Nitrogen Fertilizer Influences Fruit Quality, Soil Nutrients and Cover Crops, Leaf Color and Nitrogen Content, Biennial Bearing and Cold Hardiness of ‘Golden Delicious’

2007 ◽  
Vol 30 (10) ◽  
pp. 1585-1604 ◽  
Author(s):  
John Thomas Raese ◽  
Stephen R. Drake ◽  
Eric A. Curry
Keyword(s):  
Nitrogen Content ◽  
Soil Nutrients ◽  
Fruit Quality ◽  
Nitrogen Fertilizer ◽  
Cover Crops ◽  
Cold Hardiness ◽  
Leaf Color ◽  
Biennial Bearing ◽  
Golden Delicious

scholarly journals Multiple season-long sprays of ethephon or NAA combined with calcium chloride on ‘Honeycrisp’ apples: I. Effect on bloom and fruit quality attributes

2019 ◽  
Vol 99 (4) ◽  
pp. 444-459
Author(s):  
John A. Cline
Keyword(s):  
Calcium Chloride ◽  
Fruit Quality ◽  
Quality Attributes ◽  
Naphthaleneacetic Acid ◽  
Fruit Firmness ◽  
Biennial Bearing ◽  
Fruit Drop ◽  
Fruit Maturity ◽  
Return Bloom ◽  
Honeycrisp Apples

‘Honeycrisp’ apple trees are highly prone to biennial bearing and predisposed to bitter pit. The hypothesis that tank mix sprays of ethephon (ETH), naphthaleneacetic acid (NAA), and 1-aminocyclopropane carboxylic acid (ACC) combined with calcium chloride (CaCl2) can mitigate these production problems was tested in a 3-yr study. Mature ‘Honeycrisp’ trees were treated with either three or six summer applications of 150 mg L−1 ETH or 5 mg L−1 NAA, all tank-mixed with and without CaCl2, or two or five applications of 150 mg L−1 ACC (without CaCl2). Treatments were applied at 10-d intervals and initiated between 21 and 26 June. All treatments had little effect on enhancing return bloom of ‘Honeycrisp’. NAA, ETH, and CaCl2 all influenced fruit maturity and quality at harvest to varying degrees and across years. Fruit treated with NAA were firmer compared with untreated fruit in 2 out of 3 yr, whereas overall, fruit treated with six sprays of ETH had lower fruit firmness and were more mature. NAA had less influence on fruit quality attributes at harvest than did ETH, and decreased pre-harvest fruit drop (PFD). PFD increased with ETH in 1 out of 2 yr, whereas ACC and NAA both decreased PFD in 1 out of 2 yr. Overall, ETH and NAA, with or without CaCl2, had significant but inconsistent effects on fruit quality and maturity, all dependent on the year and number of applications. Adding CaCl2 decreased fruit firmness in 2 out of 3 yr.

scholarly journals The effects of different autumn-seeded cover crops on subsequent irrigated corn response to nitrogen fertilizer

2010 ◽  
Vol 01 (03) ◽  
pp. 148-153
Author(s):  
Gholam Reza Mohammadi ◽  
Mohammad Eghbal Ghobadi
Keyword(s):  
Nitrogen Fertilizer ◽  
Cover Crops

scholarly journals Phenotypic Evaluation of a Hybrid Diploid Blueberry Population for Plant Development and Fruit Quality Traits

Agronomy ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1067
Author(s):  
Lisa J. Rowland ◽  
Elizabeth L. Ogden ◽  
Bryan T. Vinyard
Keyword(s):  
Fruit Quality ◽  
Plant Development ◽  
Cold Hardiness ◽  
Soluble Solids ◽  
Chilling Requirement ◽  
Quality Traits ◽  
Flower Bud ◽  
Phenotypic Data ◽  
Fruit Quality Traits ◽  
Highly Correlated

A diploid blueberry mapping population, used previously to map quantitative trait loci (QTL) for chilling requirement and cold hardiness, was evaluated for several plant development and fruit quality traits. Specifically, the population was phenotyped in a greenhouse for timing of various stages of flower bud, leaf bud and fruit development and for fruit quality traits including weight, diameter, color, scar, firmness, flavor and soluble solids. Phenotypic data was analyzed statistically by analysis of variance, correlation tests, to examine associations of traits, and heritability. Results indicated that the traits were segregating and most were distributed normally in the population. Many of the development traits were correlated, and timing of shoot expansion, early bloom and full bloom was also correlated with the previously evaluated trait of chilling requirement. Some correlations were found among the fruit quality traits as well. For example, weight was highly correlated with diameter, and subjectively measured firmness was moderately correlated with one of the objectively measured firmness traits. In addition, most of the traits showed significant variation across genotypes and across years, and most had moderate to high heritability. Therefore, we conclude that the diploid population should be useful for identifying QTL for many of these traits.

scholarly journals Seven-year orchard performance of eleven new apple cultivars from Holovousy in comparison with some commonly grown ones

2011 ◽  
Vol 33 (No. 4) ◽  
pp. 131-139 ◽  
Author(s):  
J. Blažek ◽  
J. Křelinová
Keyword(s):  
Early Summer ◽  
Trunk Diameter ◽  
Chemical Protection ◽  
Biennial Bearing ◽  
Fruit Samples ◽  
Golden Delicious ◽  
Apple Cultivars

