In the world of cereals, corn ranks third in terms of economic importance and cultivated area, following wheat and rice. It is also the top cereal crop in terms of total production. Due to its adaptability to various climatic conditions, corn cultivation has been expanding rapidly, making it one of the major crops in semi-tropical and tropical regions.

In Iran, corn was introduced as a new crop in 1349 with the establishment of the Corn and Forage Research Department at the Institute of Plant Breeding and Seed and Seedling Preparation. Through genetic and agronomic research, corn gained attention and became a significant crop. By the agricultural year 87-86, the cultivated area reached approximately 183,000 hectares, producing 9,250,000 tons of corn.

In the agricultural year 1401, a project was conducted in collaboration with the Agricultural Jihad of Alborz Province to investigate the impact of using organic liquid fertilizer “Zargreen” on agricultural products. Mr. Masoud Nozarian’s farm, located in Savojbolagh, was chosen as the pilot site for evaluating the effects of Zargreen on corn production. The farm covered three hectares for Timar with Zargreen and an additional two hectares for the Shahed group. Corn was sown in early August of 1401.

The Timar with Zargreen organic liquid fertilizer was done in three stages:
1. At the beginning of stem growth (when corn reached a height of 50 centimeters) with 40 liters per hectare of Zargreen.
2. At the beginning of tassel emergence with 40 liters per hectare of Zargreen.
3. During the ear filling stage with 40 liters per hectare of Zargreen.

In parallel with the corn harvest on 14th of Aban 1401, various traits such as plant height, plant weight, cob height, cob weight, and final yield were evaluated in both the Timar and Shahed fields. The results of the study are as follows:

– The average plant height in the Timar field was 234 centimeters, compared to 216 centimeters in the Shahed field (a 5.8% increase compared to the Shahed).
– The average plant weight in the Timar field was 711 grams, compared to 597 grams in the Shahed field (a 19% increase compared to the Shahed).
– The average cob height in the Timar field was 38 centimeters, compared to 33 centimeters in the Shahed field (a 14.3% increase compared to the Shahed).
– The average cob weight in the Timar field was 238 grams, compared to 185 grams in the Shahed field (a 28.1% increase compared to the Shahed).
– The final yield in the Timar field was 49 tons, compared to 41.2 tons in the Shahed field (a 19% increase in yield compared to the Shahed).