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ThesisItem Embargo Effect of foliar application of iron and molybdenum on horticultural traits and nutrient uptake in guava (Psidium guajava L.)(Punjab Agricultural University, Ludhiana, 2022) Amit Kumar; Khokhar, YogeshThe present investigation was carried out to study the effect of supplemental foliar application of Iron and Molybdenum sources on horticultural traits of winter season fruits and nutrient uptake in guava cv. Shweta (Psidium guajava L.) trees. X years old trees were sprayed once and twice with ferrous sulphate (0.3%, 0.4% and 0.5%), single spray of ammonium molybdate and sodium molybdate each at 0.05 %, 0.10 % and 0.15 % concentration during middle of August and September. The results revealed that greater vegetative shoot extension (33.74 cm), leaf area (81.3 cm2 ), fruit set (62.7 %), fruit retention (67.3 %) were recorded with single spray of ferrous sulphate @ 0.5 % which were at par with 0.10 % ammonium molybdate spray. Similarly, fruit physical parameters such as fruit weight (204.9 g), fruit size i.e. fruit length (7.9 cm) and fruit breadth (7.5 cm) and yield (29.6 kg) were recorded significantly higher in single spray of ferrous sulphate treatment. Likewise, in the same treatment biochemical characteristics viz. total soluble solids content (TSS), vitamin C and proline also recorded maximum which were at par with foliar application of 0.10 % ammonium molybdate. Foliar application of ferrous sulphate @ 0.5 % twice exhibited significant improvement in fruit colour as compared to other treatments. However, pectin content was not affected by ferrous sulphate as well as molybdenum sprays. Foliar N, P, K and Zn, Fe, Mn, Cu, Mo contents also improved with foliar sprays of ferrous sulphate and ammonium molybdate over control. In conclusion, the application of single spray of 0.5 % ferrous sulphate has a potential to improve vegetative growth, fruit yield and quality of guava.
