Answers
Related Questions
define fertility management
Answers
Answer:
Soil fertility refers to the ability of soil to sustain agricultural plant growth, i.e. to provide plant habitat and result in sustained and consistent yields of high quality.
Advancing food security and environmental sustainability in farming systems requires an integrated soil fertility management approach that maximizes crop production while minimizing the mining of soil nutrient reserves and the degradation of the physical and chemical properties of soil that can lead to land degradation, including soil erosion. Such soil fertility management practices include the use of fertilizers, organic inputs, crop rotation with legumes and the use of improved germplasm, combined with the knowledge on how to adapt these practices to local conditions.
The Joint FAO/IAEA Division assists Member States in developing and adopting nuclear-based technologies for improving soil fertility practices, thereby supporting the intensification of crop production and the preservation of natural resources.
Different approaches to efficiently manage soil fertility
An integrated soil fertility management aims at maximizing the efficiency of the agronomic use of nutrients and improving crop productivity. This can be achieved through the use of grain legumes, which enhance soil fertility through biological nitrogen fixation, and the application of chemical fertilizers.
Whether grown as pulses for grain, as green manure, as pastures or as the tree components of agro-forestry systems, a key value of leguminous crops lies in their ability to fix atmospheric nitrogen, which helps reduce the use of commercial nitrogen fertilizer and enhances soil fertility. Nitrogen-fixing legumes are the basis for sustainable farming systems that incorporate integrated nutrient management. Use of nitrogen-15 lends understanding of the dynamics and interactions between various pools in agricultural systems, including nitrogen fixation by legumes and utilization of soil and fertilizer nitrogen by crops, both in sole and mixed cropping systems.
Soil fertility can be further improved by incorporating cover crops that add organic matter to the soil, which leads to improved soil structure and promotes a healthy, fertile soil; by using green manure or growing legumes to fix nitrogen from the air through the process of biological nitrogen fixation; by micro-dose fertilizer applications, to replenish losses through plant uptake and other processes; and by minimizing losses through leaching below the crop rooting zone by improved water and nutrient application.
The contribution of nuclear and isotopic techniques
The isotopes of nitrogen-15 and phosphorous-32 are used to trace the movements of labelled nitrogen and phosphorous fertilizers in soils, crops and water, providing quantitative data on the efficiency of use, movement, residual effects and transformation of these fertilizers. Such information is valuable in the design of improved fertilizer application strategies. The nitrogen-15 isotopic technique is also used to quantify the amount of nitrogen fixed from the atmosphere through biological nitrogen fixation by leguminous crops.
The carbon-13 isotope signature helps quantify crop residue incorporation for soil stabilization and fertility enhancement. This technique can also assess the effects of conservation measures, such as crop residue incorporation on soil moisture and soil quality. This information allows the identification of the origin and relative contribution of different types of crops to soil organic matter.
Question 2 (2 points)
How have new technologies helped scientists determine the age of Earth?
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Answer:
Radioisotopic dating as a new technology has really helped to determine the age of the earth.
Explanation:
The actual age of the earth has been a subject of wanton speculation among different groups of people. Speculations arise from religious, cultural and philosophical perspectives.
However, studies using many radioactive isotopes believed to be present from the origin of the Earth and having extremely long half lives have been most helpful in determining the age of the earth. Radioisotopic dating is a common technique used to determine the age of ancient artifacts. It has shed a great light on the possible age of the earth.
Hence the application of radioisotopic dating as a new technology has really helped to determine the age of the earth.
how are the mississippi and amazon rivers differ? Check all that apply a- The Amazon acts as more of a barrier to movement b- The Amazon is much harder to get to c- The Amazon is surrounded by farmland d- the amazon has more industry around it Thanks!!
Answers
Answer:
A-The Amazon acts as more of a barrier to movement
b- The Amazon is much harder to get to
c- The Amazon is surrounded by farmlands
Explanation:
The Amazon river has surroundings which are largely underdeveloped with large amount of plant life. They also inhabit lots of animal life too.The surroundings are hard to get to due to poor road network.
The Mississippi River however is found in a more developed industrial area and lacks a dense plant population with good road networks.
Answer:
A-The Amazon acts as more of a barrier to movement
b- The Amazon is much harder to get to
c- The Amazon is surrounded by farmlands
Explanation:
The Amazon river has surroundings which are largely underdeveloped with large amount of plant life. They also inhabit lots of animal life too.The surroundings are hard to get to due to poor road network.
The Mississippi River however is found in a more developed industrial area and lacks a dense plant population with good road networks.
The paragraph above describes the kangaroos rats ?
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Answer:
A
Explanation:
It's explaining it's habitat and surroundings
Answer:
what they said
Explanation:
Question 7 of 40
Which of the following best describes a natural resource? As
A. Currency used to exchange for or purchase products
B. A cultural or religious ideology used by humans
C. Products created by humans for improved living conditions
D. A substance, energy source, or organism used by humans
SUBMIT
Answers
Answer:
D. A substance, energy source, or organism used by humans
Explanation:
Its not man made like the others
What are some examples of possibilism today?
