Yield sustainability through micronutrient management in Guava

T Adak; K Kumar; A N Ganeshamurthy; G Pandey

doi:10.24154/jhs.v18i2.1860

Authors

T Adak ICAR- Central Institute for Subtropical Horticulture, Rehmankhera, Lucknow-226101, Uttar Pradesh, India Author https://orcid.org/0009-0009-1172-2395
K Kumar ICAR- Central Institute for Subtropical Horticulture, Lucknow - 226101, Uttar Pradesh, India Author
A N Ganeshamurthy ICAR-Indian Institute of Horticultural Research, Hessaraghatta Lake Post, Bengaluru, India Author https://orcid.org/0000-0001-5199-5333
G Pandey ICAR- Central Institute for Subtropical Horticulture, Lucknow - 226101, Uttar Pradesh, India Author

DOI:

https://doi.org/10.24154/jhs.v18i2.1860

Keywords:

Fruit pulp, guava, micronutrient, sustainability index, yield

Abstract

A field study conducted with soil and foliar application of ZnSO₄ and borax at different phenological stages of guava cv. Shewta in sandy loam soil, revealed that highest sustainable yield index (0.80) was recorded with two sprays of 0.4% ZnSO₄ + 0.2% borax during fruit growth at one month interval, followed by 0.63 with three sprays of 0.4% ZnSO₄ + 0.2% borax before flowering, fruit set and during fruit growth. Highest TSS (13.13°Brix), acidity (0.652%) and ascorbic acid (262.21 mg/100 g) was recorded in two sprays of 0.4% ZnSO₄ + 0.2% borax at fruit growth in one month interval. Significant differences in Zn and B content in guava fruit pulp was recorded. It was noted that Guava fruit pulp had Zn content of 13.7 mg kg^-1 in control tree fruits while 14.6 to 16.5 mg kg^-1 in treated trees. Moreover, guava fruit pulp enriched with B (14.3 to 17.3 mg kg^-1) in treated tree fruits as compared to 12.4 mg kg^-1 in control trees. Micronutrient contents in leaf tissues showed significant difference in Zn and B concentration, whereas, Fe, Mn and Cu contents were statistically non-significant. The index suggested for attaining the sustainability and to economize the nutrient application, technology package consisting of two sprays of 0.4% ZnSO₄ and 0.2% borax during fruit growth at one month interval should be adopted at growers’ field.

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