الفهرس Only 14 pages are availabe for public view
 |  | from | 319 |  |  |
| | | from | 319 | | |
Abstract
Field work of this investigation was carried out during the two successive seasons of 2001 and 2002 on six-year-old commercial shrubs of the Egyptian prickly pear type
(El- Shamy) grown in sandy soil at 3x4 meters apart, in Entelak district, Moudereyat Al- Tahrir Behera Governorate, Egypt
This study was planned to evaluate the effect of different nitrogen and potassium fertilization rates on vegetative growth, yield and physical and chemical fruit characteristics in an attempt to determine the fertilization regime of prickly pear plants grown in sandy soils.
The experimental shrubs of each treatment were of uniform size and vigour. In winter of 2001 season all plants were supplied with 10 kg of organic manure and 300g superphosphate per plant. The plants were sprinkler irrigated for one hour at fortnightly intervals throughout the flowering and fruit development periods (March-early July). The chosen shrubs were subjected to three separate experiments as follows:
The first experiment was conducted to evaluate different annual rates of nitrogen and potassium fertilization on the growth, yield and fruit characteristics. The experimental shrubs were subjected to the following N and K fertilization treatment.
1.Adding N fertilizer at 0, 24, 48, 72, 96, 120 g N per plant.
2. Adding K fertilizer at 0, 13, 26, 39 g K2O per plant.
3.Different combinations between N and K fertilizer.
All amounts of nitrogen and potassium fertilizer were added in two equal doses as a soil application, using ammonium sulphate (20.6% N) as a source of nitrogen and potassium sulphate (48 – 50 K2O) as a source of K. The first dose was applied just before the first irrigation (16 and early march) and the second at the end of the April (27 and 26 April) of each season, respectively.