 In an orchard trial that was established in the spring of 1999 on M 9 rootstock at the spacing of 4 × 1 m, eleven new apple cultivars bred in Holovousy (Angold, Julia, Nabella, Primadela, Produkta, Resista, Rubinstep, Rucla, Selena, Vysočina and Zuzana) were evaluated in comparison with three standard varieties (Gala, Golden Delicious and Jonagold) and another two with resistance to scab (Rosana and Topaz). In the first three years, the incidence of scab and mildew was evaluated under limited chemical protection. In 2000–2005 on each of 10 randomly selected trees of each cultivar, the time of flowering and optimum harvest ripening were recorded, flower set and fruit sets were rated, yield per tree and weight of 10 fruit samples were measured. Trunk diameter was measured between 2002 and 2005. The early summer apple Julia had the healthiest state and it was recommended for organic growing. Selena was the most precocious, the least vigorous and had the highest crop efficiency. The highest annual yields per tree were recorded with Produkta, but this cultivar had the highest proportion of trees with biennial bearing. Primadela achieved the highest cumulative yields, whereas Angold brought the largest fruits on average. With the obtained results, the evaluated cultivars were characterised by some important features or recommendations for growers.  

Alternative production systems to reduce nitrates in ground water

1987 ◽  
Vol 2 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Robert I. Papendick ◽  
Lloyd F. Elliott ◽  
James F. Power
Keyword(s):  
Ground Water ◽  
Nitrogen Fertilizer ◽  
Cover Crops ◽  
Production Systems ◽  
Root Zone ◽  
Conservation Tillage ◽  
Current Status ◽  
Water Protection ◽  
Fertilizer Use ◽  
Nitrate Concentrations

AbstractEvidence indicates a strong positive relationship between increases in nitrogen fertilizer use on cropland and nitrate concentrations in shallow ground water. This raises concern about the fate and efficiency of nitrogen fertilizer with current farming practices. Approximately 50 percent of the nitrogen fertilizer applied may be recovered by agronomic crops and 35 percent or less removed in the harvested grain of a crop such as corn. The residual nitrogen is subject to loss by several processes, one being leaching from the crop root zone. Alternative production systems that provide ground water protection must give attention to improved management of nitrogen fertilizer and to practices that minimize the need for nitrogen fertilizer and reduce soil nitrate concentrations. Most important in nitrogen fertilizer management is to more closely match nitrogen availability in the soil with crop needs and to avoid over-fertilization. Nitrogen fertilizer use can be reduced by alternate cropping of low and high nitrogen-demanding crops, use of legumes in the crop rotation to fix nitrogen, and proper use of manures, crop residues, and other organic wastes. Residual nitrates in soil can be reduced by use of cover crops, nitrogen-scavenging crops in the rotation, and alternating shallow and deep-rooted crops. Conservation tillage alone as used with many conventional cropping systems will probably not change the current status of nitrate leaching. Practices used by organic farmers should be carefully studied as possible approaches for ground water protection and adaptation into conservation tillage systems for conserving soil and water resources.

Sorghum — peanut crop sequences at Katherine, N.T.

1961 ◽  
Vol 1 (3) ◽  
pp. 144
Author(s):  
LJ Phillips ◽  
MJT Norman
Keyword(s):  
Nitrogen Content ◽  
Nitrogen Fertilizer ◽  
Grain Sorghum ◽  
Clay Loam ◽  
Fertilizer Nitrogen ◽  
Preceding Crop ◽  
Nitrogen Yield ◽  
Peanut Crop ◽  
Sorghum Grain ◽  
Crop Sequence

Between 1957-58 and 1960-61, a crop sequence experiment with grain sorghum and peanuts with and without nitrogen fertilizer was carried out on Tippera clay loam at Katherine, N.T. Neither crop was influenced by the crop grown two years before it. Peanuts showed no response to preceding crop or to nitrogen fertilizer. Sorghum grain yields were 77 per cent higher after peanuts than after sorghum, and sorghum stubble yields 56 per cent higher. Nitrogen fertilizer increased sorghum grain and stubble yield when the crop followed sorghum, but not when the crop followed peanuts. Nitrogen content of sorghum grain was higher after peanuts than after sorghum, and was also increased slightly by nitrogen fertilizer. Nitrogen yield of sorghum grain was almost twice as high in crops following peanuts than in crops following sorghum. Nitrogen fertilizer increased nitrogen yield of sorghum grain when the crop followed sorghum, but not when the crop followed peanuts.

An investigation into citrus fruit quality problems associated with nutrition in the Murrambidgee Irrigation Areas

1975 ◽  
Vol 15 (75) ◽  
pp. 570
Author(s):  
GI Moss ◽  
ML Higgins
Keyword(s):  
Citric Acid ◽  
Fruit Quality ◽  
Nitrogen Fertilizer ◽  
Citrus Fruit ◽  
Poncirus Trifoliata ◽  
High Acid ◽  
Highly Correlated ◽  
High Level ◽  
Phosphorus Levels

High juice acidity in Late Valencia oranges (on Poncirus trifoliata rootstock) was found to be a problem in the Murrumbidgee Irrigation Areas (M.I.A.). The problem was investigated by surveying 36 farms in 1971 and 20 farms in 1972. In 1971 about one third of farms produced fruit with citric acid levels above 1.4 per cent; in 1972 fruit from all farms were above this level. High acid levels were associated with excessive use of nitrogen fertilizer. Leaf analyses indicated that nitrogen and potassium levels were above the optimum, phosphorus levels were satisfactory in most cases. Magnesium levels were high-above 0.4 per cent in most instances associated with the high level of exchangeable Mg in the soils, and P. trifoliata rootstock tended to accumulate this element. Juice K and leaf Mg were highly correlated with juice acidity (r = 0.50** and r = 0.38*) and leaf Ca was correlated with the brixlacid ratio (r = 0.46*). Juice nitrogen was correlated with juice acidity.

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