WHAT IS SULFUR FERTILIZERS..METHODS OF USE

Sulfur is an essential nutrient for plant growth. In recent years, sulfur deficiencies have become more frequent and the importance of sulfur in crop production is becoming more and more recognized.

Although it is considered a secondary nutrient, it is now becoming recognized as the 'fourth macronutrient', along with nitrogen, phosphorus and potassium.

Oil crops, legumes, forages and some vegetable crops require sulfur in considerable amounts. In many crops, its amount in the plant is similar to phosphorus.

Roles of Sulfur in plants

Sulfur has various functions in plants. Some major roles are:

It is found in some amino acids, the building blocks of proteins. Most of the sulfur absorbed by plants, about 90%, is used for that purpose.

Sulfur is essential for chlorophyll formation. It is a major constituent of one of the enzymes required for the formation of the chlorophyll molecule.

Essential in the synthesis of oils, especially in oil crops.

Active in the metabolism of nitrogen.

Sulfur deficiencies

Sulfur deficiencies are more likely in sandy soils with low organic matter (less than 2%) and under high rainfall conditions. However, even in high organic matter soils, often, the breakdown of the organic matter and the mineralization process are not rapid enough to meet the sulfur requirement of the crop. When this occurs, fertilizers or amendments containing sulfur have to be applied.

Sulfur is immobile in plants and does not readily translocated from older leaves to young leaves. Therefore, sulfur deficiency first appears on younger leaves.

Sulfur deficiency symptoms show up as light green to yellowish color. Deficient plants are small and their growth is retarded.

Symptoms may vary between plant species. For example, in corn, sulfur deficiency shows up as interveinal chlorosis; in wheat, the whole plant becomes pale while the younger leaves are more chlorotic; in potatoes, spotting of leaves might occur.

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