Two field experiments were carried out during 2016 and 2017 consecutive seasons at a Private Farm at Mit-Ghamr Distrect, Dakahlia Governorate, Egypt, to study the effect of humic acid rates (0.0, 325.60, 651.2 and 976.80 g/fad.), NPK fertilization rates [0.0, 25, 50, 75 and 100% of the recommended rate (RR)] and their interactions on growth, leaves and herb yield and some chemical constituents as well as active ingredients of stevia plants. The obtained results referred that the maximum value for each of plant height, branch and leaf number/plant, total dry weight/plant, dry weight of leaves and herb/fad., total N, P, K and total sugar percentages as well as total chlorophyll content (a+b) were detected when plants were applied with the highest rate of humic acid (976.80 g/fad.) and fertilized with 75% RR of NPK, in most cases. The main constituents of Stevia rebaudiana leaves as detected by high performance liquid chromatography-mass spectrometry (LC-MS) were Rebaudioside A, Rebaudioside B, Rebaudioside C, Dulcoside and Steviolbioside which increased with treatment of 100% RR of NPK fertilizers combined with the highest rate of humic acid (976.80 g/fad.) compared to control.
Mohammed, M., Meawad, A., El-Mogy, E., & Abdelkader, M. (2019). GROWTH, YIELD COMPONENTS AND CHEMICAL CONSTITUENTS OF Stevia rebaudiana Bert. AS AFFECTED BY HUMIC ACID AND NPK FERTILIZATION RATES. Zagazig Journal of Agricultural Research, 46(1), 13-26. doi: 10.21608/zjar.2019.40172
MLA
Mona H.M. Mohammed; A. A.A. Meawad; E. E.A.M. El-Mogy; M. .A.I. Abdelkader. "GROWTH, YIELD COMPONENTS AND CHEMICAL CONSTITUENTS OF Stevia rebaudiana Bert. AS AFFECTED BY HUMIC ACID AND NPK FERTILIZATION RATES". Zagazig Journal of Agricultural Research, 46, 1, 2019, 13-26. doi: 10.21608/zjar.2019.40172
HARVARD
Mohammed, M., Meawad, A., El-Mogy, E., Abdelkader, M. (2019). 'GROWTH, YIELD COMPONENTS AND CHEMICAL CONSTITUENTS OF Stevia rebaudiana Bert. AS AFFECTED BY HUMIC ACID AND NPK FERTILIZATION RATES', Zagazig Journal of Agricultural Research, 46(1), pp. 13-26. doi: 10.21608/zjar.2019.40172
VANCOUVER
Mohammed, M., Meawad, A., El-Mogy, E., Abdelkader, M. GROWTH, YIELD COMPONENTS AND CHEMICAL CONSTITUENTS OF Stevia rebaudiana Bert. AS AFFECTED BY HUMIC ACID AND NPK FERTILIZATION RATES. Zagazig Journal of Agricultural Research, 2019; 46(1): 13-26. doi: 10.21608/zjar.2019.40172
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