EFFECT OF SOME FERTILIZATION TREATMENTS ON GROWTH OF TREES, PRODUCTIVITY AND QUALITY OF GUAVA (Psidium guajava l.) FRUITS CV. "ETMANI". I. UNDER THE CONVENTIONAL FLOOD IRRIGATION SYSTEM.

Abstract

A set of field experiments was conducted in a private orchard at Qalyob district, Qalubia governorate, Egypt during 2012, 2013 and 2014 seasons of 6-years-old uniform trees of guava (Psidium guajava L.) cv. Etmani grown on clay loam soil at 5 x 5 m apart and irrigated with the ordinary flood system to study the response of trees to organic compost at either full, ¾ or ½ the recommended dose (40, 30 and 20 kg/tree, respectively) + feldspar at either full, ¾, ½ or ¼ the recommended dose (1200, 900, 600 and 300 g/tree, respectively) + rock phosphate at either full, ¾, ½ or ¼ the recommended dose (1300, 975, 650 and 325 g/tree, respectively) + mixture of bisofertilizers (Nitropeine + phosphoreine + potasseine at 120, 25 g. and 134 cm./tree, respectively) in 12 combined treatments, besides the control.The obtained results indicated that all fertilization treatments used in this study caused a marked improvement in the means of shoot length, number of leaves/m, leaf area and number of flower buds/m with various significant differences as compared to means of control in the three seasons. A similar trend was also obtained regarding No. of fruits/m, fruit weight, length and diameter, fruit volume, yield and flesh thickness. The percent of TSS was increased in fruits of fertilized trees, while that of acidity was decreased in most cases of the three seasons. So, TSS/acidity ratio was often higher in fruits of treated trees than that in fruits of untreated ones. Moreover, vitamin C content in fruit flesh and fruit firmness were also increased. The leaf content of N, P, K, Ca and Mg was markedly improved as a result of applying fertilization combinations used in such investigation. However, the mastery in most previous parameters was for a combination of 100 % compost + 50 % feldspar + 50 % rock phosphate + bio-fertilizers mixture, which gave the best values in most cases of the three seasons. Accordingly, it can be recommended to fertilize the 6-years-old irrigated trees of guava cv. "Etmani" with the combination of 100 % compost + 50 % feldspar + 50 % rock phosphate plus mixture of biofertilizers to attain the highest growth, yield and fruit quality from commercial point of view.

Enhancing the Shelf Life of <i>Psidium guajava</i> during Post Harvesting storage by Coating with <i>Cinnamomum verum</i> Formulations

“…For the investigation, Guava (Psidium guajava L.) was obtained from a commercial market, in Bengaluru. Guava fruits with green-yellowish color at the stage of maturity were selected for the study 7 considering uniformity in size and free from mechanical damages or diseases.…”