scholarly journals Pruning Method Affects Lowbush Blueberry Yields

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 784C-784
Author(s):  
John M. Smagula ◽  
Scott Dunham
Keyword(s):  
Block Design ◽  
Leaf Tissue ◽  
Diammonium Phosphate ◽  
Nutrient Concentrations ◽  
Pruning Method ◽  
Lowbush Blueberry ◽  
Main Effect ◽  
Leaf Nutrient Concentrations ◽  
Leaf P

Flail mowing was compared to traditional pruning by oil fire over a 12-year period in two fertility experiments testing interactions with pruning method. In study one (1983–1986), urea at 0, 22.4, 44.8, 67.2, or 89.6 kg·ha–1 was applied preemergent in a split-block design with fertility as the main effect, and pruning method split within six blocks. Study two (1987–1994) continued the pruning and application of fertilizer on the treatment plots with similar rates, but diammonium phosphate (DAP) replaced urea as the fertilizer. Leaf tissue N concentrations were above the 1.6% standard and urea had no effect or decreased yield. There was no interaction of fertility and pruning and no effect of pruning method on yield. No interaction of fertility and pruning was found in study two, but DAP increased leaf P concentrations and yield and, after three cycles of mowing, yields had begun to decline in mowed plots compared to burned plots. No meaningful differences in leaf nutrient concentrations were found between plants in mowed and burned plots.

scholarly journals Lowbush Blueberry Response to Phosphorus-containing Fertilizers: Assessment by Leaf Phosphorus Concentration and Content

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 537D-537
Author(s):  
J.M. Smagula ◽  
S. Dunham
Keyword(s):  
Block Design ◽  
Leaf Tissue ◽  
Dry Weight ◽  
Nutrient Concentrations ◽  
Phosphorus Concentration ◽  
P Deficiency ◽  
Lowbush Blueberry ◽  
Phosphorus Containing ◽  
Leaf N Concentration ◽  
Leaf P

Lowbush blueberries (Vaccinium angustifolium Ait.) in three commercial fields were treated with 67.2 kg P/ha from triple super phosphate(TSP), monoammonium phosphate (MAP), or diammonium phosphate (DAP), and compared to a control in a randomized complete block design with 12 blocks. Correction of P deficiency by fertilizers with different ratios of P to N was assessed by leaf and stem nutrient concentrations and contents (concentration × weight). Samples of stems collected in July from three 0.03 m2 quadrates per treatment plot indicated MAP and DAP had no effect on dry weight of stem tissue, but increased average dry weight of leaf tissue. Leaf nutrient concentrations and contents showed similar results; P and N were raised to higher levels by MAP and DAP than by TSP. TSP had no effect on leaf N concentration or content but raised leaf P concentration but not content, compared to controls.

Lowbush Blueberry Response to Different Phosphorus/Nitrogen Ratios

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 529d-529
Author(s):  
J.M. Smagula ◽  
W. Litten ◽  
S. Dunham
Keyword(s):  
Block Design ◽  
Leaf Tissue ◽  
Dry Weight ◽  
Stem Length ◽  
Nutrient Concentrations ◽  
Flower Bud ◽  
P Deficiency ◽  
Lowbush Blueberry ◽  
Triple Super Phosphate ◽  
Leaf P

Lowbush blueberries (Vaccinium angustifolium Ait.) in three commercial fields were treated with 67.2 kg P/ha from triple super phosphate (TSP), monoammonium phosphate (MAP), or diammonium phosphate (DAP) and compared to a control in a randomized complete-block design with 12 blocks. Correction of P deficiency by fertilizers with different ratios of P to N was assessed by leaf nutrient concentrations. Samples of stems collected in July from three 0.03-m2 quadrats per treatment plot indicated MAP and DAP had no effect on dry weight of stem tissue, but increased average dry weight of leaf tissue. P and N Leaf concentrations were raised to higher levels by MAP and DAP than by TSP. TSP had no effect on leaf N concentrations but raised leaf P concentrations compared to controls. Stem length, flower buds per stem and flower bud density were increased by both MAP and DAP, but not TSP. MAP and DAP increased fruit yield by about 340 kg/ha compared to the control.

