Effects of Nitrogen, Potassium, and Irrigation on Yield and Quality of Lemon1,2

Koo, R. C. J.; Young, T. W.; Reese, Ronald Lane; Kesterson, J. W.

doi:10.21273/jashs.99.4.289

Cited by 21 publications

(7 citation statements)

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“…Increased citrus fruit size in response to higher irrigation levels has been observed by many workers (Erickson and Richards, 1955;Koo et al, 1974;Yagev, 1977). Reduction in soil moisture decreased fruit growth rate (Hilgeman, 1977;Lombard et al, 1965).…”

Section: Discussionmentioning

confidence: 63%

“…Microsprinklers, or spray jets, are small emitters that usually deliver 16 to 100 liters-hr 1 over an area of 2 to 7.5 m in diameter. The response of citrus to irrigation has been studied intensively, but studies mainly have been concerned with the effects of irrigation on fruit yield (Bielorai, 1978;Koo, 1985) and quality (Koo et al, 1974). Considerably lower yields were obtained from drip-irrigated trees than when the same amount of water was applied by microsprinklers (Bredell and Barnard, 1977).…”

mentioning

confidence: 99%

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Grapefruit Leaf and Fruit Growth in Response to Drip, Microsprinkler, and Overhead Sprinkler Irrigation

Zekri

Parsons

1989

J. Amer. Soc. Hort. Sci.

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Fruit and vegetative growth of 21-year-old grapefruit (Citrus paradisi Macf.) trees on well-drained sandy soil was studied in central Florida. Drip, microsprinkler, and overhead sprinkler irrigation was compared at two levels of irrigation (150 and 450 mm·year−1). Significant differences in leaf area, fruit size, fruit growth, new flush growth, and canopy area were found with different irrigation systems applying similar amounts of water. Growth was improved by irrigation even in a year of high rainfall (1410 mm). With mature trees, drip systems promoted the least growth, while overhead sprinkler systems promoted the most. Leaf fresh and dry weights and individual leaf areas in the overhead sprinkler treatments were 40% to 50% greater than in the drip or nonirrigated treatments, while specific leaf weight and leaf water content per unit dry weight were similar for all treatments. Final fruit size and tree canopy area were 9% to 20% greater in the overhead sprinkler treatments than in the corresponding drip or nonirrigated treatments. Responses to microsprinklers were generally intermediate between the overhead sprinkler and the drip treatments. Because of the low soil area coverage, applying water at the higher rate with the drip system did not improve growth as well as the overhead system at the lower rate. With mature grapefruit trees under central Florida conditions, systems providing greater soil area coverage gave better leaf and fruit growth than systems providing less soil coverage.

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Section: Discussionmentioning

confidence: 63%

mentioning

confidence: 99%

Grapefruit Leaf and Fruit Growth in Response to Drip, Microsprinkler, and Overhead Sprinkler Irrigation

Zekri

Parsons

1989

J. Amer. Soc. Hort. Sci.

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“…Moreover, high N increased the proportion of green fruit by 65%. These conditions occured to "Valencia" oranges which promoted the regreening process 15 and 16 who reported that excess nitrogen application enhanced vegetative tree growth in Citrus trees, which increased GA production and the inhibition of senescence and thus poor coloration of citrus fruits. 4 In addition, Ahmed 17 reported that the incidence of regreening was due to increased nitrogen assimilation or reduction in carbohydrate metabolism within the tissues of citrus varieties.…”

Section: Average Cumulative Leaf Nitrogen Contentmentioning

confidence: 99%

Influencing of Some Factors on Regreening of “Valencia” Orange Fruits

Farag¹

2014

APAR

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Many factors involved the regreening process of "Valencia" oranges under warm climate. Researchers focused on the difference between day and night temperatures in relation to the regreening process. This study paid a special attention to the branchbearing fruits whether its temperature or its nitrogen content before the regreening process till appearance of regreening. In addition, growth degree hours (GDH), which took into consideration the duration of effective temperature from sunrise to sunset considering the minimum degree as 13°C was also studied. Thus, the main objective of this study was to evaluate the role of the branch-bearing fruit temperature and nitrogen content on the regreening process during 2012 and 2013 seasons. The results proved that regreened "Valencia" fruits were growing on branches with greater nitrogen content, higher temperature and GDH. Furthermore, there were a high correlation between cumulative nitrogen content, temperature of branch-bearing fruits and GDH and the incidence of regreened "Valencia" oranges. Moreover, warm temperature throughout the season especially the period preceding harvest enhanced the uptake of nitrogen which reflected on more regreened "Valencia" oranges.

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“…High nitrogen application also decreases fruit color in grapes ( Kliewer, 1977 ). In Citrus , nitrogen is associated with an undesirable retardation of endogenous chlorophyll catabolism ( Koo et al, 1974 ) and postharvest treatments with ethylene may be required to accelerate the loss of the green color (de-greening).…”

Section: Effect Of Minerals On Colormentioning

confidence: 99%