضرب لنا عظماء الرجال أمثالا اء الكبرى ابن خ...

bstract—The Int...

bstract—The Internet of Things (IoT) is stepping out of itsinfancy into full maturity and establishi...

التقييم النفسي ...

التقييم النفسي الاجتماعي: مراجعة الشخص: الحالة الاقتصادية الخلفية العرقية والثقافية ، الوضع المعيشي ...

يعتبر أدب الرحل...

يعتبر أدب الرحلات واحداً من أجمل أنواع الآداب، إذ انه يعكس ويوثق كل ما صادف الرحالة عبر رحلاته كلها،...

Inelastic Suppl...

Inelastic Supply of labor: The supply of labor is inelastic in a country at a particular time. It me...