EFFECT OF METHOD AND DATE OF PRUNING ON SOIL ORGANIC MATTER AND LEAF NUTRIENT CONCENTRATIONS OF LOWBUSH BLUEBERRIES

1982 ◽  
Vol 62 (3) ◽  
pp. 813-817 ◽  
Author(s):  
ERIC J. HANSON ◽  
AMR. A. ISMAIL ◽  
ROLAND A. STRUCHTEMEYER
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Leaf Tissue ◽  
Growing Season ◽  
Nutrient Concentrations ◽  
Vaccinium Angustifolium ◽  
Tissue Samples ◽  
Lowbush Blueberry ◽  
Leaf Nutrient Concentrations

Lowbush blueberry (Vaccinium angustifolium Ait.) plants were pruned mechanically by flail mowing, or thermally by oil burning in the spring or fall. The pruning treatments had no effect on soil organic matter or pH. Leaf tissue samples taken from burned plants the first growing season after pruning were higher in N and P, but lower in Ca than leaf samples from mowed plants. Leaf tissue samples taken the second growing season following pruning were not influenced by treatments.

scholarly journals ESTIMATING FERTILIZER NEEDS FOR LOWBUSH BLUEBERRIES: LEAF OR SOIL SAMPLES?

HortScience ◽  
1992 ◽  
Vol 27 (11) ◽  
pp. 1159g-1159
Author(s):  
John M. Smagula
Keyword(s):  
Soil Samples ◽  
Nutrient Concentrations ◽  
Nutrient Elements ◽  
Average Depth ◽  
Lowbush Blueberry ◽  
Leaf Nutrient Concentrations ◽  
Leaf P ◽  
Leaf N

Concentrations of nutrient elements in randomly selected soil samples taken at a 3-inch depth or the depth of the surface organic pad correlated poorly (R2= < 0.34) with leaf nutrient concentrations randomly selected from the same fields. Average leaf N concentrations in 74 of 79 fields sampled were above the 1.6% standard, while leaf P was below the 0.125% standard in 62 of the 79 fields. Leaf K, Ca, and Mg concentrations were above the standards 0.400%, 0.270%, and 0.130%, respectively in all fields. The average depth of the organic pad was 2.23 cm, ranging from 0 to 10.16 cm. Seventy five percent of the fields had organic pads 0.127-2.54 cm thick and 20% greater than 2.54 cm. In an attempt to improve correlations, leaves within a 0.01M2 quadrat were sampled from 110 clones in 10 commercial blueberry fields and leaf nutrient concentrations compared with nutrient concentrations in 3-inch soil samples taken directly beneath the quadrat. The strongest correlation was between soil Mn and leaf Mn (r2= o.59). Leaf samples, although more expensive than soil samples, appear to be a better indicator of lowbush blueberry fertilizer requirements than soil samples.

scholarly journals Impact of Micronutrients and Sea Weed Sap on Nutrient Availability and Leaf Nutrient Concentrations of Mango (Mangifera indica L.) CV. Dashehari in Mollisols of Uttarakhand

2019 ◽  
pp. 1-10
Author(s):  
Ravina Pawar ◽  
A. K. Singh ◽  
K. P. Raverkar ◽  
Chiranjeev Kumawat ◽  
Johnson Lakra
Keyword(s):  
Nutrient Availability ◽  
Soil Nitrogen ◽  
Foliar Application ◽  
Mangifera Indica ◽  
Block Design ◽  
Nutrient Concentrations ◽  
Tropical Region ◽  
Randomized Block Design ◽  
Leaf Nutrient Concentrations ◽  
Nitrogen Phosphorus

An investigation was undertaken to study the effect of micronutrients and sea weed sap on nutrient availability and leaf nutrient concentrations of mango cv. Dashehari in the year 2014-2015. The experiment was conducted in a randomized block design with three replications and ten treatments consisting of various concentrations and combinations of micronutrients, sea weed sap along with recommended dose of fertilizers in sub-tropical region of GBPUA&T, Pantnagar, Uttarakhand, India. The highest available soil nitrogen, phosphorus, potassium (195.51, 74.30 & 218.79 kg ha-1), B, Zn, Fe, Cu and Mn (1.41, 0.85, 16.78, 3.21 and 25.50 ppm) after harvest were observed with the application of RDF + IIHR Mango Special @ 5 g/l (2 sprays at two months before flowering and marble stage). RDF + IIHR Mango Special also increased the nitrogen, phosphorus, potassium (1.88, 0.99, 0.83 %); B, Zn, Fe, Cu and Mn (18.17, 69.29, 199.49, 48.89 and 84.40 ppm) in leaves of mango cv. Dashehari. Foliar application of sea weed sap @ 10% (2 sprays at panicle emergence and marble stage) + RDF + ZnSO4 @ 200 g + CuSO4 @ 100 g + Boric acid @ 100 g (soil application) per plant in basin after harvest, also resulted in enhanced status of nutrients in plants and soil over various treatments followed to RDF + IIHR Mango Special @ 5 g/l foliar application.

