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(A) The mobility of elements is a crucial concept in plant nutrition. Elements that are actively mobilized within the plant,such as $N$,$P$,$K$,and $M

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It helps in identifying the type of fertilizer needed.

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(A) The mobility of elements is a crucial concept in plant nutrition. Elements that are actively mobilized within the plant,such as $N$,$P$,$K$,and $Mg$,are transported from older,senescing leaves to younger,developing leaves when their supply is deficient. Consequently,deficiency symptoms for these mobile elements appear first in older leaves. Conversely,elements that are relatively immobile,such as $Ca$ and $S$,do not move from older to younger tissues,so their deficiency symptoms appear first in younger leaves. In agriculture and horticulture,this knowledge allows farmers and gardeners to diagnose nutrient deficiencies by observing which leaves (older vs. younger) are affected,enabling them to apply the correct fertilizers specifically tailored to the plant's needs.

It is observed that the deficiency of a particular element shows its symptoms initially in older leaves and then in younger leaves. How is the aspect of mobility of elements important to horticulture and agriculture?

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