Effect of Using Bio and Mineral Fertilizers on Growth, Yield and Fruit Quality of Guava Cv. Seedy Montkhab

Document Type : Original Article

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Horticulture research institute, A.R.C., Egypt

Abstract

This work was conducted during 2007 &2008 growing seasons on selected seedy guava trees (12 years old) grown in sandy soil in El-Maamoura zone in private farm. To study effect of mineral and bio nitrogen fertilizers comparing to traditional nitrogen fertilization on growth, flowering, fruit set %, productivity and leaf and fruit mineral, total carbohydrates content and leaf total chlorophyll. Data revealed that T3 (2¼ kg amonium Sulphate + 1 kg super phosphate + 2 kg potassium Sulphate + 150 gm nutrobine) significantly increased number of new shoots in both seasons of study while T2 (3 kg amonium Sulphate + 1kg super phosphate + 2 kg potassium Sulphate + 75 gm nutrobine), T3 (2¼ kg amonium Sulphate + 1 kg super
phosphate + 2 kg potassium Sulphate + 150 gm nutrobine) T4 (1.5 kg amonium Sulphate + 1 kg super phosphate + 2 kg potassium Sulphate + 225 gm nutrobine) significant increased in average shoot length ,leaf total chlorophyll, number of flowers, number of fruits and fruit set %in both seasons of study compared with control. T4 gave the best result in yield of both seasons of study. T3, T4 and T5 (¾ kg amonium Sulphate + 1 kg super phosphate + 2 kg potassium Sulphate + 300 gm nutrobine) increased fruit weight in first season only, while all treatments did not effected the fruit length, width and firmness in both seasons of study T3, T4 improved pulp thickness, while T3 caused a significant increase in fruit T.S.S. in first season. Fruit acidity was not affected with all treatments in both seasons of study. T4 significantly increased V.C. content in both seasons of study. T2, T3 and T4 gave the highest concentration of N content in leaves in both seasons while T3 in first season and T2, T3 and T4 in second season gave a significant increase in P leaf content. All treatments increased leaf K content in both seasons of study. There was a significant increases in fruit nitrogen content with T3, T4 treatmenst due to application of biofertilizers in 2007 and 2008. While phosphorus and potassium contents were not affected with all treatments in both seasons of study.Application of the combination of N.P.K. and nitrobein improved production and fruit quality of seedy guava. So, we can recommend using biofertilizers with decreasing mineral nitrogen 50-75% to save costs and keep environment unpolluted.
 

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