Nitrogen

Question 1

Nitrogen

Mobility in plant

Answer 1

Mobile

Older leaves affected first

Question 2

Nitrogen

Mobility in soil

Answer 2

Very mobile in soil, not attracted to soil particles, remains in water and is easily leached out of soils.

Question 3

Rôle of nitrogen

Answer 3

Constituent of chlorophyll atom.
Needed for photosynthesis.
Major component of amino acids, the building blocks of proteins.

Question 4

Nitrogen

Signs of deficiency

Answer 4

Weak, stunted growth.
Small, chlorotic  leaves.
Older leaves turn red and drop.
Build up on anthrocyanin causes red/purplish stem.
Decrease in number and size of fruit.

Question 5

Treatment of nitrogen deficiency

Answer 5

Sulphate of ammonia.

Question 6

Nitrogen deficiency

Causes

Answer 6

Most likely in clod/waterlogged, acid/highly alkaline soils and soils lacking organic matter.

Nitrifying bacteria are suppresses in theses soils.

Addition of too much carbon rich material can lead to nitrogen becoming ‘locked in’

Question 7

Nitrogen

Excess

Answer 7

Excess vegetative growth.
Floiable vulnerable to frost, disease and damage by predators.
Poor fruiting/root storage is poor.
New wood takes a long time to ripen