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Answer:
hope this helps
Explanation:
The Green revolution, Invention of fertilizers and pesticides, the modern irrigation methods and the organic farming methods have also contributed to the high output of crops and other products related to agriculture to meet the high food demands across the world.
A thrust fault increases the thickness of the crust as it moves toward a continental interior in a mountain belt; yet the crust beyond the mountain front stays the same thickness. Isostasy would suggest that the area at the mountain front, where the thrust emerges, should ________ over time.
Answers
Answer:
subside
Explanation:
Isostasy is a geographical term which describes the condition of gravitational equilibrium that exists within the Earth's crust and mantle, there by, making the crust stays above a heights that relies on its physical attributes, such as thickness and density.
In Isostasy, its occurrence process involves principles of buoyancy in which an Earth crust apply stress on the less stronger mantle, such that for over a geological time moves laterally in a way that the load is contained by height adjustments.
Hence, Isostasy would suggest that the area at the mountain front, where the thrust emerges, should SUBSIDE over time.
Day and night are equal in equator. Why?
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Answer:
The reason we on Earth have equinoxes at all is because the Earth's axis is tilted. ... Earth's axial tilt also means that our planet's equator is tilted relative to the plane of its orbit around the Sun – what astronomers call the “plane of the ecliptic”.
Explanation:
As the sun rays fall straight and two halves of the earth can be made through equator,it represents the equal effect on both parts so,day and night are equal in equator.
Keep smiling and hope u r satisfied with my answer.Have a good day :)
Qué semejanzas y diferencias reconoces entre las civilizaciones americanas (Mayas, Aztecas e Incas) y el pueblo Mapuche, previo a la conquista de los europeos? *
Answers
This is English Brainly, You can ask questions in Spanish Brainly
Es Brainly en Ingles, Puedes pedir preguntas en Brainly en Espanol.
If Earth did not experience the greenhouse effect, Choose one: the temperature of Earth would be much cooler. Earth would not receive as much radiation from the Sun. the temperature of Earth would be the same. there would be more liquid water.
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Answer:
The temperature of Earth would be much cooler
Explanation:
The greenhouse effect is earths atmosphere being polluted by gasses that prevent heat from escaping as easily causing earth's temperature to rise and if that didnt exist earth would probably be alot cooler.
what is the capital of nigeria?
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Answer:
Abuja
Explanation:
The capital of Nigeria is Abuja! :) Lagos was the capital of Nigeria until 1991 when it was moved to the city of Abuja.
what is extrusive rock
Answers
Answer:
Here's your answer
Explanation:
Extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth’s surface. By contrast, intrusive rocks are formed from magma that was forced into older rocks at depth within Earth’s crust; the molten material then slowly solidifies below Earth’s surface, where it may later be exposed through erosion. Extrusive rocks are usually distinguished from intrusive rocks on the basis of their texture and mineral composition.
Answer:
Extrusive rock, any rock derived from magma (molten silicate material) that was poured out or ejected at Earth's surface
Explanation:
Between which longitudes does the region experience daytime?
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Answer:
Mostly between the 90 Degree East and West longitudes
Explanation:
Because Earth has tilt of over 23.5 degree The day and night time differs according to its revolutions.
between 90 degree of east west lingtitude
Look at the map. Which answer best describes the income level of Central America?
A. Mainly upper-middle income
B. Mainly high income
C. Mainly low income
D. Mainly lower-middle income
Answers
Answer:
B
Explanation:
dark blue all over the continent
Answer:
Mainly lower-middle income
Explanation:
centra america is the littel bit between mexico and south america
the correct answer is the yellow one.
How does climate change impact on the Forests of the Blue Mountains and Sumatra?
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Answer:
More intense and frequent bushfires due to climate change threaten the world heritage values of the Greater Blue Mountains World Heritage Area. “Climate change will increase temperatures and lead to more wildfires.
1) what are tectonic plates ? How it is formed ? please my humble request please mark me Brainlist Thank you !!
Answers
Answer:
the things that form the earths crust they are formed by rock
Explanation:
hope this helps
What is the biome with the richest abundance of life?
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Answer:
The richest abundance of life is found within the equatorial forest biome.
This biome is located in the equatorial region:
with a large number of animals and plants species; the forest is formed by several layers (at the base are grasses, algae, ferns, trees under 10 m and 25-35 m and the trees up to 50 m).the rubber tree, the cocoa tree, the coffee tree, banana trees;different animals.HELPPP!! giving brainliest
What are the weather patterns in a Mediterranean type of climate?
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Why is the water colder on the southwest coast of the United States, yet the northeast coast has warmer water?
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Answer:
Because of climate change and how close things are to the equator
Explanation:
five examples of internal and external layers of the structure of the earth {5marks}
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Answer:
5 examples of internal structure of the earth are:
1) Crust.
2) Upper Mantle.
3) Lower Mantle.
4) Outer Core.
5) Inner Core.
5 examples of external structures of the earth are:
1) Exosphere.
2) Thermosphere.
3) Mesosphere.
4) Stratosphere.
5) Troposphere.
