THINNING OF APPLE FLOWERS WITH POTASSIUM BICARBONATE (ARMICARB®) IN ORGANIC ORCHARD
Iwona Szot
University of Life Science in LublinAlina Basak
InHort in SkierniewiceTomasz Lipa
University of Life Science in LublinPaweł Krawiec
University of Life Science in LublinAbstract
Flower or fruit thinning is the most important technique in apple growing for improving fruit quality. In organic fruit production the use of chemical-synthetic thinning agents or plant hormones for crop regulation is forbidden. In Poland the Armicarb® is registered as a fungicide. Being a caustic chemical, Armicarb® damages petals, pistils and anthers and prevents fertilization. In 2013 and 2014 potassium bicarbonate was used twice at the doses 10 and 15 kg∙ha-1 on trees cv. ‘Braeburn Mariri Red’/M.9 T337. The first spraying was done at the beginning of flowering (BBCH 61) and the second at the full bloom (BBCH 65). Trees of cv. ‘Šampion’/M.9 T337 in 2014 were sprayed twice at BBCH 61 and 65 at the doses 10 and 15 kg∙ha-1, but in 2015 the single application was done. In 2014 and 2015 on trees cv. of ‘Gala Must’/M.9 only one spraying with potassium bicarbonate was done at doses: 10,15 and 20 kg∙ha-1. Thinning of apple flowers with Armicarb® caused a decrease in the yield, especially of cv. ‘Gala Must’ and ‘Šampion’. However in all cultivars the fruit size distribution was much better than in control. Each variety responded by clear increase in the fruit size after thinning with Armicarb®. Mean fruit mass, the diameter and length of apples after using Armicarb® at all doses were much bigger than in control. Skin of apples was severe russeted after application of Armicarb®. However skin russeting was also affected by the weather. In 2014, at cold temper-atures and high precipitation during the period of intensively fruit growth, the skin of apples was more russeted relative to others seasons.
Keywords:
crop regulation, fruit quality, yield, flower thinningReferences
Barbier, E. (1983). Le pommier. L’Arboric. Fruit., 30, 348, 32–36.
Bergh, O. (1985). Effect of the previous season’s crop on cell number of Malus domestica cv. Starking apple flower primordia, flowers and fruit. S. Afr. J. Plant Soil, 2, 4, 191–196.
Bergh, O. (1990). Effect of time of hand – thinning on apple fruit size. S. Afr. J. Plant Soil, 7, 1, 1–10.
Bound, S.A., Klein, J.D. (2010). Successful thinning of apple with an organosilicone surfactant. Acta Hort., 884, 413–417.
Bound, S.A., Wilson, S.J. (2004). Response of two apple cultivars to potassium thiosulfate as a blossom thinner. Acta Hort., 653, 73–79.
Fallahi, E., Fallahi, B. (2004). Comparison of new blossom thinners for apples under conditions of Intermountain West of the United States. Acta Hort., 636, 311–315.
Forshey, C.G., Elfving, D.C. (1977). Fruit number, fruit size and yield relationship in ‘McIntosh’ apples. J. Amer. Soc. Hort. Sci., 102, 4, 399–402.
Gautier, M. (1983). La pollination des arbres fruitiers. L’Arboric. Fruit., 30, 349, 29–36.
Goffinet, M.C., Robinson, T.L., Lakso, A.N. (1995). A comparison of ‘Empire’ apple fruit in unthinned and hand-thinned trees. J. Hort. Sci., 70, 375–387.
Granatstein, D., Kirby, E., Willer, H. (2013). Global area and trends of organic fruit production. Acta Hort., 1001, 383–394.
Irving, D.E., Pallesen, J.C., Drost, J.H. (1989). Preliminary results on chemical thinning of apple blossom with ammonium thiosulphate, NAA, and ethephon. New Zeal. J. Crop Hort. Sci., 17, 363–365.
Johnson, D.S. (1994). Influence of time of flower and fruit thinning on the firmness of ‘Cox Orange Pippin’ apples at harvest after storage. J. Hort. Sci., 69, 2, 197–203.
