Yara Crop Nutrition
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Agronomic Principles
Crop Characteristics
Potatoes produce a fibrous root system. These roots are at best no more than 24in long. Thus potatoes are shallow rooted compared to cereals for example, which can root to at least 47in depth. As a result, potatoes are often unable to exploit nutrients and soil moisture at depth within a soil profile.
While root growth occurs when soil temperatures are between 50 to 95˚F (10 to 35˚C), best, most active root development is at soil temperatures of between 59 and 68˚F (15 and 20˚C).
Leaf (haulm) growth occurs at temperatures of between 44.6 to 86˚F (7 to 30˚C) , but optimal growth is at around 68 to 77˚F (20 to 25˚C). Optimum temperatures for stolon growth are similar.
effects of soil temperature on root development
The potato tuber is an enlarged portion of the stolon. The initiation of this tuber is triggered by short day lengths (photoperiods), and involves growth hormones. The colder the soil temperature, the more rapid the initiation of tubers and the greater the number of tubers formed. The optimum soil temperature for tuber initiation is 59 to 68˚F (15 to 20˚C).
Under these conditions, the potato plant will have short stolons and shoots. Longer day lengths delay tuber initiation and favor the growth of the stolon and shoot. High temperatures also reduce tuber formation. Late varieties seem to be more sensitive to long day lengths or high temperature conditions.
Low nitrogen and high sucrose levels in the plant favor the formation of more tubers.
Once formed, tubers grow rapidly, reaching a maximum rate of up to 1,249 lb/ac/day in temperate climates. See figure below:
potato tuber growth rate, germany
Physiological Aging
By planting sprouted seed, crop growth can be advanced. The magnitude of this response and its effect on increasing crop yield is related to the physiological age of the seed at planting.
Starch molecules are hydrolyzed into smaller units known as---- Simple sugars.
Hope this helps<3
Answer:
Explanation:
The glucose used by the neurons for ATP production comes from:
a) Nutrients absorbed from digestion and glucose produced by the liver.
b)The breakdown of fat in adipose tissue and glycogen in muscle tissue.
c)Only Nutrients absorbed from digestion.
d)Only gluconeogenesis in the liver.
What can receptors detect?
a)Loss of homeostasis
b)Loss of homeostasis and a return to homeostasis.
c) A return to homeostasis.
d)Need for medical attention.
Which of the following is not a role of the skeletal system in maintenance of homeostasis?
a) Calcium Storage
b) Protection
c) Support
d) Phosphorous storage
What controls blood pressure in your body?
a) The hypothalamus
b) pituitary gland.
c) medulla oblongata
d) all of the above
What increases blood pressure?
a) Decreased heart rate.
b) Decreased blood vessel resistance
c) Increased blood volume
d) all of the above
What ends a hormonal response to increase blood pressure?
a) Low blood pressure
b) High blood pressure
c) A return to homeostasis.
d) Low blood pressure and a return to homeostasis
Answer:
B. Major types of fossil fuels: coal, oil and natural gas
Explanation:
<span>B- tree > insect > frog> snake> hawk
The food chains are represented by organisms interconnected by red arrows that point in the direction of the one that's eating. So, the relation that is explicit by the arrow is that the organism from where the arrow departs is eaten by the organism where the arrow is pointing towards to. So, the food chain that can be observed accurately in the food web is: the tree is eaten by the insect, the insect is eaten by the frog, the frog is eaten by the snake, and the snake is eaten by the hawk.
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