Hanafy Ahmed,, A., Bekhit, R., Abdel-Aziz, M. (2004). EFFECT OF DIFFERENT NPK FERTIGATION LEVELS ON GROWTH, YIELD AND NITRATE ACCUMULATION OF SWEET PEPPER PLANTS GROW1NG IN PLASTIC GREENHOUSE. Journal of Plant Production, 29(5), 2483-2511. doi: 10.21608/jpp.2004.238632
A. H. Hanafy Ahmed,; R. S. Bekhit; M. E. Abdel-Aziz. "EFFECT OF DIFFERENT NPK FERTIGATION LEVELS ON GROWTH, YIELD AND NITRATE ACCUMULATION OF SWEET PEPPER PLANTS GROW1NG IN PLASTIC GREENHOUSE". Journal of Plant Production, 29, 5, 2004, 2483-2511. doi: 10.21608/jpp.2004.238632
Hanafy Ahmed,, A., Bekhit, R., Abdel-Aziz, M. (2004). 'EFFECT OF DIFFERENT NPK FERTIGATION LEVELS ON GROWTH, YIELD AND NITRATE ACCUMULATION OF SWEET PEPPER PLANTS GROW1NG IN PLASTIC GREENHOUSE', Journal of Plant Production, 29(5), pp. 2483-2511. doi: 10.21608/jpp.2004.238632
Hanafy Ahmed,, A., Bekhit, R., Abdel-Aziz, M. EFFECT OF DIFFERENT NPK FERTIGATION LEVELS ON GROWTH, YIELD AND NITRATE ACCUMULATION OF SWEET PEPPER PLANTS GROW1NG IN PLASTIC GREENHOUSE. Journal of Plant Production, 2004; 29(5): 2483-2511. doi: 10.21608/jpp.2004.238632
EFFECT OF DIFFERENT NPK FERTIGATION LEVELS ON GROWTH, YIELD AND NITRATE ACCUMULATION OF SWEET PEPPER PLANTS GROW1NG IN PLASTIC GREENHOUSE
1Agriculture Botany Dept., Fac, of Agric., Cairo unlv, Giza, Egypt.
2Vegetable Crops Dept., Fac. of Agrlc" Cairo Unlv, Giza, Egypt.
Abstract
This experiment was carried out during the two successive seasons of 1999- 2000 and 2000-2001 in the unheated plastic house of the Vegetable Crops Department, Faculty of Agriculture, Cairo University. Transplants for sweet pepper (Capsicum annuum L. cv. Bruyo hybrid) were arranged In 3 replicates using split-plot design. The treatment of preplanting NPK soil addition was stablished in the main plots and 5 NPK fertigation levels in the sub-main. Generally, it can be observed that plant hleght and total leaf area showed higher Significant increases with the third fertigation level (100kg. NH~N~+ SOkg H,pO~+ 60kg K2S0~/plastic house, 540 m'). Meanwhile, number of leaves as well as dry weights of roots, stems and leaves recorded the highest significant increases with the fifth fertigation level (1 SOkg NH"N03+ 75kg H3PO~ + 90kg ~S04) in both seasons. In addition, the third fertigation level showed higher significant increases for early and total yield except, early yield In the second season. Also, concentrations of N and Fe showed significant increases by fifth fertigation level in leaves tissue. Furthermore, the same fertigalion level combined with preplanting NPK soil addition increased significantly concentration of Pb in leaves. Howeover, no constant trend could be detected in Ni concentrations between treatments. As regard fruit quality; fruit length, width and size as well as ascorbic acid no signifICant differences among treatments were recorded. However, total acidity and total soluble solids were increased significantly with increasing fertigation level in both seasons. Also, fruits tissue showed higher concentrations for N, P and K by NPK preplanting soil addition combined with the fifth fertigation level. Furthermore, fruit concentration of Fe and Zn recorded significant increases by increasing fertigation levels. In addition, preplanting NPK soil addition combined with the fifth fertigation level showed the lowest value of Pb concentration in fruits tissue. Moreover, concentration of Ni showed no significant differences among treatments. Furthermore, nitrate concentration was increased significantly by increasing fertigation levels, vice versa for total sugars. However, the concentrations of Pb and nitrate accumulation in sweet pepper fruit still less than the critical limits permitted to be found for human consumption.
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