STUDIES ON THE FOLIAR APPLICATION OF ZINC AND BORON IN GUAVA (PSIDIUM GUAJAVA. L) C.V. ALLAHABAD SAFEDA

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Date
2000
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Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
The present investigation "Studies on the foliar application of Zinc and Boron in Guava (Psidium guajava L.) cv. Allahabad Safeda was carried out at Regional Horticulture Research Station, Udheywala, Jammu during 1998 on nine year old trees of uniform size and vigour on guava cv. Allahabad Safeda. The experiment was laid out in randomised block design with different concentrations of Zinc sulphate and Boric acid either singly or in combination to determine the effect of foliar sprays of various concentrations of these nutrients on yield and quality of fruit. Three sprays were conducted at monthly intervals, starting from fifteen days before flowering. Yield of guava fruit was significantly increased by the foliar application of Zinc sulphate and Boric acid, registering a maximum yield of 53.02 kg/tree as compared to control (32.27 kg). Zinc sulphate (0.3 %) + Boric acid (0.3 %) in combination have proved most beneficial in increasing yield. Significant increase in physical characters of guava fruit viz. fruit length, diameter, weight and specific gravity was achieved by the foliar sprays of Zinc sulphate (0.3 % and 0.4 %) and Boric acid (0.2 % and 0.3 %) as compared to control. Highest fruit length, diameter, weight and specific gravity was recorded by Zinc sulphate (0.3 %) + Boric acid (0.3 %) combination. The chemical composition of fruit also improved. There was an increase in TSS, total sugars, ascorbic, acid and decrease in acidity in fruits treated with Zinc sulphate (0.3 %) + Boric acid (0.3 %). Highest cost benefit ratio of 1:2.80 was obtained with Zinc sulphate (0.3 %) + Boric acid (0.3 %) combination. The present studies thus revealed that for obtaining better quality and maximum yield in guava combination of Zinc sulphate (0.3 %) + Boric acid (0.3 %) may be sprayed at monthly intervals staring from fifteen days before flowering.
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