RESPONSE OF SUGAR BEET TO LEVELS AND TIMES OF POTASSIUM FERTILIZATION UNDER SALINITY CONDITIONS AT NORTHERN DELTA OF EGYPT. | ||
| Journal of Plant Production | ||
| Article 5, Volume 27, Issue 11, November 2002, Pages 7237-7246 PDF (12.04 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2002.257026 | ||
| Authors | ||
| A. A. Kandil,; M. H. EL-Hindi; A. M. Said; Y. I. Gomaa | ||
| Agronomy Dept., Faculty of Agric., Mansoura University. | ||
| Abstract | ||
| Two field experiments were performed in a saline clay soil at EL-Hamoul Center, Kafr EL-Sheikh Governorate during two successive seasons of 1998199 and 199912000 to study the effect of potassium fertilization levels and its application times on growth, yield and yield components as well as quality of sugar beet (Beta vulgaris, L.) cv Pelleno.The experiments were laid-out in a split plot design with four replicates. Each experiment included sixty treatments comprising four K- fertilization levels (12, 24. 36 and 48 kg K20/fad) and four K-application times i.e.1I2, 213, 1/3 of every K- level before the first irrigation and the remaining splits were applied before the second irrigation. while. in the fourth treatment, potassium was splitted into three equal portions applied before the first, second and third irrigations, respectively. Potassium Obtained results can be summarized as follows: Combined analysis of data collected after 120 and 150 days from planting in the two seasons revealed that K-Ievels affected both fresh and dry weights of sugar beet roots, foliage fresh weight, both root length and root diameter (em), foliage length(em), leaf area index (LAI), crop growth rate (CGR) in g/day. Relevant results showed, also, that K levels affected other growth variables under study such as relevant growth rate (RGR) and net assimiltion rate (NAR),however, the differences failed to reach the level of significance at 5%. As far as limes of K- application was concerned, combined analysis of data for the two seasons revealed that most of growth characters were not significantly affected by this factor . However, potassium fertilizer levels splitted into two equal portions or into two thirds and one third applied before the first and second irrigations, respectively, seemed to be ,in general, more favourable under conditions of the current study. Likwise, the interactions between potassium fertilization levels and potassium application times did not induce clear effects on the averages of most characters except leaf area index (LAI) since the highest means were recorded due 10 K-Ievel of 36 or 48 kg K20lfad applied as 2/3+ 1/3 or 112+112 before the first and second irrigations, respectively. With regard 10 both root and top yields(Vfad) as well as sugar yield (Ufad), it was noted that incremental doses of K-application favoured these variables upto 36 kg K20/fad .Increasing K20 level upto 48 kg K20 /fad did not exhibit signficant increases as far as that these characters were concemed since higher concentrations of Na" could replace K+, in part, for uptake by sugar beet plants under such soil circumstances of the present study. It is worthy to note, also, that neither levels of K-fertilization nor times of it, application affected significantly total soluble solids (TSS), sucrose % and apparent . purity % in any of the two seasons and combined analysis ,as well. | ||
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