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- Title
EFFECT OF DEFICIT IRRIGATION, NITROGEN AND POTASSIUM FERTILIZATION ON SUGAR BEET PRODUCTIVITY IN SANDY SOILS.
- Authors
Makhlouf, B. S. I.; Abd EI-AII, A. E. A.
- Abstract
Two field experiments were carried out in a sandy soil in EI-Bostan area, Aly Mubark Experimental Farm, Southern EI-Tahrir region, (latitude of 30.57° N and longitude of 30.71° E), EI-Buhira Governorate, Egypt, during the two successive seasons of 2013/2014 and 2014/2015 to find out sufficient amount of irrigation water and the optima/levels of nitrogen and potassium fertilizers to get the highest yield and quality of sugar beet grown in a sandy soil under drip irrigation system conditions. A split plot design with three replications was used to lay out eighteen treatments, represented the combinations of three deficit irrigation regimes (applying irrigation water at 60%, 80% and 100% of the actual crop evapotranspiration "ETc"}, which occupied the main plots, whereas six combinations among three nitrogen fertilization levels (80, 100 and 120 kg Nlfed "0.42 ha-1") and two potassium levels (24 and 48 kg K20/fed) were distributed randomly in the sub-plots. Sugar beet Sara multi-germ variety was sown in both seasons. Results revealed that irrigating sugar beet at 80% ETc significantly increased root length and diameter, sucrose%, extractable sugar% (ES) and purity% in both seasons. However, applying water at 100% ETc significantly increased leaf area index (LA/), K and a-amino N contents in root as well as top, root and sugar yields/fed in both seasons. Increasing potassium fertilizer level to 48 kg K20/fed significantly increased all traits under study, except purity% significantly decreased, in both seasons, meanwhile the increment in ES% did not reach to the significant level in the 1st season. Root length and diameter, Na, K and α-amino N contents, LA/, top, root and sugar yields/fed were significantly increased by increasing nitrogen levels from 80 to 120 kg N/fed, whereas adding 100 kg N!fed gave the highest significant values of sucrose% and ES%, in both seasons. The combination between water regime at 80% ETc and 48 kgK20/fed gave ~ the highest averages of root length, sucrose% and ES%, in both seasons. The combination between water regime at 100% ETc and 48 kg K20/fed significantly increased root yields/fed in both seasons, as well as sugar yield/fed in the 1st one. The addition of water at 100% ETc with 120 kg N/fed significantly increased root diameter, LA/ and yields of top, root and sugar/fed jn both seasons. Sucrose%, ES% and purity% significantly increased by the appIication of water at 80% ETc and 100 kg N/fed in both seasons. The combination between 48 kg K20/fed and 100 kg Nlfed produced the highest significant values of sucrose% and ES%, in the 1st season. Water use efficiency (WUE) calculated on root and/or suger yield basis increased with decreasing the amount of applied irrigation water indicating that deficit irrigation regime is a good tool to increase WUE for sugar beet under drip irrigation condition in sandy soil. Based on the previous results, the application of irrigation water at 80% ETc with the addition of 48 kg K20/fed and 100 kg N/fed could be recommended to get the best quality, while the combination of 100%ETc, 48 kg K20/fed and 120 kg N/fed is recommended to get the highest yields of sugar beet ·grown in a sandy soil under drip irrigation at EI-Bostan, EI-Buhira Governorate.
- Subjects
CROP yields; SUGAR beets; DEFICIT irrigation; EFFECT of nitrogen fertilizers on plants; EFFECT of potassium fertilizers on plants; SANDY soils
- Publication
Menoufia Journal of Plant Production, 2017, Vol 2, p325
- ISSN
2357-0830
- Publication type
Article
- DOI
10.21608/mjppf.2017.125867