What is the effect of deficiency in nitrogen?

Answer 1

A light red cast can also be seen on the veins and petioles. Under nitrogen deficiency, the older mature leaves gradually change from their normal characteristic green appearance to a much paler green. As the deficiency progresses these older leaves become uniformly yellow (chlorotic). Leaves approach a yellowish white color under extreme deficiency. The young leaves at the top of the plant maintain a green but paler color and tend to become smaller in size. Branching is reduced in nitrogen deficient plants resulting in short, spindly plants. The yellowing in nitrogen deficiency is uniform over the entire leaf including the veins. However in some instances, an interveinal necrosis replaces the chlorosis commonly found in many plants. In some plants the underside of the leaves and/or the petioles and midribs develop traces of a reddish or purple color. In some plants this coloration can be quite bright. As the deficiency progresses, the older leaves also show more of a tendency to wilt under mild water stress and become senescent much earlier than usual. Recovery of deficient plants to applied nitrogen is immediate (days) and spectacular.

Answer 2

I'm assuming that by leaking nutrients you mean the plant is loosing nutrients through the roots rather than absobing them. if this is the case then the root system is damaged or dying, in this case the plant will exhibit sysmptoms similar to that of overwatering - the progressive yellowing of the leaves and stems from the base of the plant upwards, and possibly even wilting if the temperature is to warm

Answer 3

If a plant doesn't have enough nitrates it will be stunted and have yellow, older looking leaves

Answer 4

Stunted growth causing lower yeild, chlorotic(yellow) leaves generally starting at the bottom of the plant and working upwards, stems can also be yellow depending on the type of plant.