Seasonal Variation in Leaf Nutrient Concentration of Northern Highbush Blueberry Cultivars Grown in Conventional and Organic Production Systems

Strik, Bernadine C.; Vance, Andrew L.

doi:10.21273/hortsci.50.10.1453

Cited by 35 publications

(57 citation statements)

References 18 publications

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“…Consequently, the plants were slightly chlorotic that spring but recovered quickly once fertigation was initiated and one or two applications of urea were applied. Strik and Vance (2015) also reported low leaf P in various cultivars of northern highbush blueberry in western Oregon, but the concentrations measured in the present study in year 2 were below those reported previously for 'Duke' (Larco et al, 2013b;Strik and Vance, 2015). Phosphorus uptake is sometimes limited in fertigated plants because of the smaller size of the root system (Bryla, 2011).…”

Section: Resultscontrasting

confidence: 65%

“…Most of the leaf nutrient concentrations were within the recommended range for northern highbush blueberry in Oregon; however, leaf Mg, S, and Mn were above and leaf Cu was below recommendations in year 1, while leaf Fe was above and leaf N and P were below recommendations in year 2 . Low leaf Cu in not unusual when Cu-containing fungicides are omitted from the pest management program (Strik and Vance, 2015). Leaf Fe may have been high in year 2 because of dust on the leaves (not washed before analysis).…”

Section: Resultsmentioning

confidence: 99%

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Chemigation with Micronized Sulfur Rapidly Reduces Soil pH in a New Planting of Northern Highbush Blueberry

Almutairi

Machado

Bryla

et al. 2017

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Section: Resultscontrasting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Chemigation with Micronized Sulfur Rapidly Reduces Soil pH in a New Planting of Northern Highbush Blueberry

Almutairi

Machado

Bryla

et al. 2017

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“…The amendment-mulch treatments led to differences in soil pH, OM, and particularly levels of soil Ca, Mg, and K (Table 3). Despite these differences in soil properties, Strik and Vance (2015) noted no effect of amendment-mulch on leaf nutrient concentrations in this same research planting other than for manganese (Mn) and aluminum (Al) whose availability is decreased at high soil pH. Therefore, although compost supplied a high rate of total N (Table 1), and an estimated 25 kg · ha -1 N released per year of the study, it apparently supplied low amounts of plant-available N, or the added N was not required by the plants.…”

Section: Resultsmentioning

confidence: 99%

“…Larco et al (2013bLarco et al ( , 2014 also found that yard-debris compost provided little to no plant-available N when used as part of a mulching program in organic blueberry production. In our study, the nutrients applied via fertilization (Table 2) were thus considered sufficient for plant growth based on plant tissue analysis (Strik and Vance, 2015) and observed growth. The high pH in the organic amendment-mulch treatment, however, likely reduced plant growth and yield in some cultivars (see below).…”

Section: Resultsmentioning

confidence: 99%

Northern Highbush Blueberry Cultivars Differed in Yield and Fruit Quality in Two Organic Production Systems from Planting to Maturity