Kacal, E., Koyuncu, F. (2012). Use of chemical blossom thinners in ‘Jerseymac’ and ‘Jonagold’ apples. Bul. J. Agric. Sci., 18, 6, 898–904.
Krełkowska-Kułas, M. (1993). Badanie jakości produktów spożywczych. PWE Warszawa, 53–55.
Link, H. (2000). Significance of flower and fruit thinning on fruit quality. Plant Growth Reg., 31, 17–26.
Looney, N.E. (1993). Improving fruit size, appearance, and Rother effects of fruit crop „quality” with plant bioregulating chemicals. Acta Hort., 329, 120–127.
Mantinger, H. (1997). Eine optimal Befruchtung sichert qualitative hochwertge Ertrage. Obstbau Weinbau Fachblatt des Südtirolel Beratungsringes, 34, 3, 71–75.
Milić, B., Magazin, N., Keserović, Z., Dorić, M. (2011). Flower thinning of apple cultivar Braeburn using ammonium and potassium thiosulfate. Hort. Sci., 38, 3, 120–124.
Noé, N. (1996). ‘Golden Delicious’ apple fruit shape and russeting are affected by light conditions. Sci. Hort., 65, 2, 209–213.
Pearson, J.A., Robertson, R.N. (1953). The physiology of growth in apple fruits. IV Seasonal variation in cell size, nitrogen metabolism, and respiration in developing Granny Smith apple fruits. Austr. J. Biol. Sci., 6, 1–20.
Racsko, J., Soltesz, M., Szabo, Z., Nyeki, J. (2009). The physiological role of the seed-set on the flowering and fruit development in some tempera te fruit crops. J. Plant Rep. Biol., 1, 1, 33–42.
Siddiqui, S., Bangerth, F. (1995). Effect of pre-harvest application of calcium on flesh firmness and cell-wall composition of apples – influence of fruit size. J. Hort. Sci., 70, 263–269.
Skene, D.S. (1982). The development of russet, rough russet and cracks on the fruit of the apple Cox’s Orange Pippin during the course of season. J. Hort. Sci., 57, 2, 165–174.
Stopar, M. (2008). Vegetable oil emulsions, NaCl, CH3COOH and CaSx as organically accepta-ble apple blossom thinning compounds. Europ. J. Hort. Sci., 73, 2, 55–61.
Stopar, M. (2004). Thinning of flowers fruitlets in organic apple production. J. Fruit Ornam. Plant Res., 12, 77–83.
Tamm, L., Amsler, T., Schärer, H., Refard, M. (2006). In: Proceedings 12th International Confer-ence on Cultivation Techniques and Phytopathological Problems in organic Fruit Growing (ed. Fördergemeinschaft Ökologischer Obstbau e. V., Weinsberg, Germany), pp. 87–92
Tukey, R.B. (1970). Predicting the harvest size of ‘Barlett’ pear. Wash. State Univ. Ext. Pub. E. M., 3403, 1–7.
Weibel, F.P., Chevillat, V.S., Rios, E., Tschabold, J.L., Stadler, W. (2008). Fruit thinning in organic apple growing with optimized strategies including natural spray products an rope-device. Europ. J. Hort. Sci., 73, 4, 145–154.
Weibel, F.P., Daniel, C., Tamm, L., Willer, H. (2013). Development of organic fruit in Europe. Acta Hort., 1001, 19–34.
Weibel, F.P., Lemcke, B., Monzelio, U., Giordano, I., Kloss, B. (2012). Successful blossom thinning and crop load regulation for organic apple growing with potassium-bi-carbonate (Armicarb®): results of field experiments over 3 years with 11 cultivars. Europ. J. Hort. Sci., 77, 4, 145–153.
Yermakov, A.I., Arasimovic, V.V., Yarosh, N.P., Peruanskij, J.V., Lukovnikova, G.A., Ikonniko-va, M.I. (1987). Methods of biochemical analyses. Agropromizdat, Leningrad, 431.
University of Life Science in Lublin
InHort in Skierniewice
University of Life Science in Lublin
University of Life Science in Lublin
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