Think about the African countries you've
heard of. List as many of these countries as you can.
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Answer:
South Africa, Kenya, Ethiopia, Tanzania, Uganda, Nigeria, Sudan, Morocco, Malawi, Rwanda, Cameroon
Approximately how far back in time does the fossil record extend? Approximately how far back in time does the fossil record extend? 3.5 billion years 5.0 million years 5.0 billion years 3.5 million years
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Answer:
A : 3.5 billion years ago
Approximately about 3.5 billion years ago the fossil record extend. The reason the correct option is a.
According to radiometric dating, Earth formed around 4.5 billion years ago. The oldest fossils, which are found in rocks older than 3.5 billion years (see Precambrian epoch), resemble creatures like bacteria and cyanobacteria (blue-green algae). The so-called Ediacara fauna, which consists of small, soft-bodied wormlike organisms, is where the oldest animal fossils, dating back roughly 700 million years, may be found. In rocks that are around 540 million years old, there are many fossils with mineralized skeletons that belong to several living phyla.
The oldest fossils date back between 3.48 and 4.1 billion years. A geological timescale and the relative ages of various fossils were recognised in the 19th century as a result of the discovery that specific fossils were linked to specific rock strata.
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Solve for x: 2 ( x+5 ) = 0
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Answer:
x=-5
Explanation:
Answer:
x = -5
Explanation:
Distribute 2 to the parentheses:
2(x + 5) = 0
2x + 10 = 0
Subtract 10 from both sides:
2x = -10
x = -5
What is the approximate longitude of mainland Africa’s westernmost point?
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It is the section of the city of Dakar in the country Senegal.
Which of the following is NOT native to Australia?
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Answer: A, C and D
Explanation:
The correct answer is (D), sheep. Didgeridoos and boomerangs are artifacts invented by Australian Aborigines . Koalas evolved in Australia, and to this day are only found in the wild in Australia. In contrast, sheep were first domesticated in ancient Mesopotamia and then brought by humans to other parts of the world. The first sheep were brought to Australia by ship, from the Cape of Good Hope in 1788.
Answer:sheep Explanation:
Which statements accurately describe soil? Check all that apply.
1)Soil condition directly affects crop growth.
2)Soil is used faster than it is replaced.
3)Soil cannot be replaced in a short time.
4)The amount of soil on Earth is unlimited.
5)The destruction of soil can take just minutes.
Answer is 1,2,3,5
Answers
Answer:
1, 2, 3, and 5 are the correct answers.
The correct statements are that-
Soil condition directly affects the crop growth.Soil is used faster than it is replaced.The soil cannot be replaced in a short time.The destruction of soil can take just minutes.The correct set of options that match the statements above are as under 1, 2, 3 and 5.
Soil
If the soil is infertile, there will be poor or no growth of crops. If the soil condition is healthy, the crop growth will be good. The soil replacement takes place gradually over a period of time due to natural events like wind, rain, etc. The amount of soil on Earth is limited at a given point of time. Due to deforestation, the amount of soil is also getting reduced. Destruction of soil can happen due to natural calamities like landslides, earthquakes, etc.Hence, the statements as under 1, 2, 3 and 5 are correct about the characteristics of soil.
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Without the North Atlantic Drift, which of the following statements about Scandinavia’s climate would be true?
A.
It would have much warmer temperatures and less rain.
B.
It would have much warmer temperatures and more rain.
C.
It would have much lower temperatures and more rain.
D.
It would have much lower temperatures and less rain.
Answers
Answer:
B.
Explanation:
The warm waters moderate the weather so its not as cold as it should considering its latitude. Also when the atmosphere is warmer it can hold more moisture adding to rainfall.
Answer:
Yes the answe is B
Explanation:
What’s the value of y = -2x + 4
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Answer:
(y/2)-2=x
Explanation:
y=-2x+4
y-4=2x
(y-4)/2=x
(y/2)-2=x
Explain how landscapes have economic value. In your answer refer to the image below and your own knowledge. Remember to write your paragraph using TEEL.
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Answer:
Landscapes have economic value because the owners of the land or the area have many visitors coming and going and they can put up shops etc to get money
Explanation:
Of the total energy intercepted at Earth's surface and available for work, only about ________ is actually fixed by photosynthesis. Of the total energy intercepted at Earth's surface and available for work, only about ________ is actually fixed by photosynthesis. a) 1% b) 5% c) 10% d) 15%
Answers
Answer:
a) 1%
Explanation:
The ecosystem is the self-sustaining attachment of living plants and animals and their non-physical environment Sugar and by-products in combination with water and light are oxygenated by photosynthesis Co2. The overall growth of a plant is based on pure photosynthesis, which is the difference between photosynthesis and respiratory damage. The amount of pure photosynthesis depends on environmental factors such as light, water, temperature, soil fertility and regulation of plant space, height and competition from other plants and animals. Solar energy enters the ecosystem through photosynthesis and dissolves thermal energy from the system in several stages. Of the total energy available for work on the earth's surface and only 1% is determined by photosynthesis as chemical energy (energy stored as carbohydrates in plants).