Strik

Vance

Finn

2017

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Northern highbush blueberry (Vaccinium corymbosum L.) cultivars were evaluated from planting (Oct. 2006) through 2014 in a certified organic research site in Aurora, OR. The treatments included cultivar (Duke, Bluecrop, Reka, Bluejay, Bluegold, Draper, Legacy, Liberty, Ozarkblue, and Aurora), amendment-mulch [“compost + sawdust” (included preplant amendment and a surface mulch of either an agricultural on-farm crop waste compost or yard-debris compost and sawdust), and “weed mat” (no preplant amendments but with a sawdust mulch topped with weed mat)]. Adding on-farm compost as a preplant amendment and as part of the mulching program increased soil pH from 4.9 to 6.9, organic matter content (OM), and calcium (Ca), magnesium (Mg), and potassium (K) levels compared with the weed mat treatment. The reduced plant growth and yield in some cultivars grown in the compost + sawdust treatment was likely due to the higher soil pH. ‘Bluegold’ and ‘Draper’ were among the cultivars with consistently high flower bud set (40% to 57%), whereas others had consistently low values (e.g., 22% to 45% in ‘Bluecrop’). The number of flowers per bud was affected only by cultivar. There was no effect of year or amendment-mulch treatment on percent fruit set which averaged 93% during the study; however, ‘Ozarkblue’ had a significantly lower fruit set (88%) than only ‘Aurora’ (96%). Berry weight was affected by year (plant age), cultivar, and amendment-mulch treatment. ‘Ozarkblue’ produced the largest berries. Type of amendment-mulch had little effect on berry weight, except in ‘Ozarkblue’, ‘Aurora’, and ‘Reka’ where plants grown with weed mat produced larger fruit than those grown with compost + sawdust. On average, ‘Bluejay’, ‘Draper’, and ‘Liberty’ fruit had the highest percent soluble solids (TSS) and ‘Ozarkblue’ the lowest. Fruit harvested from plants grown with weed mat were firmer than when compost + sawdust was used. ‘Draper’ fruit were much firmer than those of the other cultivars in all years of the study. The number of flower buds per plant multiplied by the number of flowers/bud and berry weight (cultivar specific) and average fruit set was a good predictor of yield in young plants. Yield per plant increased from the second through seventh growing seasons as plants matured in all cultivars except for ‘Duke’ which had the greatest yield in 2014. Cumulative yield was highest in ‘Legacy’ and lowest in ‘Bluejay’ and in ‘Draper’, which had relatively low yield when plants were young. Most cultivars had greater yield when grown with weed mat, whereas ‘Bluegold’ and ‘Liberty’ were unaffected by amendment-mulch treatment. Because weeds were managed in all plots, the cultivar response to amendment-mulch was likely a reflection of sensitivity to preplant amendment with on-farm compost and the resulting higher soil pH. It is possible that the cultivars differed in their adaptability to the various fertility regimes caused by the amendment-mulch treatments and fertilizers used in our study.

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“…These observations, combined with the low transpiration conditions preceding onset of drop, indicated similarities to other Ca deficiencies such as blossom end rot in tomato (Solanum lycopersicum L.) and bitter pit in apples (Malus pumila Miller) [5][6][7]. In Oregon, relative to other cultivars, 'Draper' showed low fruit Ca and high leaf Ca [8].…”

Section: Introductionmentioning

confidence: 74%

Foliar Calcium Corrects a Deficiency Causing Green Fruit Drop in ‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)

Gerbrandt

Mouritzen²,

Sweeney

2019

Agriculture

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‘Draper’ northern highbush blueberry (Vaccinium corymbosum L.) is a widely-planted mid-season cultivar with excellent fruit quality. Under the climatic conditions of Southwestern British Columbia, Canada, and Northwestern Washington, USA, it expresses a physiological disorder causing spontaneous green fruit drop (GFD) of up to half of the developing crop just prior to onset of the fruit coloring phenophase. Reduction of economic losses due to GFD required identification of the cause of this disorder and development of an agronomic solution that would reduce fruit drop. In 2014, two initial experiments were conducted to compare three foliar Ca products under a range of N fertilization rates. In 2015 and 2016, three locations were used in a first step to optimizing rates and timings of foliar Ca application. Initial experiments determined that higher N fertilization rates exacerbate GFD but that foliar Ca corrects the condition. Multi-site, multi-year trials identified key rates and timings for foliar Ca application to provide an agronomic solution for commercial growers. These trials identified an acute fruit Ca deficiency as the cause of GFD, and that foliar calcium applied frequently at high concentration from mid-bloom onward can be effective in reducing GFD, often to negligible levels. This condition has now been reported in several production regions around the world.

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Seasonal Variation in Leaf Nutrient Concentration of Northern Highbush Blueberry Cultivars Grown in Conventional and Organic Production Systems

Cited by 35 publications

References 18 publications

Chemigation with Micronized Sulfur Rapidly Reduces Soil pH in a New Planting of Northern Highbush Blueberry

Chemigation with Micronized Sulfur Rapidly Reduces Soil pH in a New Planting of Northern Highbush Blueberry

Northern Highbush Blueberry Cultivars Differed in Yield and Fruit Quality in Two Organic Production Systems from Planting to Maturity

Foliar Calcium Corrects a Deficiency Causing Green Fruit Drop in ‘Draper’ Highbush Blueberry (Vaccinium corymbosum L.)

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