EFFECT OF DIFFERENT NITROGEN FERTILIZERS SOURCES ON ROOT NODULES FORMATION AND GROWTH OF Acacia salig NA LABILL SEEDLINGS IN SANDY SOIL. | ||
| Journal of Plant Production | ||
| Article 21, Volume 27, Issue 7, July 2002, Pages 4909-4922 PDF (1.54 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2002.255729 | ||
| Author | ||
| M. S. Shehata, | ||
| Forest. and Timber Trees Oep. Hart. Res. Instit. | ||
| Abstract | ||
| This study was conducted at the Horticulture nursery of Shark EI- Bohairate in Esmailia Governorate during two successive seasons of 199912000 and 2000-2001., Pots seedlings of Acacia saligna 3 months old were fertilized monthly at the first three months of planting with three different nitrogen sources namely: urea, ammonium sulphate and ammonium nitrate at three rates of 0.5 , 1.0 and 1.5 gm N for each I pot. The obtained results showed that different nitrogen fertilizers specially at low level of 0.5 gm encouraged Rhizobium root nodules formation as atmospheric nitrogen N2 fixation and produced a big size and heavy fresh and dry weight of Rhizobium nodules more than unfertilized plants and as the appllcalion rate of nitrogen fertilizers increased to 1.5 gm N. ,nodules formation decreased. Adding ammonium sulphate as a nitrogen carrier at low level of 0.5 gm N. promoted much more nodules formation than both forms of urea or ammonium nitrate. Nitrogen fertilizers sources enhanced all the vegetative growth parameters viz. height growth Increment, stem diameter, fresh and dry weight of shoots than unfertilized. Ammonium sulphate application at rate of 1 .. 0 gm N. resulted the best growth height ,stem diameter and fresh weight of shoots followed by the form of urea fertilizer and lastly coming ammonium nitrate, while ammonium nitrate produced the heaviest dry weight of shoots followed by ammonium sulphate. Increasing the levels of fertilizers to 1.5 gm N. reduced the growth. However it was rather than the control. Ammonium sulphate fertilizer increased the ratio of fresh and dry weight of shoots more than the two others and the form of ammonium nitrate reduced it. Different rates of nitrogen application had no effected nearly on the ratio of fresh and dry weight of shoots. Fertilizer efficiency of ammonium sulphate was greatly in fresh weight followed by urea then ammonium nitrate was the last. on the other hand ammonium nitrate efficiency surpassed in dry weight production followed by ammonium sulphate and lastly urea fertilizer. Chlorophyll a and b content in leaves did not affect due to different nitrogen fertilizers sources. However the seedlings fertilized had excessive values of chlorophyll a and b more than those unfertilized. Leave nitrogen content increased positively due to different rates of fertilizers application where as the application rate increased nitrogen content in leaves increased. Fertilized plants with ammonium SUlphate at low level of 0.5 gm N. raised up the percentage of nitrogen in leave more than the others carrier of nitrogen fertilizers, it may be due to that roots of Acacia sa/igna formed Rhizobium nodules that fixed the atmospheric N2 more than the other fertilizers It can be concluded from this study that there was synergetic effect between Rhizobiumm formation and nitrogen fertilization in amending the suitable nitrogenQus requirements for enhancing Acacia saligna growth specially in sandy soil Therefore it can be recommended that ammonium sulphate as nitrogen fertilizer at rate of 0.5 or 1.0 gm N. is suitable for Acacia sa/igna cultivated in sandy soil. | ||
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