Tag Archives: NPK

The Effect of Adding Different Levels of Fertilizer Recommendations on some Morphological and Productive Traits of Cotton (Var: Aleppo 118) in Aleppo Governorate

Hanan El-Haj Omar1*, Aziza Ajouri1, Abdulghany Al-khalidi2, Ahmad Jumaa2, and Bader El-Dien Jalab3

1Dept. of Soil Science and Land Reclamation, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.
2Cotton Research Administration, General Community for Scientific Agriculture Research, Aleppo, Syria.
3Resources Research Administration, General Community for Scientific Agriculture Research, Aleppo, Syria.

(*Corresponding author: Hanan El-Haj Omar, E-Mail :hanan.gcsar77@gmail.com).

Received: 13/ 07/ 2025                 Accepted: 7/ 09/ 2025

Abstract: 

Many industrial crops are grown in Syria, and cotton is the most important of these crops, as it is grown for its fibers and oil is extracted from its seeds, in addition to its importance as fodder and the use of its remains as firewood for heating. Because it is an irrigated crop and its growth period is relatively long, it is necessary to determine the fertilizer requirements of (NPK). Therefore, a field experiment was carried out at the Tal Hadya Research Station in Aleppo during the 2022 and 2023 seasons with the aim of studying the effect of adding different levels of fertilizer recommendations on some morphological and production indicators of the cotton variety /Aleppo 118/ irrigated by drip irrigation. The experiment included 6 treatments depending on the fertilizer recommendation (75, 100% of the fertilizer recommendation for cotton from NPK elements, and 50, 75, 125% of the fertilizer recommendation for nitrogen with 100% for P and K elements, in addition to the control without fertilization). The results showed a decrease in the number of vegetative branches because of the nitrogen percentage being lower than 100% of the fertilizer recommendation. Reducing nitrogen to 50% also negatively affected the average number of fruiting branches, plant height, and the weight of nuts. While increasing the nitrogen percentage above the fertilizer recommendation was not effective in increasing the number of fruiting branches, plant height, and the weight of nuts. While the yield decreased when reducing the nitrogen or all elements to 75% of the fertilizer recommendation, a significant decrease was observed when reducing the nitrogen amount only to half, indicating that the current fertilizer recommendation is appropriate.

Keywords: Cotton, Productive traits, NPK, Fertilizer recommendation, Drip irrigation, Aleppo 118.

Full paper in Arabic: pdf

Effect of NPK Fertilization on the Productivity of Black Seed and Nutritional Balance Determination by Applying Diagnosis and Recommendation Integrated System (DRIS)

Abd Al-ghani Khurshid(1) Wasem Adla(2) Ahmad Kattaa(3) and Obaydah AlKatib*(1)

(1). Department of Soil and Land Reclamation, Faculty of Agriculture, University of Aleppo

(2). Natural Resources Research Administration, General Commission for Agriculture Research GCSAR, Damascus, Syria.

(3). Department of Horticulture, Faculty of Agriculture, University of Aleppo, Aleppo, Syria.

(*Corresponding author : Eng. Obaydah AlKatib. E-Mail: obaydah123456@gmail.com).

Received: 18/03/2018                                Accepted: 12/05/2018

Abstract

A field experiment was conducted at the Agricultural Scientific Research Center in Hama (Syria) during 2015/2016 season to study the effect of adding levels of nitrogen, phosphorus and potassium on the production of black seed according to the experimental design of complete randomized block design, with three replicates. With the addition of nitrogen levels 0-60-120 kg N/ha in the form of urea (46% N) and phosphorus levels 0-30-60 kg P2O5 /ha in the form of triple superphosphate (46% P2O5) and potassium levels 0-30-60 kg K2O/ha, in order to study and diagnose the nutritional status of black seed crop and determine the data of the integrated diagnostic system (DRIS). The DRIS data of the black seed crop was identified in the Syrian Arab Republic for the first time depending on the content of NPK in the leaves after 90 days of sowing according to the laws of Beaufils and Sumner. As well as to study of the effect of NPK factors on seed production of black seed (kg/ha). The results showed that there is a clear correlation between DRIS indicators and the physiological equilibrium of the three elements (NPK) in the leaves on the one hand, and with the seed production on the other hand. The best physiological equilibrium of (NPK) paralyzed with N120P30K30 treatment (1630 kg/ha), which were statistically similar with N120P30K60, that gave the highest yield (1609 kg/ha). The standard values ​​of black bean plant were determined by n/p, n/k and k/p (6.19, 1.40 and 4.47) respectively.

Key words: NPK, Diagnosis and recommendation integrated system DRIS, Black seed.

Full paper in Arabic: PDF