Geries, L., Marey, R., Morsy, M. (2011). GROWTH, YIELD AND STORABILITY OF ONION AS INFLUENCED BY POTASSIUM FERTILIZER APPLICATION TIME AND UREA AS FOLIAR SPRAY. Journal of Plant Production, 2(8), 1073-1090. doi: 10.21608/jpp.2011.85639
L. S. M. Geries; R. A. Marey; M. G. Morsy. "GROWTH, YIELD AND STORABILITY OF ONION AS INFLUENCED BY POTASSIUM FERTILIZER APPLICATION TIME AND UREA AS FOLIAR SPRAY". Journal of Plant Production, 2, 8, 2011, 1073-1090. doi: 10.21608/jpp.2011.85639
Geries, L., Marey, R., Morsy, M. (2011). 'GROWTH, YIELD AND STORABILITY OF ONION AS INFLUENCED BY POTASSIUM FERTILIZER APPLICATION TIME AND UREA AS FOLIAR SPRAY', Journal of Plant Production, 2(8), pp. 1073-1090. doi: 10.21608/jpp.2011.85639
Geries, L., Marey, R., Morsy, M. GROWTH, YIELD AND STORABILITY OF ONION AS INFLUENCED BY POTASSIUM FERTILIZER APPLICATION TIME AND UREA AS FOLIAR SPRAY. Journal of Plant Production, 2011; 2(8): 1073-1090. doi: 10.21608/jpp.2011.85639
GROWTH, YIELD AND STORABILITY OF ONION AS INFLUENCED BY POTASSIUM FERTILIZER APPLICATION TIME AND UREA AS FOLIAR SPRAY
Onion Res. Dept., Field Crops Res. Inst., Agric. Res. Center, Giza, Egypt.
Abstract
This experiment was carried out for two seasons in 2007/2008 and 2008/2009 at the Experimental Farm of Sakha Agricultural Research Station, ARC, Kafr El-Sheikh, Gevernorate, Egypt. The objective of this experiment was to study the effect of four times of potassium application i.e., 100% before transplanting (BT), 50% BT + 50% at 30 days after transplanting (DAT), 50% K at BT + 50% K at 60 DAT and 50% K at 30 DAT + 50% K at 60 DAT. Three urea rates as foliar spray i.e. 2, 4, and 6 g/l on vegetative growth at 90 and 120 DAT, yield and yield components, quality and storability of onion. The main important findings were as follows:
1- Plant height, bulbing ratio, plant fresh weight and plant dry weight recorded maximum mean values by adding 50% of potassium fertilizer at 30 DAT and 50% at 60 DAT at two growth stages in both seasons, except for plant height at 120 DAT in the first season and bulbing ratio at 90 DAT in both seasons.
2- Adding 50% of potassium at 30 DAT and 50% at 60 DAT attained the highest average of bulb weight, marketable yield/fed., culls yield/fed. and total yield/fed. While, adding 50% of potassium before transplanting and 50% at 60 DAT attained the lowest ones in both seasons.
3- Increasing urea rate as foliar spray from 2 to 4 or 6 g/l significantly increased mean values of plant height, plant fresh weight and plant dry weight at two growth stages, in both seasons.
4- Spraying onion plants with 6 g/l of urea attained of average bulb weight, marketable yield/fed., culls yield/fed. and total yield/fed. While spraying onion plants with 2 g/l gave lowest ones of all studied characters, except for culls yield/fed. in the second season.
5- Results showed that highest percentages of TSS% and dry matter% were obtained by adding 50% of potassium before transplanting and 50% at 60 DAT, while the smallest ones were obtained by adding 50% of potassium at 30 DAT and 50% at 60 DAT in both seasons.
6- Increasing urea as foliar spray rate from 2 g/l to 4 or 6 g/l decreased mean values of TSS% and dry matter % in both seasons.
7- Results indicated that highest average of bulb weight, marketable yield/fed. and total yield/fed. were achieved by adding 50% of potassium at 30 DAT and 50% at 60 DAT when plants were sprayed with 6 g/l of urea in both seasons.
It could be concluded that adding 50% of potassium at 30 DAT and 50% at 60 DAT and spraying onion plants with 6 g/l of urea.could be recommended for optimum onion yield per unit area.
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