Leaf Nutrient Concentrations and Dry Biomass of Fig Plants as Modified by the Application of NPK: A Preliminary Study

2021 ◽  
pp. 30-41
Author(s):  
Selenne Yuridia Márquez-Guerrero ◽  
Uriel Figueroa-Viramontes ◽  
Jorge A. Zegbe ◽  
Jesús Guadalupe Arreola-Ávila ◽  
José Antonio Cueto-Wong ◽  
...  
Keyword(s):  
Production Systems ◽  
Block Design ◽  
Nutrient Concentrations ◽  
Research Station ◽  
Stem Cuttings ◽  
Application Rates ◽  
Leaf Nutrient Concentrations ◽  
Dry Biomass ◽  
Four Blocks ◽  
Set Up

Aims: The effect of a complete NPK matrix on leaf nutrient concentrations and dry biomass of ‘Black Mission’ fig plant organs was tested under an intensive culture system and protected environment. Study Design: A randomized complete block design with four blocks was employed. Place and Duration of Study: The experiment was conducted from April to November 2016 at the Campo Experimental La Laguna, located in Matamoros, Coahuila, Mexico. This research station belongs to the Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP) of Mexico. The experiment was set up under a macro tunnel equipped with a shade mesh with 50% sunlight attenuation. Methodology: Two-year-old fig plants (cv. ‘Black Mission’) previously propagated from stem cuttings were used. There were three application rates each for N (0, 80, and 160 kg ha-1), P (0, 40 and 80 kg ha-1), and K (0, 80, and 160 kg ha-1) arranged in a balanced factorial matrix of 27 treatments. After harvest, leaf samples were collected to determine nutrient concentrations and they were split into roots, shoots, leaves, and fruit Results: The greatest total dry biomass was produced by the interaction of 80 kg ha-1 N and 40 kg ha-1 P and yielded the following leaf nutrient concentrations (mean ± SD): N 2.9 ± 0.3%, P 0.11 ± 0.01%, K 2.1 ± 0.4%, Ca 1.4 ± 0.7%, Mg 0.34 ± 0.03%, Fe 166.4 ± 49.5 mg kg-1, Cu 6.3 ± 1.7 mg kg-1, Mn 83.3 ± 20.9 mg kg-1, and Zn 22. 6 ± 3.8 mg kg-1. Application of 80 kg ha-1 N and 40 kg ha-1 P could be suggested for commercial fig production. Conclusion: Application of 80 kg ha-1 N and 40 kg ha-1 P could be tested under similar commercial production systems; however, the addition of supplemental K deserves further study.

scholarly journals Leaf Nutrient Levels for Pecans

HortScience ◽  
2006 ◽  
Vol 41 (5) ◽  
pp. 1339-1341 ◽  
Author(s):  
Andrew P. Pond ◽  
James L. Walworth ◽  
Michael W. Kilby ◽  
Richard D. Gibson ◽  
Robert E. Call ◽  
...  
Keyword(s):  
New Mexico ◽  
Leaf Tissue ◽  
Practical Method ◽  
Carya Illinoinensis ◽  
Nutrient Concentrations ◽  
Index Method ◽  
Leaf Nutrient Concentrations ◽  
Desert Southwest ◽  
Tree Leaf ◽  
Balance Index

Measurement of nutrients in leaf tissue is a practical method of monitoring the nutritional status of perennial crops such as pecan (Carya illinoinensis, Wang. C. Koch). Accurate interpretations require known standard concentrations for the crop and region. To determine standard concentrations for pecans, focusing on those grown in the desert southwest, we conducted a survey of 135 `Western Schley' pecan trees in Arizona for 2 years. Leaf nutrient concentrations and yield were collected for each tree. Leaf nutrient concentrations from the highest yielding trees (50th yield percentile) were used to calculate a mean and CV for each nutrient. Results were compared with data from New Mexico, Georgia, and Sonora, Mexico. Relatively large differences were noted in mean K, Ca, B, Cu, Fe, Mn, and Zn levels. Nutrient interpretation ranges were calculated based on Arizona population statistics using the balance index method.

Optimum leaf nutrient concentrations of wild lowbush blueberry in Quebec

2009 ◽  
Vol 89 (2) ◽  
pp. 341-347 ◽  
Author(s):  
Jean Lafond
Keyword(s):  
Nutrient Concentrations ◽  
Boundary Line ◽  
Maritime Provinces ◽  
High Productivity ◽  
Edaphic Conditions ◽  
Lowbush Blueberry ◽  
Leaf Nutrient Concentrations ◽  
K Concentration ◽  
Growing Conditions ◽  
The Relationship

