Comparison of Different Foliar-Fertilization Strategies on Yield, Fruit Size and Quality of 'Nules' Clementine Mandarin

Zheng, Yongqiang; Khuong, Trinh Quang; Lovatt, Carol J.; Faber, Ben

doi:10.17660/actahortic.2013.984.28

Cited by 2 publications

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“…Whereas potassium has long been known to increase fruit size of citrus cultivars, including mandarin cultivars (Boman, 2002), multiple foliar sprays of water have been documented to reduce total yield and yield of commercially valuable size fruit of 'Nules' Clementine mandarin (Zheng et al, 2013). The interaction between these positive and negative effects might explain why the trees receiving three applications of potassium nitrate produced fewer commercially valuable size fruit than trees receiving a single application of urea winter prebloom, but not significantly fewer than the control trees.…”

Section: Foliar Treatmentmentioning

confidence: 99%

“…Foliar applications were compared with soilapplied phosphate to determine their capacity to increase fruit set and fruit size. The effects of these foliar fertilizer treatments on yield and fruit size have been published in part (Gonzalez et al, 2010;Zheng et al, 2013), but the data were not analyzed in the context of alternate bearing. Alternate bearing has been documented to influence results obtained with foliar-applied fertilizers; treatments increased yield in the on-crop year, which exacerbated the off-crop year of apple (Izadyar et al, 1998).…”

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confidence: 99%

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Properly Timing Foliar-applied Fertilizers Increases Efficacy: A Review and Update on Timing Foliar Nutrient Applications to Citrus and Avocado

Lovatt

2013

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Foliar fertilization efficiently meets the nutrient demand of tree fruit crops during periods when soil conditions (low or high temperatures, low or excess soil moisture, pH, salinity) render soil-applied fertilizers ineffective, when nutrients (e.g., phosphate, potassium, and trace elements) become fixed in the soil, and when tree nutrient demand is high. Applying nutrients directly to leaves ensures that the metabolic machinery of the tree is not compromised by low availability of an essential nutrient. It should be noted that phloem mobile nutrients applied to the foliage are translocated to all tree parts, even feeder roots. Because foliar application of fertilizers can reduce nutrient accumulation in soil, runoff water, surface water (streams, lakes, ocean), and groundwater (drinking water supply), where they contribute to salinity, eutrophication, or nitrate contamination, with negative consequences to the environment and humans, it is highly desirable to replace soil-applied fertilizers at least in part with foliar-applied fertilizers. However, not all nutrients are taken up through leaves and, even if taken up, some nutrients are not phloem mobile. In addition, although foliar fertilizer rates are typically lower than soil fertilizer rates, application can be more costly. The goal has been to time the application of foliar fertilizers to key stages of citrus (Citrus sp.) and avocado (Persea americana) tree phenology when demand for the nutrient is likely to be high and especially when soil conditions are likely to compromise nutrient uptake by roots. This approach has proven successful for increasing yield, fruit size, and grower income even when the tree is not nutrient deficient by standard leaf analysis. Winter prebloom foliar-applied low-biuret urea was previously documented to increase total yield of both navel and ‘Valencia’ oranges (Citrus sinensis). Adaptation of this treatment to ‘Nules’ Clementine mandarin (Citrus reticulata) increased the yield of commercially valuable size fruit in two experiments. Foliar application of boron or low-biuret urea to ‘Hass’ avocado trees at the “cauliflower” stage of inflorescence development increased total yield; potassium phosphite applied at this stage of tree phenology increased the yield of commercially valuable size fruit.

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Section: Foliar Treatmentmentioning

confidence: 99%

mentioning

confidence: 99%