Physiological disorder

Damages of Blossom and rot in watermelon crop

In watermelon fruit sometimes deep rotten patches and a wrinkle-like structure is formed.
These are caused usually due to improper intervals of irrigation.
When the soil of the field becomes very dry, it fixes calcium in the soil, prohibiting the plants from absorbing it.
To prevent this, use calcium nitrate @ 10 kg/acre.

17/11/2018

This is a physiological response that occurs when tubers are exposed to light.
If plants in the field are not hilled properly so that the upper portions of tubers are exposed to light, these exposed portions will turn green.
If harvested potatoes are stored in the home under low levels of light, the tubers will turn pale green.
Tubers which turn green produce solanin chemical which imparts a bitter taste to the cooked potatoes.

Precautions –

Excessively green potatoes should not be consumed.
Greening can be prevented by hilling up around plants to prevent exposure to light.
Storing the harvested crop in the dark.
If the home storage area is not completely dark, provide dark by storing in paper bags to allow air movement.

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23/05/2018

Management of Leaf Reddening in Cotton:-

Adjustment of sowing time for enabling the crop to skip over the adverse environmental condition during boll development stage.
One or two sprays of urea (1 %) at appropriate times.
Application of magnesium sulphate (0.5%).
Adequate drainage to avoid waterlogging of the fields.
Leaf reddening incidence due to sucking pests may be overcome by spraying recommended insecticides.
Boll load management.
Supply of adequate nutrients during flowering and boll development particularly in hybrids.
Timely inter-culture and weeding operations and other agronomic practices.
Avoidance of susceptible cultivars.
Adequate irrigation if available.
Adoption of crop rotation and growing of intercrop to maintain the soil health and nutritional status.

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14/02/2018

Bulb splitting In Onion (physiological Disorder)

Causal:-

Uneven irrigation of onion fields increases the incidence of this disorder.
Fields that are over irrigated, allowed to dry completely and then over irrigated again often have many split bulbs.
Bulb mites are frequenty associated with bulb splitting.

Symptoms:-

The first symptom observed is the basal portion of bulb.
Secondary growth of the affected bulb often occurs when several small bulbs protruded from the spilt basal portion.

Control:-

Use uniform irrigation and fertilization practices to prevent phase of bulb spiltting.
Use of slow growth of the onion bulb varieties can reduces the incidence of this disorder.

09/02/2018

Bolting on onion (Physiological disorder)

Causal :-

Symptoms:-

When the plant reaches the five leaf stage critical stage of bolting takes place.
Under this condition bulbs become light and fibrous.
When the plant on put up a central stalk which develops a seed head, bolting take place.

Control:-

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