EFFECT OF BIO-FERTILIZER NITROBEIN AND MINERAL NITROGEN FERTILIZER LEVELS ON GROWTH AND PRODUCTIVITY OF SWEET POTATO PLANT | ||||
| Journal of Plant Production | ||||
| Article 21, Volume 27, Issue 10, October 2002, Page 6961-6972 PDF (3.68 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.256579 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Safaa A. A. Mansour, | ||||
| Potato and Vegetative Propagated vegetables Dept. Hort .Res .Inst ., A.R.C. | ||||
| Abstract | ||||
| Two field experiments were conducted during 1997 and 1998 seasons at the Hort. Res Farm of Seds, Beniswef Govrenorate to investigate the effect of partially substituting of N fertilizer with the biofertilizer nitrobein on growth, yield and chemical constituents of two sweet potato cultivars (Mabrouka and South Africa). Each cultivar received four treatments including the control one, 30.75 kg N/fed{100%N). The other three treatments included soil inoculation with the biofertilizer Nitrobein combined with N fertilizer at rates of 23.06{75%N), 15.38{50%N) and 7.69{25%N) kg N/fed. The biofertilizer (Nitrobein) was supplied at the rate of 7kg/fed. Results showed that, cv. Mabrouka had longer vine length and higher fresh weight of foliage per plant than South Africa during 1998.0n the other hand, South Africa showed greater leaf area than Mabrouka during 1997.Moreover, data indicated that 50 and 25 % of N+ Nitrobein resulted in lower DWT% of leaves as compared with the control treatment (1 OO%N). Concerning total yield of tuber roots, no significant difference was observed between the two cultivars in 1997. While in 1998 cv. Mabrouka exceeded South Africa by about 39%.Results also showed that applying N!trobein with 50 and 25% of N fertilizer gave the highest yield as compared with the control during the two growing seasons. They exceeded it by 12.6 and 10.8% during (1997) season and by 24.2 and 26.7% during 1998 season, respectively. No significant differences were observed in the marketable yield between the two cvs. during the two growing seasons. Data also showed that 75% followed by 50%of N+ Nitrobein gave the highest values of marketable yield as compared with the control treatment (100%N).The lowest marketable yield during the two growing seasons was always given by the treatment 25% N+ Nitrobein. Differences in average tuber root weight (g), DWT% and shape index of the tuber root were significant only during the second season. Mabrouka cv. had the highest of shape index of the tuber root. Also, it was obvious that 50%N+ Nitrobein resulted in the highest average weight of tuber root .On the other hand, the highest shape index and DWT % values resulted from 25% N+ Nitrobein . Mabrouka showed higher percentages of N, P, K, protein and sugars than South Africa. However, fertilizer treatments had no influence on N, P and protein percentages of tuber roots. Potassium % was higher in tuber root received 50 or 25 %N+ Nitrobein as compared with control (100 % N). On the other hand, plants received 100 %N without Nitrobein produced tuber roots with 15.3 % and 11.4% sugar contents higher than those treated with 50 and 25 % of the recommend amount of nitrogen, respectively. | ||||
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