Effect of Split and Amount Application of Nitrogen Fertilizer to Sugarbeet on Root-Knot Nematode, Meloidogyne Javanica and Crop Production under Sprinkler Irrigation in Sandy Soil

• Maareg, M.F.; Sahar F. Tawfik And I.M.A.
• Gohar Sugar Crops Research Institute, ARC, Egypt.
• The Third International Conference onIPM Role in Integrated Crop management and Impacts on Environment and Agricultural Products. 26-29 November 2005, Giza, Egypt.

Abstract

Nubariya region. The aim of this investigation was to study the effect of splitting and levels of nitrogen fertilizer application under sprinkler irrigation in sandy soil in controlling of Meloidogyne javanica nematode infecting sugarbeet and the related consequences on yield and quality of the crop. Obtained results indicated that root yield, sugar yield, extractable sugar % and purity % were increased gradually and significantly with increasing nitrogen level from 67.0 up to 167.5 kg N/fed. but number of galls, larvae, females and eggmasses on sugarbeet root as well as final juvenile larvae of nematode in soil reduced as the level of nitrogen raised.

Splitting nitrogen application had a significant effect on extractable sugar %, root juice purity %, roots yield and sugar yield of sugarbeet as well as numbers of galls and developmental stages of root-knot nematode, M. javanica in sugarbeet root and soil. Application of nitrogen in five equal portions, significantly increased roots and sugar yields as well as extractable sugar % and purity of roots juice %, but galls number and developmental stages of nematode were significantly reduced compared with application in four or three or two equal portions application.

From these results, interaction of the two investigated factors , resulted in marked influence on roots and sugar yields as well as numbers of nematode's galls and eggmasses in root and juvenile larvae in sugarbeet soil. It could be concluded that application of 167.5 kg N/fed. as ammonium nitrate in five equal portions at 30, 45, 60, 75 and 90 days after sowing gave the highest increase in roots yield and sugar yield of sugarbeet as well as the highest reduction in nematode's galls and eggmasses in root and final juvenile larvae in sugarbeet sandy soil under sprinkler irrigation system. This exceeded the other treatments including systemic nematicide treatment (Fenamiphos 10 % granules at the rate of 10 kg/fed.). This information would allow producers to make more informative decisions regarding high performance of sugarbeet crop in the highly contaminated sandy soils by plant parasitic nematodes.