Vegetative growth, fruit set, yield and fruit quality of "Le-Conte" pear grown under calcareous soil conditions as affected by different levels of nitrogen, phosphorus and potassium
Keywords:Pyrus communis, Vegetative Growth, Fruit Set, Yield, Quality, Calcareous Soil, Mineral Fertilization
"Le-Conte" pear fruiting trees grown in newly reclaimed soils were fertilized with different levels of nitrogen, phosphorus and potassium fertilization during three successive seasons of 2006, 2009 and 2010. However, results were calculated for the two seasons of 2009 and 2010. Tree vegetative growth (shoot length and diameter and leaf area), fruit set, yield increased significantly with increasing fertilization level. Fruit quality was increased significantly with increasing fertilization rate. The results also indicated that increasing N, P and K fertilization level lead to a gradual increment in leaf N, P and k content. Total sugars in fruits increased significantly with increasing the fertilization levels. On the other hand, starch decreased gradually with increasing the fertilization levels. The most effective level (650g. Ammonium nitrate + 325g. Potassium sulphate + 600g. Calcium superphosphate) leads to the highest vegetative growth, mineral leaf content, fruit yield and the best fruit quality as compared with other levels of fertilization. The lowest vegetative growth, yield and fruit weight and dimensions were recorded at the lowest level (250g. Ammonium nitrate + 125g. Potassium sulphate + 200g. Calcium superphosphate).
. Abo El-Maged, N. (1992). Effect of nitrogen, phosphorus and potassium on yield and fruit quality of persimmons. M.Sc. Thesis, Fac. Agric., Saba Bacha, Alex. Univ.
. Abou-Aziz, A.B., M.M. Nageib, M.R. El-Sonbaty and M.M. El-Tanahy (1987). Effect of potassium sulphate as soil application on yield and fruit qualities of pear trees. Al-Azhar J. Agric. Res., 8: 77-86.
. Brown, P.H. (1994). Seasonal Variations in Fig (Ficus carica L.) Leaf Nutrient Concentrations. HortScience, 29(8): 871–873 (Abstract).
. Bussi, C., J. Beset and T. Girard (2003). Effects of fertilizer rates and dates of application on apricot (cv Bergeron) cropping and pit burn. Scientia Hort., 98(2): 139-147.
. Chapman, H.D. and P.F. Pratt (1961). Methods of analysis for soils, plants and waters. Div. of Agric. Sci., Univ. of California, USA.
. Dimitrovski, T., A. Stojkovska, B. Ristevski and D. Cvetkovic (1972). The effect of NPK and irrigation on the vegetative growth, yield and quality of peaches. Jugoslovensko Vocarstvo 6(19/20): 599-609. (C.F. Hort. Abst. 43 (10): 6629).
. Erel, R., A. Dag, A. Ben-Gal., A. Schwartz and U. Yermiyahu (2008). Flowering and Fruit Set of Olive Trees in Response to Nitrogen, Phosphorus, and Potassium. J. Amer. Soc. Hort. Sci., 133: 639–647.
. Evenhuis, B and Waard, P.W.F. de (1980). Principles and practices in plant analysis. Royal Inst., Amsterdam Paper, 15: 152-163.
. Hudina, M. and F. Stampar (2002). Effect of phosphorus and potassium foliar fertilization on fruit quality of pears. Acta Hort., (ISHS) 594:487-493.
. Kassem, H.A.A. (1991). The effect of nitrogen, phosphorus and potassium fertilization on leaf and fruit mineral content, yield and fruit quality of Barkhor apple trees and physiological changes of the fruits during cold storage. PhD Thesis, Fac. Agric., Univ. of Alexandria.
. Krivoruchko, G.I. (1980). The relationship between nutrition level and the concentration of nutrient elements in apple and pear leaves. Khimiya v Sel' skom Khozyaistve 5: 22-24.
. Lindhard, P.H. and P. Hansen (1997). Effect of timing of nitrogen supply on growth, bud, flower and fruit development of young sour cherries (Prunus cerasus L.). Scientia Horticulturae, 69(3-4): 181-188.
. Lobit, P., P. Soing, M. Genard and R. Habib (2001). Effects of timing of nitrogen fertilization on shoot development in peach (Prunus persica) trees. Tree Physiol., 21(1):35-42.
. Magness, J.R. and G.F. Taylor (1925). An improved type of pressure tester for the determination of fruit maturity. U.S. Dept. Agric. Circ., PP. 350-358.
. Malik, C.P. and M.B. Singh (1980). Plant enzymology and histo-enzymology. A text Manual. Kalyani, Publishers, New Delhi.
. Marini, R.P. (2002). Growing Pears in Virginia: Mineral Nutrition. Virginia Cooperative Extension. Publication No. 422-017.
. Mikhael, G.B.Y. (2001). Effect of some agricultural treatments on growth and yield as related to alternate bearing of Japanese persimmon. PhD Thesis, Department of Horticulture, Faculty of Agriculture, Kafr El-Sheikh, Tanta University, Egypt.
. Mikhael, G.B.Y., G. Shaddad and A.S.M. Wally (2005). Effect of N, P and K fertilization levels on growth, yield and fruit quality of apricot “canino”. I. The effect on vegetative growth. 6th Arabian Conference for Horticulture, Ismailia, Egypt, 344-352.
. Neilsen, G.H., D. Neilsen, L.C. Herbert, and E.J. Hogue (2004). Response of apple to fertigation of N and K under conditions susceptible to the development of K deficiency. J. Amer. Soc. Hort. Sci., 129(1): 26–31 (Abstract).
. Neumann, D. and N.N. Neumann (1981). Investigations into mineral measuring of apple orchards grown with short grass mulch. Archiv fur Qartenfan, 29 (7): 331 – 341. (Soil and Fertilize., 45 (11): 11878).
. Radi, M, M. Mahrouz, A. Jaouad and M. Amiot (2003). Influence of mineral fertilization (NPK) on the quality of apricot fruit (cv. Canino). The effect of the mode of nitrogen supply. Agronomie, EDP Sciences, 23: 737-745.
. Sánchez, E.E. (2002). Nitrogen nutrition in pear orchards. Acta Hort., (ISHS) 596:653-657.
. Snell, F.D. and C.T. Snell (1967). Colorimetric method of analysis. D. Van Nostrand Company Inc. 551-552.
. Steel, R.G.D. and J.H. Torrie (1980). Principles and procedures of statistics. N.Y. 2nd Ed. McGraw Hill, N.Y., USA.
. Stiles, W.C. (1994). Alternative sources for foliar application of potassium to apple trees. 91st Annual Meeting of the Amer. Soc. for Hort. Sci. 7-10 August. Abstract No. 261 [HortScience, Vol. 29 (5):467].
. Sugar, D., T.L. Righetti, Enrique, E. Sanchez and H. Khemira (1992). Management of Nitrogen and Calcium in Pear Trees for Enhancement of Fruit Resistance to Postharvest Decay. HortTechnology, 2: 382-387.
. Wally, A.S.M. (1997). Effect of some chemical foliar spray on growth of Apricot “Canino” grafts. J. Agric. Sci. Mansoura Univ., 22(1): 3939-3947.
. Zayan, M.A., S. Zeerban, El-Sayed Morsy and G.B. Mikhael (1994). Effect of NPK fertilization on "Anna" apple trees growing in calcareous soil. I. Effect on vegetative growth and leaf mineral contents. J. Agric. Res. Tanta Univ., 20(4): 740-751.
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