PHYSIOLOGICAL DISORDERS IN CROPS

 Following physiological disorders are often observed in different crops. Symptoms of various

disorders, causal factors, and remedial measures for redressing different disorders are briefly discussed

below.

A. MANGO

1. Softnose fruits

2. Malformation of inflorescence

3. Blacktip of Fruits.

B. BANANA

1. Seediness (Kottaivazhai) in fruits

2. Goose flesh of fruits

3. Yellow pulp of fruits

4. Degrain of the bunch

5. Finger drop

C. GRAPES

Coulure in grapes

D. COCONUT

Crown chocking

E. GUAVA

Fatio disease

F. CITRUS

1. Die-Back

2. June Drop

3. Fruit Cracking

G. PINEAPPLE

Crook-Neck Disease

H. APPLE

1. Internal Bark Necrosis (=Apple Measles)

2. Bitter Pit

A detailed description of various physiological disorders and their corrective measures are

described in the following pages :

A. MANGO

1. Soft Nose Fruits

This disorder is caused due to excess N application of trees. In acid sandy soil, the incidence is

about 7% in trees receiving lower N levels and increases to 78% on trees receiving 10 times more N

fertilizer.

Remedy

Disorder reduced by maintaining higher Ca level in leaf (2.5%) by applying either

Calcium Nitrate or Gypsum or Lime Stone.

2. Malformation in Inflorescence:

Causes :

Malformation disorder increased in trees receiving either P and K or P alone.

Remedy

Application of N, P, and K in the ratio of 9:3:3 reduces the incidence of floral malformation

Comments

Post a Comment

Popular posts from this blog

Mechanism of Mineral uptake by Plants

Image
Previously, it was thought that the absorption of mineral salts from the soil took place along with the absorption of water, but it is now well established that the mineral salt absorption and water absorption are two independent processes. Mineral salts are absorbed from the soil solution in the form of ions. They are chiefly absorbed through the meristematic regions of the roots near tips. The plasma membrane of the root cells is not permeable to all the ions. It is selectively permeable. All the ions of the same salt are not absorbed in an equal rate but there is unequal absorption of ions. The first step in the absorption of mineral salts is by Ion Exchange. Once the nutrients come and adsorb on the surface of the walls of the membranes of root cells, then the further process of the absorption of mineral salts may be of two types. They are : 1. Passive Absorption 2. Active Absorption Various theories have been proposed to explain the mechanism of mineral salt absorption, which ca...
Read more