Effect of Different Nitrogen and Potassium Fertilization Levels on Carrot Productivity

Fatma A. H.  Mohamed; Hasan Bendres Al-Baba; Abdullah Ateeq Meelad; Sharifa Nasr Abdulhamid

المؤلفون

Fatma A. H. Mohamed Horticulture Department Faculty of Agriculture, Omar AL-Mukhtar University, El Beida, Libya
Hasan Bendres Al-Baba Plant production Deportment, Agriculture Faculty, University of Kufra, AL-Kufra, Libya
Abdullah Ateeq Meelad Agronomy Department, Agriculture Faculty, University of Sirte, Sirte, Libya
Sharifa Nasr Abdulhamid Plant production Deportment, Agriculture Faculty, University of Kufra, AL-Kufra, Libya

الكلمات المفتاحية:

Carrot، potassium، nitrogen

الملخص

Two field experiments were conducted in a sandy soil at Al-Kufra City, Libya, during the two successive winter seasons of 2021and 2022, to study the effects of varying nitrogen and potassium fertilization levels, as well as their interaction, on yield and its components, chemical composition, and overall quality of carrot (Nantaise Amelioree) variety. Data cleared that that nitrogen fertilizer levels treatments have significant effect on yield and its components i.e., total yield, root weight and xylem/phloem, chemical composition i.e., N, K and chlorophylls content in the plant and quality parameters i.e., root dry weight and total soluble sugar percentages, in both seasons. The highest significant values for these traits were recorded as a result of increasing nitrogen fertilizer levels from 0 to 210 kg/ha regularly in both seasons. In relation to the impact of potassium fertilizer levels treatments, reveal significant effects on yield and its components, chemical composition and quality parameters, in the two seasons. It is evident that the highest values were achieved as a result of increasing the potassium fertilization levels from 0 to 180 kg/ha regularly in both seasons, with the exception of root weight in the first growing season. Plants fertilized at a rate of (60-120 kg/ha) outperformed those fertilized at a rate of (180 kg/ha). As for the interaction among nitrogen and potassium fertilizer levels treatments have significant effects for all studied qualities, in both seasons. The most effective combined treatment, which resulted in the highest significant increase, was achieved by applying the highest nitrogen rate (210 kg/ha) along with the highest potassium rate (180 kg/ha).