ESTIMATION OF NITROGEN REQUIREMENTS FOR POTATO CROP IN SANDY SOILS OF SAUDI ARABIA | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 6, Volume 27, Issue 9, September 2002, Page 6493-6503 PDF (915.71 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2002.255370 | ||||
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| Authors | ||||
| F. M. Alromlan; Y. M. EI-Fakhrani | ||||
| Department of So" and Water, College of Agriculture and Veterinary Medicine, King Saud University, AI-Qasslm Branch, Buraydah, P. O. Box 1482, Saudi Arabia | ||||
| Abstract | ||||
| Two field experiments were carried out during winter seasons of 2000-2001 and 2001-2002 to estimate the optimum N level for growth. yield and quality parameters of potato plants grown on sandy soils under drip irrigation system and arid conditions of central region of Saudi Arabia. Five N levels of 0, 100, 200. 300 and 400 Kg N ha" were tested. The results Indicated thai the fresh and dry matter yields of shoots and tubers as well as the total carbohydrate yield in tuber dry matter significantly Increased in form of a quadratic equaUon curve with increasing of N fertilization rales. The highest fresh and dry maller yields of shOots and tubers as well as the tctal carbohydrate yield in tuber dry matter were obtalned as calculated average N application rate of aboul255 Kg N ha' using the second ploynomial equations in both seasons. While the optimum economic level of N fertilizalion for growth . yield and lotal carbohydrate yield was observed at 100 and 200 Kg N ha" (as average. 150 Kg N ha") at the two seasons. Shoot and tuber content of N was signlficafltly increased. while P and K content insignfficanlty increased with N application rales. On the other hand. Shoot and tuber N. P and K uptake by potato plants was significantly increased with increasing N fertilization levels. Soil salinity (ECe) was insignificantly increased with increasing N fertlli2atlon rate. while soil pH was slightly decreased. Available soil N was significantly increa8ed with Increasing N application rate. However. increasing N fertilization rate has slight effect on the available soil P and K. | ||||
| Keywords | ||||
| N fertilization. shoot and tuber Yields of potato plants; lolal carbohydrate yield. nutrient content; soil chemical properties | ||||
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