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<p>This study aimed to analyze the effects of different zinc (Zn) sources on the nutrient content, yield, and quality of fruits in high-density apple orchards located within a&#xa0;sub-humid agro-climatic zone in the mid hills of Himachal Pradesh, India. Five-year-old apple trees (‘Var. Red Velox’) under high-density plantation (2.5 m × 1 m), irrigated through a&#xa0;drip irrigation system, were subjected to various Zn sources (nano-Zn, chelated-Zn, and zinc sulfate) applied at two different doses (single and double spray) one month after full bloom (Walnut stage) and again after 15&#xa0;days. The use of different Zn sources aims to identify the most effective form for enhancing apple yield and quality. Double doses of nano Zn emerged as the most effective source, promoting increased fruit weight (235 g), higher fruit Zn content (16 ppm), and higher fruit yield (78.3 t&#xa0;ha⁻<sup>1</sup>) compared to chelated (160.4 g, 12 ppm, and 76.8 t&#xa0;ha⁻<sup>1</sup>) and sulfate (166.9 g, 11 ppm, and 76.5 t&#xa0;ha⁻<sup>1</sup>) forms. Zn-treated apples exhibited higher firmness, increased total soluble solids (TSS) content, and reduced titratable acidity, resulting in an elevated TSS:acid ratio. The findings suggest the potential of Zn, particularly in nano form, as a&#xa0;valuable tool for optimizing apple orchard management. While a&#xa0;double dose proved to be most effective, a&#xa0;single dose also showed promising results, closely following the performance of the double dose in improving yield and enhancing fruit quality.</p>

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Apple Yield and Quality Response to Zinc Foliar Sources in High-Density Plantations

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • S. Ananthakrishnan,
  • J. C. Sharma,
  • Nitin Sharma,
  • F. Lalkhumliana,
  • Kapil Sharma,
  • A. Aravinthkumar,
  • S. Vishnu Shankar

摘要

This study aimed to analyze the effects of different zinc (Zn) sources on the nutrient content, yield, and quality of fruits in high-density apple orchards located within a sub-humid agro-climatic zone in the mid hills of Himachal Pradesh, India. Five-year-old apple trees (‘Var. Red Velox’) under high-density plantation (2.5 m × 1 m), irrigated through a drip irrigation system, were subjected to various Zn sources (nano-Zn, chelated-Zn, and zinc sulfate) applied at two different doses (single and double spray) one month after full bloom (Walnut stage) and again after 15 days. The use of different Zn sources aims to identify the most effective form for enhancing apple yield and quality. Double doses of nano Zn emerged as the most effective source, promoting increased fruit weight (235 g), higher fruit Zn content (16 ppm), and higher fruit yield (78.3 t ha⁻1) compared to chelated (160.4 g, 12 ppm, and 76.8 t ha⁻1) and sulfate (166.9 g, 11 ppm, and 76.5 t ha⁻1) forms. Zn-treated apples exhibited higher firmness, increased total soluble solids (TSS) content, and reduced titratable acidity, resulting in an elevated TSS:acid ratio. The findings suggest the potential of Zn, particularly in nano form, as a valuable tool for optimizing apple orchard management. While a double dose proved to be most effective, a single dose also showed promising results, closely following the performance of the double dose in improving yield and enhancing fruit quality.