To evaluate the nutritional status of wild lowbush blueberry (Vaccinium angustifolium Ait.), optimum leaf nutrient concentrations were developed in earlier studies conducted in Canada's Maritime Provinces and in Maine. However, these concentrations have not been validated under the climatic and edaphic conditions of the Saguenay-Lac-Saint-Jean region of Quebec (Canada). These concentrations may not be necessarily correlated with the high productivity levels recorded in this region in recent years. The objective of the study was therefore to determine the minimum and maximum blueberry leaf nutrient concentrations under the conditions characterizing this region. These concentrations were derived using the boundary-line approach, which involves estimating the relationship between maximum fruit yield and leaf concentrations of N, P, K, Ca and Mg. The data were obtained from N and P fertilization trials carried out between 2001 and 2006 in eight blueberry fields in the Saguenay-Lac-Saint-Jean region. On average, more than 80% of the samples analyzed met the minimum leaf nutrient concentrations. Minimum leaf N and Mg concentrations were comparable to those obtained in earlier studies. Minimum leaf concentrations were revised downward for P and Ca. Only minimum K concentration was higher compared with published standards. Maximum leaf concentrations were revised downward for all nutrients. Minimum and maximum concentrations were 16.36–20.55, 1.19–1.66, 5.40–7.10, 2.93–3.88 and 1.34–1.81 mg g-1 for N, P, K, Ca and Mg respectively. These concentrations were used to establish sufficiency ranges suited to wild lowbush blueberry growing conditions in the Saguenay-Lac-Saint-Jean region. Key words: Vaccinium augustifolium Ait., nutritional standards, yield-nutrients relationship

scholarly journals Correcting Lowbush Blueberry Boron Deficiency with Soil or Foliar Application

HortScience ◽  
2000 ◽  
Vol 35 (5) ◽  
pp. 827D-828
Author(s):  
J.M. Smagula ◽  
W. Litten ◽  
S. Dunham
Keyword(s):  
Foliar Application ◽  
Block Design ◽  
Dilution Effect ◽  
Boron Deficiency ◽  
Fertilizer Treatment ◽  
Flower Bud ◽  
Potential Yield ◽  
P Deficiency ◽  
Lowbush Blueberry ◽  
Leaf P

In the acid podzol soils of Maine where most lowbush blueberries are grown, low availability of boron tends to keep foliar B concentration below the 24 ppm standard. To compare efficacy of soil and foliar boron application methods, 1.5 × 7.6-m treatment plots in a commer-cial lowbush blueberry field received soil-applied borate at 0, 1.1, 2.2, or 3.3 kg·ha-1 B with or without additional DAP (89 kg·ha-1 P) and ZnSO4 (3.3 kg·ha-1 Zn) or foliar-applied Solubor at 0, 0.24, 0.49, or 0.74 kg·ha-1 B with or without the additional DAP and Zn. These 16 treatments were replicated eight times in a randomized complete-block design. Leaf B concentrations were raised by all soil-applied borate treatments and by the 0.49 and 0.74 kg·ha-1 B foliar Solubor treatments, compared to the controls. When borate at 2.2 or 3.3 kg·ha-1 B was combined with DAP plus Zn a lower leaf B concentration was observed compared to B alone, possibly due to a dilution effect caused by an increase in DAP-induced growth. Leaf P deficiency (<0.125% P) was corrected when DAP and Zn were included in the fertilizer treatment. The greatest potential yield (flower buds/stem and flower bud density) was measured in treatment plots receiving a combination of DAP plus Zn and either borate at 2.2 kg·ha-1 B or Solubor at 0.74 kg·ha-1 B. With no additional treatments applied in 1999, leaf B concentrations were slightly higher in soil-treated and foliar-treated plots than in controls suggesting a small carryover from 1997-applied boron. Carryover may vary with rainfall.

scholarly journals Influence of Fertilizer Application Timing and Rate on Azalea Bloom

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 789B-789
Author(s):  
Julie Fulenwider* ◽  
David Creech
Keyword(s):  
Block Design ◽  
Fertilizer Application ◽  
Nutrient Concentrations ◽  
Application Timing ◽  
Fertilization Rates ◽  
Randomized Complete Block Design ◽  
Leaf Nutrient Concentrations ◽  
Bloom Date

General guidelines for the fertilization of azaleas in Southern landscapes often suggest applications be made after bloom. Early fertilizations are thought to encourage earlier blooms which are more likely to be damaged by spring freezes. Three years of data will be presented. Treatments include four fertilization rates, and various times of application from early (December-January) to late (March-April). Four to six varieties were evaluated (depending on the year of the study) in the SFA Ruby M. Mize Azalea Garden and in plantings on the Stephen F. Austin State Univ. campus. A randomized complete block design was utilized with three plants per replication. Influence of timing and rate of fertilizer application on bloom date and persistence. Influence of fertilizer treatments on leaf nutrient concentrations will be presented.

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